598 results on '"Nondestructive tests"'
Search Results
2. Monitoring the New Jeremiah Morrow Bridge piers during construction : inferring displacements from tilt : Task 1 Structures Research Services : technical summary
- Author
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Helmicki, Arthur J. and Helmicki, Arthur J.
- Subjects
- Bridges Foundations and piers Testing. Ohio, Structural health monitoring Case studies. Ohio, Nondestructive testing Case studies. Ohio, Bridges Design and construction. Ohio, Surveillance de l'état des structures Études de cas. Ohio, Contrôle non destructif Études de cas., Bridges Design and construction., Bridges Foundations and piers Testing., Nondestructive testing., Structural health monitoring., Ohio.
- Abstract
Over several decades, the Ohio Department of Transportation (ODOT) has supported many projects aimed at investigating bridge behavior through instrumentation, nondestructive field testing, and structural modeling/identification. These projects have revealed the advantages of incorporating monitoring and testing in dealing with a wide variety of maintenance and management issues covering dozens of bridges of various types (e.g., steel girder, truss, concrete, stayed, etc.) throughout the state. The key feature of this approach is that it provides a solid, objective database of information that can be put to a variety of uses including: verification of design assumptions and analyses, monitoring of construction processes and methods, tracking of bridge responses at key locations for rating, support of inspection and maintenance practices, long term monitoring of structural behavior, etc. This article intends to focus upon one case study of a recently constructed, monumental bridge in southwest Ohio.
- Published
- 2024
3. Investigation of Existing Building Condition for Maintenance: Prolonging Its Service Life: The Case of CBE Bure Branch
- Author
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Tadesse, Habtamu A., Haile, Seto M., Shiferaw, Samuel D., Yihun, Tamirat S., Gualu, Alemayehu G., Kebede, Nakachew A., Woldegiorgis, Bereket Haile, editor, Mequanint, Kibret, editor, Getie, Muluken Zegeye, editor, Mulat, Eshetu Getahun, editor, and Alemayehu Assegie, Addisu, editor
- Published
- 2023
- Full Text
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4. Diagnostic Study of the Possibility of Damaged Sewn Sandwiches to Undergo a New Impact.
- Author
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Assouli, Amina, Tab, Bounoua, Hammadi, Fodil, Kheirikhah, Mohammad Mahdi, and Tafraoui, Ahmed
- Subjects
NONDESTRUCTIVE testing ,SANDWICH construction (Materials) ,VIBRATION tests ,POSSIBILITY ,SKIN temperature - Abstract
Over the past decades, sandwich structures have shown impressive performances in impact resistance and damage tolerance, which has allowed their innovations in various disciplines to flourish. The birth of sewn sandwiches has given, on the one hand, elements with structural cores that participate in the resistance to transverse shearing and, on the other hand, sandwich skins that contribute to resisting forces from the same direction to achieve an assembly, giving the structure an optimal lightness. After evaluating the behavior of said structure against impact stresses, in this study, it is proposed to start by evaluating the effect of damage caused by impacts of different energies. Then, their influence on the structure's mechanical properties and its ability to undergo one or more new impacts will be checked. For this, by using a microscope, diagnostic tests have been carried out for each sample after the first impact, followed by characterization by non-destructive tests based on vibration analysis in order to examine and compare the properties of a healthy plaque with those of the affected plaques. The tests are carried out on samples of dimensions 150 × 200 × (1.5 + 20 + 1.5 = 23) mm³. The results obtained by using the specialized software PULSE have encouraged a second series of effects on these samples. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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5. ADVANCED METHODS TO CHARACTERIZE THE STRUCTURAL MATERIALS OF RELIGIOUS BUILDINGS CONSTRUCTION.
- Author
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CHOUGRANI, Kaoutar, SCHIOPU, Adriana Gabriela, and CHOURAK, Mimoun
- Subjects
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BUILDING design & construction , *SCANNING electron microscopy , *X-ray diffraction , *CONSTRUCTION materials , *COMPRESSIVE strength - Abstract
The paper aims to present a bibliographic study of works on the characterization of materials, for mosques and historical minarets, using destructive methods (uniaxial compression, tension direct and indirect), and nondestructive testing (Schmidt rebound hardness, ultrasonic pulse velocity (UPV), scanning electron microscope (SEM) and X-ray diffraction (XRD) and their usefulness in the field of protection built cultural heritage. These religious buildings usually are constructed of brick masonry, stone, or/and reinforced cement concrete. Further, the form and amount of a structural defect is a function of the environment to which the structure is subjected. The different techniques used, for various construction materials, have determined the following parameters: the surface hardness, pulse velocity, structural composition, compressive strength, tensile strength and chemical composition. In general, these parameters govern the behavior under the different actions, and contribute to the strengthening and protection of the structure. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
6. Destructive and nondestructive tests formulation for concrete containing polyolefin fibers
- Author
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Saleh Ihab S., Mahdi Muthana Sh., and Ojaimi Mohammed F.
- Subjects
polyolefin fibers ,nondestructive tests ,flexural strength ,fiber-reinforced concrete ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Polyolefin fiber is a new type of fiber that was used in concrete to improve some of the poor properties of concrete including; tensile strength, ductility, and fracture energy. In this research, the contribution of Polyolefin fiber in improving the properties of hardened concrete was examined by adding polyolefin fibers to mix with different fiber content. The polypropylene fibers were added as a ratio of 0.5, 0.75, 1.0, 1.5, and 2% of concrete volume. Destructive and non-destructive tests were carried out: slump, compression, splitting, and bending, Schmidt Hammer, and ultrasonic pulse velocity tests. The results showed that, as the polyolefin fiber content increases, the workability of concrete reduces dramatically. The experimental findings demonstrate that the concrete tensile strength and ductility were improved by a small improvement in overall compressive strength. The results show that the compressive strength increased gradually with the increase in fiber content of up to 1.5%, and then, the compressive strength starts to decrease. However, the tensile strength increases continuously with the fiber content increasing. A good relationship was obtained between the destructive and nondestructive tests.
