60 results on '"Boz, Ilker"'
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52. Investigating the effect of rejuvenators on low-temperature properties of recycled asphalt using impact resonance test.
- Author
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Boz, Ilker and Solaimanian, Mansour
- Subjects
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LOW temperatures , *ASPHALT , *RESONANCE , *AWARENESS , *BRITTLENESS - Abstract
Use of recycled asphalt pavement (RAP) in highway construction is highly promoted due to recent awareness in sustainable construction practices. The concerns with material brittleness in utilising higher content of RAP are alleviated through addition of rejuvenators to some extent. Inclusion of rejuvenator to the aged binder improves its flexibility and lessens its cracking potential. A study was undertaken to investigate the effectiveness of the impact resonance (IR) testing in determining low-temperature binder properties through mixture testing. To this effect, the presented study consisted of two stages. In stage I, the IR test was conducted on mixes made with different low-temperature grade binders. Stage II consisted of testing pure RAP mixes treated with a rejuvenating agent at different levels using the IR as well as testing blends of recovered RAP binder and rejuvenator and virgin binder using bending beam rheometer (BBR). The IR test was performed at a range of temperatures between
and . The results indicate that the IR test can successfully capture the low-temperature properties of binders in virgin mixes as well as RAP mixes incorporating rejuvenator. A very high linear correlation was observed between stiffness from IR testing of the RAP mix and stiffness from BBR testing of the blend of recovered binder and virgin binder and rejuvenator. A good correlation was also observed between phase angle of RAP mixes obtained from IR with the m-value, a relaxation index, from BBR at a range of temperatures for a given rejuvenator content. The results clearly demonstrate the potential of IR to be used for grading and optimisation for the asphalt binder of RAP and rejuvenator content in lieu of the binder recovery method. [ABSTRACT FROM AUTHOR] - Published
- 2018
- Full Text
- View/download PDF
53. Evaluating the Rutting Potential of Asphalt Mixtures with Simple and Practical Tests
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Boz, Ilker, Habbouche, Jhony, Diefenderfer, Stacey D., Coffey, Griffin, Seitllari, Aksel, and Ozbulut, Osman E.
- Abstract
The objective of this study was to explore the use of monotonic loading tests (“monotonic tests”) as screening tools to assess the rutting potential of dense-graded asphalt surface mixtures in Virginia. To that end, three monotonic tests—the indirect tensile at high temperature (IDT-HT) test, the rapid rutting (RR) test, and the Marshall stability and flow (MS) test—identified from the literature, were evaluated using 16 plant-produced asphalt mixtures with “A” and “D” designations. The scope of the work also included performing the multiple stress creep and recovery test on the extracted and recovered binders. The results were applied to assess the monotonic tests and the asphalt pavement analyzer (APA) test relative to each other using several performance metrics. The results were also employed to develop performance threshold criteria for the tests being considered. The results showed that the IDT-HT and RR tests can be used to screen the rutting potential of asphalt mixtures meeting the Virginia Department of Transportation (VDOT) mixture volumetric and gradation requirements for A and D mixtures. The initial performance criteria for the IDT-HT and RR tests were established for these mixtures. Based on the results, the IDT-HT test was found to be the most suitable alternative test to the APA test.
- Published
- 2024
- Full Text
- View/download PDF
54. Investigating the effect of rejuvenators on low-temperature properties of recycled asphalt using impact resonance test
- Author
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Boz, Ilker, primary and Solaimanian, Mansour, additional
- Published
- 2016
- Full Text
- View/download PDF
55. The Effect of Aspect Ratio on the Frequency Response of Asphalt Concrete in Impact Resonance Testing
- Author
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Boz, Ilker, primary and Solaimanian, Mansour, additional
- Published
- 2015
- Full Text
- View/download PDF
56. Impact of Production Variability on Balanced Mix Designs in Virginia
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Virginia. Department of Transportation, United States. Department of Transportation. Federal Highway Administration, Bowers, Benjamin F., Lynn, Tiana, Yin, Fan, Moore, Nathan, Diefenderfer, Stacey D, Boz, Ilker, Auburn University. Dept. of Civil and Environmental Engineering, National Center for Asphalt Technology, Virginia Transportation Research Council (VTRC), Virginia. Department of Transportation, United States. Department of Transportation. Federal Highway Administration, Bowers, Benjamin F., Lynn, Tiana, Yin, Fan, Moore, Nathan, Diefenderfer, Stacey D, Boz, Ilker, Auburn University. Dept. of Civil and Environmental Engineering, National Center for Asphalt Technology, and Virginia Transportation Research Council (VTRC)
- Abstract
116425, The objective of this study was to evaluate the influence of production variability on performance test results to determine if mixtures balanced during design could become unbalanced during production. Fourteen currently accepted mixture designs, 10 BMD mixtures and 4 Superpave mixtures (to serve as a comparison between current standards and BMD designs), were recreated in the laboratory. Additionally, the mixes were adjusted to produce coarse and fine gradations and high and low binder contents according to currently accepted tolerance limits to simulate production variability. Two interaction mixtures assessing changes in gradation and binder content were evaluated as well as two critically aged mixtures.
