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368 results on '"Kanavaris, Fragkoulis"'

2. RILEM recommendation from TC 289-DCM: guideline for designing and operating long-term marine exposure sites

Author

Li, Kefei, Zeng, Junjie, Tang, Luping, Sørensen, Henrik Erndahl, Andrade, Carmen, Maddalena, Riccardo, Huang, Liming, Geng, Guoqing, Borges, Pedro Castro, Keserle, Gilberto Cidreira, Wang, Shengnian, Martirena-Hernández, Fernando, Kanavaris, Fragkoulis, Monteiro, André Valente, Kovler, Konstantin, Zhang, Peng, Bansal, Tushar, Visalakshi, Talakokula, and Torrent, Roberto

Published
2024
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31. Recommendations of RILEM TC 287-CCS: thermo-chemo-mechanical modelling of massive concrete structures towards cracking risk assessment

Author

Azenha, Miguel, Kanavaris, Fragkoulis, Schlicke, Dirk, Jędrzejewska, Agnieszka, Benboudjema, Farid, Honorio, Tulio, Šmilauer, Vít, Serra, Carlos, Forth, John, Riding, Kyle, Khadka, Binod, Sousa, Carlos, Briffaut, Matthieu, Lacarrière, Laurie, Koenders, Eduardus, Kanstad, Terje, Klausen, Anja, Torrenti, Jean-Michel, and Fairbairn, Eduardo M. R.

Published
2021
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32. A review of fracture propagation in concrete: fundamentals, experimental techniques, modelling and applications.

Author

Barbhuiya, Salim, Das, Bibhuti Bhusan, and Kanavaris, Fragkoulis

Subjects
CRACK propagation (Fracture mechanics), CONCRETE fractures, COMPUTED tomography, DIGITAL image correlation, CONCRETE fatigue, STRUCTURAL health monitoring, ULTRASONIC testing, CONTINUUM damage mechanics
Abstract

A comprehensive overview of fracture propagation in concrete, covering various aspects ranging from fundamentals to applications and future directions, is presented. The introduction presents an overview of fracture propagation in concrete, emphasising its importance in understanding the behaviour of concrete structures. The fundamentals of fracture propagation are then explored, including concrete as a composite material, crack initiation and propagation mechanisms, types of fractures and the factors that influence fracture propagation. Next, experimental techniques for studying fracture propagation are discussed, encompassing both destructive and non-destructive testing methods, such as acoustic emission, ultrasonic testing, digital image correlation and advanced imaging techniques like X-ray computed tomography and scanning electron microscopy. Modelling approaches, including continuum damage mechanics, the finite-element method, the discrete-element method, the lattice discrete particle model and hybrid models, for simulating and predicting fracture propagation behaviour are then reviewed. The applications of fracture propagation in concrete are highlighted, including structural health monitoring, design optimisation, failure analysis and repair and rehabilitation strategies. Research opportunities for further improvement are addressed. This article should serve as a valuable resource for researchers, engineers and professionals in the field, providing a comprehensive understanding of fracture propagation in concrete and guiding future research endeavours. [ABSTRACT FROM AUTHOR]

Published
2024
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35. Embodied Carbon Classification System for Concrete in the United States.

Author

Kanavaris, Fragkoulis, Munro, Matthew, and Montanari, Luca

Subjects
GREENHOUSE gases, HIGH strength concrete, PRECAST concrete construction, CONCRETE durability, CARBON sequestration, PRECAST concrete, CARBONACEOUS aerosols
Abstract

This article addresses the inconsistent use of terms like "low carbon" and "sustainable" in the concrete industry and highlights the need for a clear and consistent definition. To address this issue, an Embodied Carbon (EC) classification system for concrete has been developed. The system includes fixed EC rating bands labeled A through G, with A representing carbon neutral or carbon negative concrete. The system aims to promote the adoption of ambitious targets for reducing the carbon footprint of concrete. It is intended to be applicable to the wider Americas region and includes both metric and imperial units of measure. The article emphasizes the importance of establishing metrics for measuring and classifying the embodied carbon (EC) of concrete to develop pathways to net-zero emissions. The Universal Classification system is introduced as a tool to help stakeholders communicate, compare, and set targets for the EC of concrete products. It can also inform market transformation policies and funding for research and development into lower-carbon concrete technologies. The article highlights the need for regional variations in the classification system to account for local practices and material availability. [Extracted from the article]