- Published
- 2022
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7. Quality Control of Frame Structures of Robotic Systems by Express Nondestructive Methods
- Author
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Beskopylny, Alexey, Meskhi, Besarion, Beskopylny, Nikita, Bezuglova, Margarita, Howlett, Robert J., Series Editor, Jain, Lakhmi C., Series Editor, Shamtsyan, Mark, editor, Pasetti, Marco, editor, and Beskopylny, Alexey, editor
- Published
- 2022
- Full Text
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8. Reliability of Nondestructive Tests on Damage Assessment of Mosul Museum Building after Liberation Events.
- Author
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Ahmed, Saddam M.
- Published
- 2023
9. Fatigue damage evolution and residual strength analysis of 3D5D braided composites using X-ray computed tomography, acoustic emission, and digital image correlation.
- Author
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Liu, Xiaodong, Ge, Jingran, Zhang, Diantang, and Liang, Jun
- Subjects
- *
COMPUTED tomography , *ACOUSTIC emission , *DIGITAL image correlation , *FATIGUE cracks , *BRAIDED structures , *PEARSON correlation (Statistics) - Abstract
• The damage evolution during fatigue tests and residual strength tests is characterized by AE, DIC, and Micro-CT. • The information recorded by different characterization instruments is classified and compared for verification. • Pearson correlation analysis of classified damage facilitates quantitative analysis of the residual strength evolution. The accumulation of fatigue damage leads to continuous degradation of the residual strength of three-dimensional braided composites, directly determining the fatigue life. However, the inability to continuously collect residual strength and multiple damage modes pose a challenge to study the residual strength degradation mechanisms of three-dimensional braided composites. In this work, digital image correlation and acoustic emission techniques are employed to assess the strain field and damage events of the specimens during the residual strength tests. X-ray computed tomography facilitates the visualization and quantification of the fatigue damage evolution in three-dimensional braided composites. Moreover, the "two-step" damage classification method is applied to isolate the damage mechanisms. The Pearson correlation analysis is preformed between the quantitative results of three non-destructive techniques and residual strength degradation of 3D braided composites. The integration of the outcomes provides a comprehensive depiction of the residual strength degradation mechanisms. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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10. Concrete Electrical Resistivity as a Durability and Service Life Parameter for Reinforced Concrete Structures
- Author
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Balestra, C. E. T., Reichert, T. A., Savaris, G., de Freitas, Vasco Peixoto, Series Editor, Costa, Aníbal, Series Editor, Delgado, João M. P. Q., Series Editor, and Delgado, J. M. P. Q., editor
- Published
- 2021
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11. Nondestructive Evaluation of T-1 Steel in the Sherman Minton Bridge
- Published
- 2024
12. Development of Reference Specimens for Laboratory Testing
- Published
- 2024
13. Using the Portable XRF To Identify/Verify Field Material Properties [Technical Summary]
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- 2024
14. Using the Portable XRF To Identify/Verify Field Material Properties
- Published
- 2024
15. Implementation of Phased Array Ultrasonic Testing (PAUT) For Bridge Welds
- Published
- 2024
16. Assessment of a Medieval Arch Bridge Resorting to Non-destructive Techniques and Numerical Tools
- Author
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Oliveira, Daniel V., Allahvirdizadeh, Reza, Sánchez, Ana, Riveiro, Belen, Mendes, Nuno, Silva, Rui A., Fernandes, Francisco M., Correia, José A. F. O., Series Editor, De Jesus, Abílio M. P., Series Editor, Ayatollahi, Majid Reza, Advisory Editor, Berto, Filippo, Advisory Editor, Fernández-Canteli, Alfonso, Advisory Editor, Hebdon, Matthew, Advisory Editor, Kotousov, Andrei, Advisory Editor, Lesiuk, Grzegorz, Advisory Editor, Murakami, Yukitaka, Advisory Editor, Carvalho, Hermes, Advisory Editor, Zhu, Shun-Peng, Advisory Editor, Arêde, António, editor, and Costa, Cristina, editor
- Published
- 2020
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17. Development of a Structural Health Monitoring Tool for Underwater Concrete Structures.
- Author
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Pushpakumara, B. H. J. and Thusitha, G. A.
- Subjects
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SUBMERGED structures , *ULTRASONIC testing , *ANALYTIC hierarchy process , *HYDRAULIC structures , *STRUCTURAL health monitoring , *NONDESTRUCTIVE testing , *INSPECTION & review - Abstract
Limited studies have gathered information on structural health monitoring (SHM) of underwater structures, and most of those studies are outdated. The existing methods evaluated structural distresses separately, without accounting for the correlation between the distresses. This study developed a SHM tool which accounts for the reciprocal relationships and priority weights of different structural distresses, and assessed underwater structures using the developed structural health monitoring tool. A new rating method was developed using fuzzy analytic hierarchy process (FAHP) which incorporates visual inspections of surface distresses, nondestructive tests (NDTs), crack details, hydraulic conditions, and casual characteristics of the underwater structures. The SHM tool was applied to 12 underwater structures, including bridges, dams, canals, water tanks and quay walls. The results of NDTs such as rebound hammer tests and ultrasonic pulse velocity tests, crack surveys, and visual observations on underwater concrete structures are employed in the SHM tool and the structures were rated using priority weights allocated to different attributes. The SHM tool developed in this study supports enhanced efficiency and effectiveness of structural health monitoring of underwater structures and proposes a numerical framework which can be employed to rate and compare the structural health of different underwater concrete structures. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
18. Computer Vision for Sensed Images Approach in Extremely Harsh Environments: Blast Furnace Chute Wear Characterization.