57. Balanced Mix Design for Surface Mixtures: 2020 Field Trials
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Virginia. Department of Transportation, United States. Department of Transportation. Federal Highway Administration, Diefenderfer, Stacey D, Habbouche, Jhony, Boz, Ilker, Virginia Transportation Research Council (VTRC), Virginia. Department of Transportation, United States. Department of Transportation. Federal Highway Administration, Diefenderfer, Stacey D, Habbouche, Jhony, Boz, Ilker, and Virginia Transportation Research Council (VTRC)
- Abstract
119857, The Virginia Department of Transportation (VDOT) has been working toward the implementation of balanced mix design (BMD) for several years. During that time, special provisions have been developed to address dense-graded surface mixtures with reclaimed asphalt pavement (RAP) contents up to 30% and with RAP contents of 40% and above. In 2020, five field trials encompassing 12 mixtures were constructed to evaluate BMD mixtures designed and produced in accordance with VDOT’s special provision for surface mixtures with high RAP contents. Typical dense-graded Superpave surface mixtures were used as controls. This study documented and assessed these trials to provide information to evaluate the impact of various RAP contents and additives, production variability, reheating, and binder properties on BMD performance test results. Twelve mixtures were evaluated during the five field trials. The mixtures included combinations of different RAP contents, two binder grades, four recycling agents, and fiber. Volumetric and gradation analysis was performed on the mixtures. The Cantabro mass loss test (Cantabro test), the indirect tensile cracking test (IDT-CT), and the Asphalt Pavement Analyzer (APA) test were performed on laboratory-produced design specimens and non-reheated and reheated plant-produced, laboratory-compacted specimens. All findings and conclusions are limited to the mixtures evaluated. Based on the test results, mixtures containing 35% or greater RAP contents, softer binders, recycling agents, and fiber may be designed and produced to meet current BMD performance thresholds and current volumetric properties, gradation, and asphalt content requirements. It was found that some mixtures that were volumetrically designed under current VDOT specifications met BMD requirements. In addition, the expected trends in mixture performance testing were not always observed, likely due to masking by variability due to specimen fabrication practices or by inherent test variabilit
58. Balanced Mix Design for Surface Mixtures: 2021 and 2022 Plant Mix Schedule Pilots
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Virginia. Department of Transportation, United States. Department of Transportation. Federal Highway Administration, Diefenderfer, Stacey D, Boz, Ilker, Habbouche, Jhony, Virginia Transportation Research Council (VTRC), Virginia. Department of Transportation, United States. Department of Transportation. Federal Highway Administration, Diefenderfer, Stacey D, Boz, Ilker, Habbouche, Jhony, and Virginia Transportation Research Council (VTRC)
- Abstract
119819, Many state highway agencies are currently exploring a new approach for designing and accepting asphalt mixtures, known as the balanced mix design (BMD) method (hereinafter “BMD”). The Virginia Department of Transportation (VDOT) has made a commitment to adopt BMD to enhance the performance of asphalt mixtures. Since 2018, VDOT has taken incremental steps to phase in the use of BMD in production while addressing concerns expressed by VDOT and the industry. The use of BMD line items in selected 2021 and 2022 contracts has been an important learning opportunity for VDOT and the industry along the path to implementation. This study documented and assessed the 2021 and 2022 maintenance plant mix schedule pilots. The objectives of the study were to provide information on quality control, acceptance testing, and independent assurance testing; analyze the performance properties of reheated mixtures and extracted and recovered binders; and document lessons learned from the process. The analysis addressed several topics, including variability in production and testing and binder characterization and implications for performance. The pilot projects were developed by the VDOT districts using maintenance plant mix schedule contracts. In 2021, approximately 