Published
2024

38. Influence of Aggregate Type on the Properties on SCC with Fly Ash

Author

Janković, Ksenija, Stojanović, Marko, Bojović, Dragan, Terzić, Anja, Stanković, Srboljub J., Jedrzejewska, Agnieszka, Kanavaris, Fragkoulis, Azenha, Miguel, Benboudjema, Farid, and Schlicke, Dirk

Subjects
limestone filler, recycling, compressive strength, mineral additives, concrete technology, barite
Abstract

This study compared the performance of self-compacting concrete (SCC) based on fly ash addition and limestone filler. A SCC prepared with Portland cement, river sand, and limestone filler was used as a reference sample. Additional experimental self-compacting concretes with different types of fine aggregates, fillers, and special additives for increasing freeze-thaw resistance were prepared and optimized. The correlation between mix design, i.e., percentage of barite sand and additives, and properties of fresh SCC (slump-flow test, V-funnel test, and L-box test), as well as properties of hardened SCC (compressive strengths), were investigated and discussed. Part of the RILEM Bookseries book series (RILEM,volume 44)

Published
2023

39. Durability performance of binary and ternary blended cementitious systems with calcined clay:a RILEM TC 282 CCL review

Author

Dhandapani, Yuvaraj, Joseph, Shiju, Bishnoi, Shashank, Kunther, Wolfgang, Kanavaris, Fragkoulis, Kim, Taehwan, Irassar, Edgardo, Castel, Arnaud, Zunino, Franco, Machner, Alisa, Talakokula, Visalakshi, Thienel, Karl-Christian, Wilson, William, Elsen, Jan, Martirena, Fernando, Santhanam, Manu, Dhandapani, Yuvaraj, Joseph, Shiju, Bishnoi, Shashank, Kunther, Wolfgang, Kanavaris, Fragkoulis, Kim, Taehwan, Irassar, Edgardo, Castel, Arnaud, Zunino, Franco, Machner, Alisa, Talakokula, Visalakshi, Thienel, Karl-Christian, Wilson, William, Elsen, Jan, Martirena, Fernando, and Santhanam, Manu

Abstract

The durability performance of blended cementitious systems with calcined clays is reviewed in this paper by the RILEM TC 282-CCL on calcined clays as supplementary cementititous materials (SCMs) (working group on durability). The impact of metakaolin and other calcined clays on the porosity and pore structure of cementitious systems is discussed, followed by its impact on transport properties such as moisture ingress. The durability performance of binary and ternary cementitious systems with calcined clay is then reported with respect to chloride ingress, carbonation, sulphate attack, freeze–thaw and alkali-silica reaction. The role of unique microstructural alterations in concretes with calcined clay-limestone combinations due to the formation of CO3-AFm and their impact on different durability exposures is emphasised. While a large majority of studies agree that the chloride resistance of concretes with calcined clays is significantly improved, such concretes seem to be more susceptible to carbonation than those produced with plain Portland cement or other SCMs used at lower replacement levels. Also, several studies are focused on metakaolin and lower grade kaolinite clay, while there are limited studies on calcined smectite/illite or mixed clays, which could also play a crucial role to the improved adoption of large reserves of clay sources to produce sustainable binders.

Published
2022

42. Reducing the carbon footprint of lightweight aggregate concrete

Author

Kanavaris, Fragkoulis, Gibbons, Orlando, Walport, Emily, Shearer, Ed, Abbas, Ali, Orr, John, and Marsh, Bryan