- Author
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Lay-Ekuakille, Aime, Ugwiri, Moise Avoci, Okitadiowo, John Djungha, Chiffi, Cosimo, and Pietrosanto, Antonio
- Abstract
Measurements and characterization for extremely harsh environments require accurate approach especially by means of image-based computer vision. Because of harsh conditions, such as high temperature, pollution, turbulences, radioactive exposure, high energy, direct measurements through conventional sensors are not easy even with recent sensing technologies. Live and/or shortest time-delayed sensing, by means of imaging, can come to help to overcome the aforementioned constraints. The paper outilines the use of sensed images for characterizing the effects of high temperatures, at the inlet of a blast furnace, during the discharge of materials using a chute. This latter is subject to wear due to chemico-physical reactions at around 350-450 °C. Given the specific application related to the harsh environment, two algorithms are comparatively proposed and updated for the purposes of the paper; they are based both on computer vision, namely monadic technique and conventional neural network. For the first technique, virtual sensors have been introduced within the image thanks to sinogram and backprojection subtechniques. The results highlight the effects of the environment on the layers of anti-wear compounds applied on the chute, then they permit to understand the chute life-cycle. Quantitative percentage of material detection has been included as well as specific metrics for machine learning expression. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
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19. Evaluation of Elastic Properties of Fiber-Reinforced Concrete Using Fundamental Resonance Frequencies.
- Author
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Hedjazi, Saman and Castillo, Daniel
- Subjects
ELASTICITY ,FIBER-reinforced concrete ,MODULUS of rigidity ,NYLON fibers ,MODULUS of elasticity ,ELASTIC modulus - Abstract
This paper determines the effect of steel, glass, and nylon fibers on the elastic modulus of concrete. The effect of different fiber volume fractions (0.1, 0.25, 0.5, 0.75, 1, and 1.5% vol.) and water-cement ratios (w/c: 0.32 to 0.6) on the elastic properties of concrete was investigated using the fundamental resonant frequencies. Experiments were carried out on more than 100 standard cylindrical specimens. The experimental values were determined using resonance frequencies and compared to the available empirical equations in the literature and those of ACI 318 and ACI 363. The dynamic elastic modulus of concrete in the longitudinal and transverse directions were determined experimentally using the resonance test gauge (RTG). Moreover, the dynamic modulus of rigidity of concrete was also determined using the RTG. The results show that the modulus of elasticity of fiber-reinforced concrete (FRC) with a coarse-to-fine aggregate ratio (C/S) less than 1 decreases with the addition of fibers. A new equation to better evaluate the elastic modulus of FRC within the range of 0.1 to 1.5% of fiber volume fraction is proposed. The proposed equation shows good agreement with experimental results. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
20. Evaluation of Elastic Anisotropic Relations for Plain Concrete Using Ultrasound and Impact Acoustic Tests.
- Author
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Haach, Vladimir Guilherme, Carrazedo, Ricardo, Ribeiro, Paula de Oliveira, Ferreira, Luiz Paulo Alves, and Abe, Izadora Pivotto
- Subjects
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ULTRASONIC testing , *CONCRETE , *CONCRETE mixing , *ELASTIC constants , *MATERIALS analysis - Abstract
Concrete is considered an isotropic material for structural analysis and design purposes. However, during concrete placement and compaction, segregation and bleeding may occur. A water film is deposited around larger aggregate particles, especially on the bottom surface. This effect was already identified in the literature as a cause of anisotropy in compression strength, but there is no evidence of anisotropy of concrete in terms of elastic constants. In this paper, impact acoustics and ultrasound measurements were used to measure dynamic elastic properties in prismatic specimens (125×125×400 mm). The specimens were produced with two directions of concrete placement and compaction: longitudinal and transversal. Three concrete batches were produced with high, medium, and low percentages of cement. Five identical specimens were produced for each combination of concrete mix and direction of concrete placement. A pattern of anisotropy was identified for all specimens through natural frequencies of the specimens and measured ultrasonic wave velocities. Although this effect is small, it could be clearly identified by impact acoustics and ultrasonic tests. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
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21. Applying multiparametric ultrasonic nondestructive test for structural characterization of age hardened aluminum alloy.
- Author
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Cerqueira das Neves, Erick, Costa e. Silva, Ivan, Braz Medeiros, Jorge Luis, Volcanoglo Biehl, Luciano, and Damas Martins, Carlos Otávio
- Subjects
- *
ULTRASONIC testing , *NONDESTRUCTIVE testing , *PRECIPITATION hardening , *ULTRASONIC waves , *QUALITY control , *ALUMINUM alloys - Abstract
Structural integrity is a major concern for both manufacturers and consumers, thus health monitoring is mandatory for a proper quality control. The use of more reliable and widespread techniques is urged. In this context, this work developed a nondestructive procedure for microstructural characterization of age-hardened aluminum alloys. By the combination of ultrasonic inspection parameters, we developed two highly sensitive methods of hardness evaluation. The results proved the versatility of ultrasonic waves for materials inspection and characterization, expanding the onsite evaluations range. [ABSTRACT FROM AUTHOR]
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- 2021
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22. 考虑附加质量与弹簧的弹性支承杆损伤识别研究.
- Author
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王宸 and 徐飞鸿
- Abstract
Copyright of Guangdong Architecture Civil Engineering is the property of Guangdong Architecture Civil Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2020