72,000 tons of BMD mixtures were paved on selected routes in 10 maintenance schedules across five districts. In 2022, approximately 222,000 tons of BMD mixtures were paved in 13 maintenance schedules distributed across all nine VDOT districts, with at least one BMD contract executed per district. The Cantabro mass loss test, the indirect tensile cracking test (IDT-CT), the Asphalt Pavement Analyzer rut test, and the indirect tensile test at high temperature (IDT-HT) were performed on laboratory-produced design specimens and non-reheated and reheated plant-produced, laboratory-compacted specimens. Basic and advanced binder testing and analysis were conducted on extracted and recovered binders from selected samples of the mixtur
59. Functional Characteristics of Dense-Graded Asphalt Surface Mixtures
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Virginia. Department of Transportation, United States. Department of Transportation. Federal Highway Administration, Boz, Ilker, Flintsch, Gerardo W, de León Izeppi, Edgar, Virginia Transportation Research Council (VTRC), Virginia. Department of Transportation, United States. Department of Transportation. Federal Highway Administration, Boz, Ilker, Flintsch, Gerardo W, de León Izeppi, Edgar, and Virginia Transportation Research Council (VTRC)
- Abstract
119604, This study assessed the short-term functional (surface) characteristics of pavements constructed using dense-graded asphalt surface mixtures designed with the balanced mix design (BMD) methodology as compared to counterpart mixtures designed using the existing design methodology (Superpave). Another objective of this study was to establish a functional performance baseline for the Virginia Department of Transportation’s (VDOT) BMD trial mixtures constructed in the 2019 through 2021 construction seasons in terms of friction and macrotexture. This study also sought to define a potential empirical relationship to link mixture volumetric properties to the surface characteristics of asphalt mixtures in terms of macrotexture. In this effort, 52 different field projects encompassing pairs of BMD and control mixtures with service lives ranging from 0.1 to 2.8 years were surveyed for friction, macrotexture, and pavement roughness. Descriptive statistics and parametric statistical techniques were used to identify systematic trends or differences in the functional characteristics of the pavements.
60. Development of guidelines for usage of high percent RAP in warm-mix asphalt pavements.
- Author
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Pennsylvania. Dept. of Transportation. Bureau of Planning and Research, Solaimanian, Mansour, Milander, Scott, Boz, Ilker, Stoffels, Shelley, Thomas D. Larson Pennsylvania Transportation Institute, Pennsylvania. Dept. of Transportation. Bureau of Planning and Research, Solaimanian, Mansour, Milander, Scott, Boz, Ilker, Stoffels, Shelley, and Thomas D. Larson Pennsylvania Transportation Institute
- Abstract
510602, PSU 032, Road construction using warm-mix asphalt has been rapidly gaining popularity in the United States, in part because, WMA is believed to be friendlier to the environment as compared to hot-mix asphalt. Parallel to this rapid growth in, WMA construction is utilization of reclaimed asphalt pavement (RAP) in road construction. Research was conducted, to develop guidelines for using high percentages of RAP in WMA. The laboratory work was focused on three WMA, technologies: water foaming, a chemical additive (Evotherm™), and an organic additive (Sasobit™). The work, included RAP characterization, mix design, moisture damage evaluation, and rutting evaluation using the Superpave, Shear Tester and Model Mobile Load Simulator Third Scale. Accelerated load testing was conducted at a, temperature range of approximately 42 to 50°C for 400,000 cycles of loading. Rutting resistance of the mixes was, rated as fair to good. This research indicates that it is possible to produce WMA with high RAP having sufficient, moisture damage and rutting resistance. However, a mix design established for HMA does not necessarily produce, satisfactory performance when used with WMA, and it is important that moisture damage and rutting susceptibility of, WMA be evaluated for any mix design, even though that mix design may have demonstrated satisfactory, performance for HMA.
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