Abstract

Lightweight aggregate concrete (LWAC) is a special concrete type with density of no more than 2200 kg/m3. Lower densities than normal weight concrete (2400-2500 kg/m3) are achieved using lightweight aggregates, which may originate from by-products of industrial manufacture such as fly ash, for example Lytag. Currently there is an increasing demand for LWAC for the construction of lightweight composite flooring systems, particularly in commercial buildings. Despite the well-recognized issues and challenges associated with the carbon dioxide (CO2) emissions from cement production, LWAC still contains high quantities of Portland cement (Type I or CEM I) as well as high quantities of total cementitious materials content. This has been primarily utilized to attain a certain workability and pumpability, as well as to not compromise the strength development. As such, the carbon footprint of LWAC is generally higher than that of normal weight concrete, owing also to the carbon intensive lightweight aggregates. In this work, several alternative lightweight aggregate mixes were optimized to maximize Portland cement replacement and reduce the total cementitious materials content without compromising the strength, workability and pumpability of a standard, to Eurocode 2, LC 30/33. The developed mixes contained up to 60% of ground granulated blast-furnace slag, as well as limestone powder, which resulted in a reduced carbon footprint compared to the conventional LWAC mixes. It was possible to reduce the Portland cement content by approximately 40%, the total cementitious materials content by 22% and embodied carbon (life cycle stages A1-3) by 12% compared to the initial, conventional LWAC mixes.

Published
2020

45. Macroscopic hygro-mechanical modeling of restrained ring test: results from COST TU1404 benchmark

Author

Šmilauer, Vit, Gasch, Tobias, Delaplace, Arnaud, Bouhjiti, David, Kanavaris, Fragkoulis, Azenha, Miguel, Lacarrière, Laurie, and Universidade do Minho

Abstract

The restrained ring test under constant temperature is used for estimating cracking tendency of pastes, mortar or concrete. This test induces hygro-mechanical interactions, with intricate interplay of several phenomena such as autogenous shrinkage, drying shrinkage, basic and drying creep, as well as evolution of tensile strength and fracture energy. The benchmark described in this paper relies on extensive experimental data sets obtained through the extended Round Robin Testing programme (RRT+) of COST Action TU1404. Five teams took part with their simulation models. A series of outputs were produced, starting from mass loss of a prism through its axial deformation up to stress/strain evolution in the ring. Three teams quantified also damage due to drying and stress concentration around a ring’s notch. All models showed excellent performance on mass loss while strain validation showed higher scatter and influence of several other factors. The benchmark demonstrated high capability of used models and emphasized strong role of calibration with regards to available experimental data., COST Action TU1404 (www.tu1404.eu), Czech Republic in the project TH03020404, FCT/FEDER(COMPETE2020, info:eu-repo/semantics/publishedVersion

Published
2018

49. The effect of temperature and ageing on the behaviour of self-compacting concrete containing supplementary cementitious materials

Author

Jędrzejewska, Agnieszka, Kanavaris, Fragkoulis, Azenha, Miguel, Benboudjema, Farid, Schlicke, Dirk, Almutlaqah, Ayman, Alshahrani, Abdullah, Maddalena, Riccardo, Kulasegaram, Sivakumar, Jędrzejewska, Agnieszka, Kanavaris, Fragkoulis, Azenha, Miguel, Benboudjema, Farid, Schlicke, Dirk, Almutlaqah, Ayman, Alshahrani, Abdullah, Maddalena, Riccardo, and Kulasegaram, Sivakumar

Abstract

Self-compacting concrete (SCC) is increasingly replacing conventional vibrated concrete due to its high flowability and low energy demand during construction. The substantial proportion of paste found in SCC yields a different microstructure to conventional concrete, and thus, when subjected to different curing temperatures, it exhibits distinctive mechanical behaviour. However, the effect of curing temperature on SCC containing supplementary cementitious materials (SCMs) as partial cement replacements is yet to be thoroughly investigated. This paper aims to assess the behaviour of SCC with various SCMs cured at different temperatures to estimate the robustness and applicability of these mixes in concrete structures. For this study, certain percentage volume fractions of the cement in the SCC mixes were replaced by silica fume (SF), fly ash (FA), or ground granulated blast-furnace slag (GGBS). Tests were conducted on the fresh concrete to verify that the prepared mixes complied with the criteria for self-compacting concrete. Thereafter, cubes were made from the SCC mixes and cured at different temperatures (10, 20, 35, and 50 °C). Cubic compressive strength tests were conducted at 1, 3, 7, 14, 28, 56 and 90 days. The results demonstrated that the strength gain tends to be slower at low curing temperatures (<20 °C). In contrast, high curing temperatures (>20 °C) could accelerate the strength gain in concrete but could also cause retardation of the strength development at a later age. However, using SCMs can make SCC more resistant to the detrimental effects of high curing temperatures.

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