- Full Text
- View/download PDF
23. Novel LHC collimator materials: High-energy Hadron beam impact tests and nondestructive postirradiation examination.
- Author
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Gobbi, Giorgia, Bertarelli, Alessandro, Carra, Federico, Guardia-Valenzuela, Jorge, and Redaelli, Stefano
- Subjects
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NONDESTRUCTIVE testing , *IMPACT testing , *HADRONS , *THERMAL shock , *PROTON beams , *NANODIAMONDS , *COLLIMATORS - Abstract
The LHC collimation system must adopt materials with excellent thermal shock resistance, high electrical conductivity, geometrical stability, and radiation hardness. Two novel composites, Molybdenum–Carbide–Graphite and Copper–Diamond, are proposed for the LHC collimation upgrade. A postirradiation examination was performed to assess the status of the composites, tested under intense proton beam impacts at the CERN HiRadMat facility. Metrology measurements, computed tomography, and 3D topography allowed to evaluate the localized spallation induced by the beam. This article provides an overview of the thermophysical characterization of the two composites before irradiation and nondestructive postirradiation results. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
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24. Quantification of Effective Flow Resistivity for Parametric Assessment of Pervious Concrete by Using Ultrasonic Pulse Velocity Method
- Author
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Singh, Avishreshth (author), Biligiri, Krishna Prapoorna (author), Sampath, Prasanna Venkatesh (author), Singh, Avishreshth (author), Biligiri, Krishna Prapoorna (author), and Sampath, Prasanna Venkatesh (author)
- Abstract
The use of nondestructive ultrasonic pulse velocity (UPV) testing to assess the hardened properties of pervious concrete (PC) mixtures is an emerging research area. Further, UPV has been successfully used to determine the effective flow resistivity (EFR) of asphalt concrete and cement concrete pavements. However, no research studies have focused on understanding PC characteristics using EFR. Thus, the major objectives of this study were to assess the suitability of UPV testing for characterizing PC mixtures and to quantify their EFR, which is a measure of the material’s characteristic impedance and is dependent on the mix variables along with porosity. Thirty-six control and sand-modified PC mixtures were prepared with four aggregate gradations, and three levels each of water-to-cement (w/c) and aggregate-to-cement (a/c) ratios. Test results indicated that EFR was significantly dependent on the mix variables, with aggregate gradation being the most influential factor (six and eight times higher than w/c and a/c ratios, respectively). Lower EFR or higher sound absorption capacity was reported for PC with higher porosities. The sand-modified PC mixtures had higher EFR (by 4%–12%) than the control PC, and consequently lower sound absorption capacity, attributed to the presence of mortar that densified the mixes. Further, good-to-excellent correlations were obtained for various PC properties with UPV and EFR, which underscored the potential of UPV in characterizing PC. The major contribution of this research was the development of a simple, fast, and cost-effective approach, which can be suitably adopted as a quality-control test to determine PC mixture properties., Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public., Pavement Engineering
- Published
- 2023
- Full Text
- View/download PDF
25. Field Evaluation of Wireless Ultrasonic Thickness Measurement with Steel Bridge Members
- Published
- 2023
26. Field Implementation of Concrete Strength Sensor To Determine Optimal Traffic Opening Time
- Published
- 2023
27. Public Roads Vol. 87 No. 3
- Published
- 2023
28. Life-Cycle Cost Implications of Alternative Bridge Inspection Planning
- Published
- 2023
29. Life-Cycle Cost Implications of Alternative Bridge Inspection Planning [Research Brief]
- Published
- 2023
30. A Deep Learning Based Non-Destructive Method for Estimating Concrete Strength using Continuous Wavelet Transform of Vibration Signals Acquired using A Smartphone's Accelerometer
- Author
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Dr. Saleh J. Alghamdi
- Subjects
Concrete ,Compressive Strength ,Deep Learning ,Nondestructive Tests - Abstract
Most non-destructive tests of concrete require sophis-ticated equipment and training; in this work we aim to develop a simple method to estimate the strength class of cylindrical con-crete samples based on vibrations signals that are collected after striking a concrete cylinder with a hammer. The vibration signals were collected by attaching a smartphone to the concrete cylinder and logging the vibrations registered via the smartphone’s built-in accelerometer. The acquired 1-D vibration signals are trans-formed to 2-D scalograms using continuous wavelet transform. Scalograms are then used to train a deep learningmodel to predict the strength class. Preliminary findings show that the model is capable of classifying the strength of concrete to low, high, or me-dium. The developed model achieved a high accuracy of 91.67%. The promising results of this work shed light into the future of smartphone-based measurements of construction materials’ properties.
- Published
- 2023
31. An Experimental Study on Mechanical Properties of Concrete using Nano Silica
- Author
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Dhanush Kalal and Aiwant Chandaliya
- Subjects
Durability ,Compressive Strength ,Nano Silica, Split Tensile Strength ,Nondestructive tests - Abstract
The Durability of Concrete has been vital to all the manufacturer and researchers. The Concrete has been on top always in providing Strength and durability of structures. On other side, we have been facing many challenges like long term Poor Performance, less durable, poor performance against acid and sulphate attack etc. Many researchers are working to improve these drawbacks using nano particles. Nano technology is one of the emerging techniques to improve the mechanical properties of concrete as well as the performance of concrete. The modifications are required to sort out these problems in concrete mass. It has been seen that using nano particles material, the tensile strength, susceptibility to chemical attack, corrosion of reinforcement, low durability has been sorted out up to a good extent. In this study, I have tried to improve mechanical and chemical properties of concrete like Compressive strength, durability, resistive against corrosion, acid attack resistance, workability etc. using Nano Silica material. The target study is to get the best proportion of concrete ingredient added with nano silica and to get the best out come with that proportion in terms of better mechanical and Chemical Properties.
- Published
- 2023
- Full Text
- View/download PDF
32. 参数随机Lamb波频散特性的非嵌入式 多项式混沌方法.
- Author
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于保华, 胡小平, and 杨世锡
- Abstract
Copyright of Journal of Vibration Engineering is the property of Nanjing University of Aeronautics & Astronautics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
- Full Text
- View/download PDF
33. Development and validation of failure preventive tools for aeronautical applications.
- Author
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Duarte, D.X., Pereira, P., Gameiro, G., Almeida, I., Milharadas, M., Cordeiro, S., Vieira, R., Antunes, P.J., Ferreira, N.J., Viana, J.C., Nunes, N., Viegas, V., Infante, V., and Moleiro, F.
- Subjects
- *
PROPELLERS , *LANDING gear , *NONDESTRUCTIVE testing , *DYNAMIC balance (Mechanics) , *AIRCRAFT industry , *TESTING equipment - Abstract
Abstract In the competitive world of aircraft industry, the reduction of maintenance periods is a decisive factor when companies and arm forces are undergoing the procurement processes for the acquisition of their next fleets. Thus being, the investigation in the aeronautical sector today is focusing not only in the development of better and more reliable aircraft systems, but also in the development of techniques and tools that allow for the performance of the required maintenance tasks in faster and more optimized manners. This work arises within this field of investigation addressing the validation of innovative failure preventive equipment for the evaluation of the electromechanical impedance (EMI) response of aeronautical structures, and for the dynamic balancing of propellers of aircraft in the category of Normal, Utility, Aerobatic and Commuter. This work is divided into two parts, in which the first explores the accuracy and competitiveness of one alternative nondestructive test (NDT) equipment developed by Critical Materials S.A. in aeronautical applications, when compared to the classical NDT methods. This part ends with the assessment of the technique's capability to identify defects in one EPSILON TB-30 Nose Landing Gear of the Portuguese fleet which had been put out of service through a high-frequency eddy current inspection. The second part regards the development of a maintenance equipment for the dynamic balancing of propellers systems, specifically optimized for the dynamic balancing of the propeller of the Lycoming engine used in TB-30 aircraft of the Portuguese Air Force. This study ends by highlighting the gains achieved in the overall TB-30 maintenance costs with the use of the developed tool, by comparing the average time used for the process of balancing the Lycoming propeller, with and without the use of this tool. Highlights • The evaluation of the electromechanical impedance response of aeronautical structures was performed • The accuracy and competitiveness of one alternative nondestructive test equipment was explored • The validation of a failure preventive tool for aeronautical applications was carried out • The development and validation of an engine monitoring tool for the dynamic balancing of aircraft propellers was developed [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
34. Investigation of the swelling failure of lithium-ion battery packs at low temperatures using 2D/3D X-ray computed tomography.
- Author
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Chen, Chengcheng, Wei, Yong, Zhao, Zhenbo, Zou, Yabing, and Luo, Daojun
- Subjects
- *
COMPUTED tomography , *LOW temperatures , *LITHIUM-ion batteries , *MATERIALS at low temperatures , *TOMOGRAPHY , *X-rays - Abstract
Abstract We employed 2D/3D X-ray computed tomography in conjunction with microzone analysis to study the failure mechanisms of lithium-ion battery packs at low temperatures. A nondestructive X-ray computed tomography strategy confers the direct and comprehensive observation of the hard-swelling of lithium-ion battery packs at low temperatures. X-ray computed tomographic images indicate that severe wrinkles occur in the electrode components, thus shedding light on the evolution of the failure process, which provides a valid secondary analysis of the failure mechanisms without damaging the battery pack. Combined with the results of the microzone analysis, swelling failure can be attributed to the generation of Li dendrites, volume expansion and delamination of the active materials. These processes can be caused by the slow electrochemical kinetics of the active materials at low temperatures. Graphical abstract Image 1087 Highlights • 2D/3D X-ray computed tomography has been applied to studied failure of LIBs. • Nondestructive detection combined with micro-zone and component analysis is useful. • Research reveals that LIBs easily occur swelling failure at low temperature. • Reason of swelling failure of LIBs has been explored by various characterizations. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
35. KOCAELİ TARİHİ CAMİ ÖRNEKLERİ ÜZERİNDEN PLANLI KORUMA KAPSAMINDA HASARSIZ TEST UYGULAMALARI: ÇOBAN MUSTAFA PAŞA CAMİİ, FEVZİYE CAMİİ VE PERTEV PAŞA CAMİİ (1).
- Author
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KİSHALI, Emre, TÜRKMENOĞLU BAYRAKTAR, Neslihan, and ŞENER, Mehmet
- Abstract
Copyright of METU Journal of the Faculty of Architecture / Mimarlık Fakültesi Dergisi is the property of METU Journal of the Faculty of Architecture and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
- Full Text
- View/download PDF
36. Nondestructive analysis of corrosion in ageing hardened AA6351 aluminium alloys
- Author
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Erick Cerqueira das Neves, Ezer Guimarães do Nascimento, Daiana Guerra Sacilotto, Jane Zoppas Ferreira, Jorge Luis Braz Medeiros, Luciano Volcanoglo Biehl, Guilherme Vieira Braga Lemos, Carlos Otávio Damas Martins, and Diego Augusto de Jesus Pacheco
- Subjects
Artificial ageing ,Corrosion ,Corrosion behavior ,Materials characterization ,General Materials Science ,Lightweight materials ,Manufacturing process ,Condensed Matter Physics ,Nondestructive tests ,AA6351 ,Ultrasonic inspection ,Aluminum alloys - Abstract
Aluminum alloys have been chosen over other lightweight structural materials because of their advantages regarding strength, long-term durability, and low cost. Aluminum comes under the category of highly reactive metals, where an inherently stable oxide layer can protect against aggressive corrosive conditions. Therefore, this research investigated the application of the ultrasonic nondestructive technique for inspection and monitoring of corrosion behavior of AA6351 heat-treated aluminum alloys. The samples were artificial age hardened at five different conditions. The complementary engineering experiments for materials evaluation included hardness, X-ray diffraction and salt spray tests. Overall findings showed correlations between ultrasonic and destructive data representing a fast, versatile and reliable inspection technique. Furthermore, findings show a significant correlation (>99%), thus supporting the benefits of the multiparametric ultrasonic test for heat treatment inspection and quality control of lightweight structural materials.
- Published
- 2022
37. The Influence of the Welding Process on the Ultrasonic Inspection of 9%Ni Steel Pipe Circumferential Welded Joints
- Author
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João da Cruz Payão Filho, Elisa Kimus Dias Passos, Rodrigo Stohler Gonzaga, Daniel Drumond Santos, Vinicius Pereira Maia, and Diego Russo Juliano
- Subjects
nondestructive tests ,dissimilar weldments ,phased array ultrasonic tests ,attenuations ,computer simulations ,Technology ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Microscopy ,QH201-278.5 ,Descriptive and experimental mechanics ,QC120-168.85 - Abstract
This work aims to compare the ultrasonic inspection of 9%Ni steel joints welded with the Gas Metal Arc Welding (GMAW) process and Shielded Metal Arc Welding (SMAW) process. These are the two most widely used processes used to weld pipes for CO2 injection units for floating production storage and offloading (FPSO) in the Brazilian oil and gas industry. The SMAW equipment is simple and portable, which is convenient for the FPSO; however, the GMAW process has the advantage of welding with high productivity. In this study we performed a numerical simulation using the software CIVA, 11th version, to analyze the behavior of ultrasonic longitudinal wave beams through GMAW and SMAW dissimilar weld joints. Ultrasonic tests were performed on calibration blocks drawn from both welded joints to evaluate the simulation results. The results are discussed with regard to the microstructure of the weld metal via electron backscatter diffraction (EBSD) analyses. The SMAW process presented better inspection performance than the GMAW process in terms of attenuation and dispersion effects. Although the SMAW had a better outcome, for both processes the configuration of 16 active elements and a scanning angle of 48° resulted in an optimized inspection of the entire joint.
- Published
- 2020
- Full Text
- View/download PDF
38. Testing of concrete by rebound method: Leeb versus Schmidt hammers.
- Author
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Kovler, Konstantin, Wang, Fengzhe, and Muravin, Boris
- Published
- 2018
- Full Text
- View/download PDF
39. Cracks and welds detection approach in solar receiver tubes employing electromagnetic acoustic transducers.
- Author
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Gómez Muñoz, Carlos Quiterio, Arcos Jimenez, Alfredo, García Marquez, Fausto Pedro, Kogia, Maria, Cheng, Liang, Mohimi, Abbas, and Papaelias, Mayorkinos
- Subjects
ELECTROMAGNETIC devices ,ACOUSTIC transducers ,FRACTURE mechanics ,ENERGY consumption ,SOLAR power plants - Abstract
There is a significant rising in development of new concentrated solar plants due to global energy demands. Concentrated solar plant requires to improve the operational and maintainability in this industry. This article presents a new approach to identify defects in the solar receiver tubes and welds employing a simple electromagnetic acoustic transducer. The absorber tubes in normal working conditions must withstand high temperatures, which can cause the tubes to deteriorate in areas such as welding, or it can cause hot spots due to defects or corrosion. A proper predictive maintenance program for the absorber pipes is required to detect defects in the tubes at an early stage, reducing corrective maintenance costs and increasing the reliability, availability, and safety of the concentrated solar plant. This article presents a novel approach based on signal processing and pattern recognition for predictive maintenance employing electromagnetic acoustic transducers. Hilbert transform is used to obtain the envelope of the signal that is smoothed by wavelet transform. It reduces the probability of detecting false-positive alarms. The algorithm uses the distance of the sensors from the edges to perform a self-identification of signal events. The events are located using two possible ways of ultrasound propagation, forward and reverse, and the time of flight of each echo. The algorithm correlates the theoretical events with events found experimentally. These echoes could come from different paths due to the electromagnetic acoustic transducer that generates forward and reverse shear waves. The main novelty in this approach is that the detection and location of the defect is determined considering two echoes that come from the same defect, but they arrive at the sensor flowing by different paths. The results are obtained with a double validation by matching the echoes that meet certain conditions. It increases the accuracy of the inspection and reduces false alarms. The approach has been tested and validated in an experimental platform that simulates the concentrated solar plants. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
40. Ultrasonic tests in the evaluation of the stress level in concrete prisms based on the acoustoelasticity.
- Author
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Bompan, Karen F. and Haach, Vladimir G.
- Subjects
- *
CONCRETE , *ACOUSTOELASTICITY , *ULTRASONIC testing , *NONDESTRUCTIVE testing , *THEORY of wave motion - Abstract
The ultrasonic pulse velocity method is a nondestructive test commonly used for the determination of the elastic properties of materials and verification of non-homogeneities and damages in structural elements. Another application for the ultrasound is the measurement of the stress state in a material. However, the use of ultrasonic waves for the latter purpose has been poorly studied, mainly regarding application in concrete structures. This paper addresses the use of ultrasound for the evaluation of stresses in concrete structures. Uniaxial compression tests were performed on concrete prisms. During the tests, longitudinal and shear ultrasonic waves were emitted to specimens subjected to different compressive stress levels. The results showed the increase of compression stress leads to higher velocities of ultrasonic waves, which proved the acoustoelastic effect. Such behavior was not observed in longitudinal waves emitted perpendicularly to the direction of the stress application. The largest increase in velocity was observed for longitudinal waves propagating in the same direction of the load application (variations on the order of 1%). Acoustoelastic coefficients were determined for each tested prism, according to the change in the velocities of the ultrasonic waves. The present study contributed to the knowledge on the acoustoelastic behavior of the concrete elements and shows the potential of ultrasonic tests to evaluate the stress state in concrete structures. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
41. Seismic Damage Assessment of an 891 Years Old Historic Masonry Mosque.
- Author
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Karaton, Muhammet and Aksoy, Hüseyin Suha
- Subjects
- *
EARTHQUAKE damage , *MOSQUES , *PRESERVATION of architecture , *RETROFITTING of buildings , *NONDESTRUCTIVE testing - Abstract
Diyarbakir Grand Mosque is one of the oldest and the most significant mosques in the Islamic world and the Mesopotamia. The mosque was heavily damaged due to fire following an earthquake which was predicted 8 magnitude in 1114. It was rebuilt between 1117 and 1125. It is predicted that a great earthquake in the forthcoming years will be occurred in the region. Therefore, conservation and retrofitting works should execute for this 891 years old building. In this study, nonlinear seismic analyses of the main prayer hall of the mosque are performed and damage assessment of it due to a probable great earthquake is determined. Material properties of the mosque are defined by using nondestructive tests. Three level seismic acceleration data are produced by considering seismic characteristics of the region. Damage regions on the mosque are obtained under these earthquake loads. Suggestions about retrofitting of this significant historical mosque are recommended. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
42. Combination of the Physical and Ultrasonic Tests in Estimating the Uniaxial Compressive Strength and Young's Modulus of Intact Limestone Rocks.
- Author
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Aboutaleb, Shekoufeh, Bagherpour, Raheb, Behnia, Mahmoud, and Aghababaei, Mohsen
- Subjects
LIMESTONE ,ROCKS ,COMPRESSIVE strength ,REGRESSION analysis ,POROSITY - Abstract
Geo-mechanical parameters of intact rocks like uniaxial compressive strength (UCS) and young's modulus (E) have been essentially evaluated for many objects. These parameters are obtained by standard UCS tests that are destructive, expensive, and time-consuming task. By using nondestructive methods such as the ultrasonic or physical tests, the parameters can be indirectly predicted. Consequently, presentation of multiple linear regression equations between destructive and nondestructive parameters is proposed in this paper. In order to predict the UCS and E in terms of density ( ρ), porosity (n), primary wave velocity (V) and shear wave velocity (V), 482 rock samples' data of five sedimentary rock types (in range from limestone to marl) from five different dam sites (located in Asmari formation, southwest of Iran) were analyzed. After regression analysis of the test results, the best fit equations are selected-equations with four independent variables ( ρ, n, V, V) and high coefficients of determination (R) on levels of 0.91 for UCS and 0.88 for E. These equations are simple, practical, and accurate enough to apply. They also can be used in practice for prediction purposes with acceptable accuracy. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
43. Effects of temperature change on pavement performance evaluation using FWD
- Author
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Lopour, Pavel, Artagan, Salih Serkan, Sareea, Wisam Muwafaq Abdulkhale, Lopour, Pavel, Artagan, Salih Serkan, and Sareea, Wisam Muwafaq Abdulkhale
- Abstract
The thesis aims to study the effect of temperature on pavement deflections ) especially when changing temperature( by using a falling weight deflectometer (FWD) and its results. The temperatures were obtained by two methods 1) a special temperature acquisition system designed for this thesis (Arduino thermometer) and 2) by the thermometers attached as a part of FWD device. Data from both devices were studied. Several correlations between temperature and different layers of pavement structure, (i.e., air temperature, surface pavement temperature, and mid-depth asphalt pavement temperature) were studied. Also, the survey analyzed the temperature's behaviors on pavements layers up to depth 430 mm under the surface., Cílem práce bylo prostudovat vlivy změny teploty na hodnocení únosnosti vozovek (zejména vliv změny teploty) na použití rázového zařízení typu A - FWD a jeho výsledky. Teploty byly získány dvěma metodami 1) speciálně vyvinutým měřícím systémem pro účely diplomové práce (Arduino teploměrem) a 2) teploměry v zařízení FWD. Teplotní data získaná pomoci obou zařízení byla vyhodnocena. Bylo provedeno několik korelací mezi teplotou a různými vrstvami konstrukce vozovky (tj. teplota vzduchu, teplota povrchu vozovky a teplota střední hloubky asfaltových vrstev). V práci jsou dále analyzovány změny teplot vrstev vozovky až do hloubky 430 mm pod povrchem., Dopravní fakulta Jana Pernera, Uchazeč stručně seznámil komisi se svou diplomovou prací. Po prezentaci hlavních výsledků a závěrů diplomové práce zodpověděl dotazy vedoucího a připomínky oponenta diplomové práce (uvedeny v posudcích práce). V diskusi o diplomové práci stručně zodpověděl všechny dotazy členů komise., Dokončená práce s úspěšnou obhajobou
- Published
- 2022
44. Sample dimension effect on cement-stabilized sandy soil mechanical behavior
- Author
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Ferreira, José Wilson dos Santos, Casagrande, Michéle Dal Toé, and Teixeira, Raquel Souza
- Subjects
Dimension effect ,Unconfined compression strength ,Indirect tensile strength ,Soil-cement ,Nondestructive tests ,Ultrasonic testing - Abstract
Stabilized soil with cement has been a widely used solution in geotechnical projects and requires the molding of numerous specimens to investigate their properties in destructive tests, restraining the reuse for other analysis. Also, distinct sample dimension has been utilized in the research without taking this effect into account. Recognizing these needs, the height and diameter (H/D) ratio effect on cement-stabilized soil mechanical behavior was assessed in the present work. Using sandy soil, Unconfined Compression Strength (UCS), Indirect Tensile Strength (ITS) and Ultrasonic Pulse Velocity tests were performed varying the curing period (7 and 28 days), cement type (I and III) and content (6, 7, 8, 9 and 10%), based on conventional (127 x 100 mm) and reduced dimension (105 x 50 mm) specimens. All variables, individually and combined, affected the compression and tensile strengths of the mixtures, resulting in greater gains for the ones molded with type III cement in reduced dimension, at 28 days of curing. The dimension as an influential variable was statistically established using the variance analysis (ANOVA) at a significance level (α) of 0.05, in which reduced dimension showed an average superior resistance of 21.3%. Mixtures molded with H/D ≥ 2 demonstrated strong correlation (R2 = 0.93), pointing to the possibility of ITS prevision through the P-wave velocity nondestructive tests.
- Published
- 2022
45. Three-Dimensional Visualization and Presentation of Bridge Deck Condition Based on Multiple NDE Data.
- Author
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Jinyoung Kim, Gucunski, Nenad, Duong, Trung H., and Dinh, Kien
- Subjects
BRIDGE design & construction ,DELAMINATION of composite materials - Abstract
A method is developed for presentation of a concrete bridge deck condition assessed by multiple nondestructive evaluation (NDE) technologies using a three-dimensional (3D) visualization program. Four types of NDE data are merged and visualized in the program: (1) impact echo for mapping and describing the severity level of concrete delamination; (2) ultrasonic surface wave for concrete quality (elastic modulus) assessment; (3) electrical resistivity for estimating the corrosion rate of steel reinforcement; and (4) high-resolution imaging of a bridge deck surface for documenting signs of deterioration, previous repairs, and surface wear. The developed visualization platform integrates the four NDE data types and visualizes in a 3D space in a very intuitive way. As such, the program assists in understanding of the complex relationships of bridge deck conditions assessed by multiple NDE techniques. In addition, a correlation between external (surface cracks, wear, and previous repairs) and internal deterioration (delamination, concrete degradation, and corrosion) can be studied and visually identified utilizing the developed 3D visualization program. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
46. Determinación del módulo dinámico por ondas de esfuerzo en la madera de Acer saccharum Marshall y Thuja plicata L.
- Author
-
Sotomayor Castellanos, Javier Ramón and Villaseñor Aguilar, José María
- Abstract
The research goal was to assess the stress wave speed in the longitudinal and radial directions of Acer saccharum Marshall and Thuja plicata L. wood and weighting this parameter with the wood density, to determine the dynamic modulus of elasticity. For each species, 32 addoc wood specimens were prepared with an average moisture content of 11 % in which stress waves tests were realized. The experimental design consisted in normality and difference of means tests. The response variables were the wood density and for the longitudinal and tangential directions, the speed of the stress waves and the dynamic modulus. The wood species was considered the variation factor. The stress waves method allowed the dynamic characterization of A. saccharum and T. plicata wood. Significant statistical difference was found between the response variables. The density of A. saccharum wood is greater than the corresponding to T. plicata wood. In the longitudinal direction, the stress wave speed and dynamic modulus of A. saccharum wood are lower than the T. plicata ones. In the tangential direction, the stress wave speed of A. saccharum is bigger than the T. plicata wood. In contrast, the dynamic modulus is smaller. When compared to the tangential direction, the stress wave speed and dynamic modulus are bigger in the longitudinal direction for both species. [ABSTRACT FROM AUTHOR]
- Published
- 2017
47. Physical-mechanical behavior of concretes exposed to high temperatures and different cooling systems.
- Author
-
Ercolani, Germán, Ortega, Néstor F., Priano, Carla, and Señas, Lilia
- Subjects
- *
EFFECT of temperature on concrete , *COOLING systems , *FIREFIGHTING , *COMPRESSIVE strength , *DISSECTING microscopes - Abstract
Over their lifetime, concrete structures can suffer from different pathologies, one of them is exposure to high temperatures, which diminishes their load-bearing capacity. This study describes how different concrete types were exposed to high temperatures. To simulate fire extinction, where the temperature of the overheated concrete descends suddenly, different cooling systems were applied: slowly cooling in the open air and fast cooling by spraying different water volumes. Several physical-mechanical characteristics were analyzed such as compressive strength, splitting tensile strength, porosity, capillary suction, and carbonation depth. Ultrasound nondestructive tests were conducted to quantify deterioration. A petrographic study using a stereomicroscope and microscopy of polarization was performed on thin sections to evaluate aggregate composition and concrete characteristics, focusing on interface areas. Physical and mechanical properties were affected by the increase in temperature, with damage worsening through the appearance of cracks and microcracks when water is used as a cooling system. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
48. Damage analysis of concrete members containing expansive agent by mechanical and acoustic methods.
- Author
-
Xia, Qiang, Li, Hua, Lu, Anqun, Tian, Qian, and Liu, Jiaping
- Subjects
- *
CRACKING of concrete , *DEFORMATIONS (Mechanics) , *EXPANSION & contraction of concrete , *EXPANSIVE concrete , *MECHANICAL behavior of materials , *CONCRETE durability , *PREVENTION - Abstract
Shrinkage compensating concrete (SCC) and Self-stressing concrete (SSC) technique have been employed for reducing early-age cracking and leakage while the addition of expansive agent would have a negative impact on mechanical properties and durability. The objective of the current research was to quantitatively assess the damage development in cementitious materials with expansive agent by both the strength tests and nondestructive acoustic tests including ultrasonic measurements and acoustic emission (AE) tests. The damage degree was defined based on strength as well as ultrasonic properties and a significant linear relationship was observed between the damage degree and autogenous strains. AE parameters such as AE amplitude, AE counts and AE energy were related to AE activity of the cement-expansive agent system. Crack mode identification was performed based on the relationship between average frequency and RA value (rise time/amplitude). A decreasing ratio of tensile cracks and an increasing ratio of shear cracks were observed which could be an indication of aggravated damage inside the materials. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
49. Nondestructive assessment of corrosion of reinforcing bars through surface concrete cracks.
- Author
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Bossio, Antonio, Lignola, Gian Piero, Fabbrocino, Francesco, Monetta, Tullio, Prota, Andrea, Bellucci, Francesco, and Manfredi, Gaetano
- Subjects
- *
REINFORCED concrete corrosion , *CRACKING of concrete , *NONDESTRUCTIVE testing , *CRACK formation in solids , *EXPERIMENTAL architecture - Abstract
Degradation of reinforced concrete ( RC) structures is a serious safety problem affecting all industrialized countries, and the economical aspect of this problem cannot be neglected. One of the main reasons for the degradation of RC is the corrosion of steel reinforcing bars as a result of concrete cover cracking and reduction in bar cross section. As a consequence, the structural capacity of RC elements decreases progressively as degradation develops. Nondestructive testing and/or analytical formulation represent high-quality rapid methods for evaluating the corrosion penetration of bars and provide useful parameters for designing retrofits. This paper presents an additional tool that can be used to evaluate and assess the vulnerability of existing structures in terms of the determination of bar cross section lost. Using simple charts and formulas, this can be accomplished by calculating reinforcing bar cross section loss due to corrosion by measuring external crack widths in the concrete cover. Predictions were obtained by using two analytical models developed. These predictions have been satisfactorily compared with both the literature and new experimental results, as well as with previous empirical models available in the scientific literature. The experimental results were obtained by corroding real-scale concrete specimens reinforced with smooth and ribbed bars (according to old and modern building codes) using 3.5 wt% sodium chloride solution and an applied current. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
50. Characterization of mortars with iron ore tailings using destructive and nondestructive tests.
- Author
-
Carrasco, E.V.M., Magalhaes, M.D.C., Santos, W.J.D., Alves, R.C., and Mantilla, J.N.R.
- Subjects
- *
MORTAR , *IRON ores , *METAL tailings , *NONDESTRUCTIVE testing , *BUILDING design & construction , *ELASTIC modulus - Abstract
Although several researchers have been working on the mechanical and physical characterization of iron-ore tailings (IOT) in order to consider the possibility of using this material to replace natural aggregate in the preparation of mortars, they have not investigated the dynamic and static modulus of elasticity of IOT mortars yet. Therefore, the main goal of this study is to present an experimental investigation on the determination of the static and dynamic Young’s modulus of IOT mortars using destructive and non-destructive tests respectively. It is also presented the correlation between the IOT mortar static (E ci ) and dynamic (E) elasticity modulus. It is seen that 88% of the observed variation in the elasticity modulus is attributable to the approximate linear relationship between the dynamic and static values, a very impressive result. The results indicate that it is possible to obtain high-performance mortars to be used not only as rendering material but also as structural material in building construction. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
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