Implementation of Semi-Circular Bend (SCB) Test for QC/QA of Asphalt Mixtures
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2024-06-01
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Edition:Final Report June 2024
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Abstract:The growing use of recycled asphalt materials in asphalt pavement poses durability concerns due to the replacement of virgin asphalt binder with recycled binder. The current volumetric-based Superpave mixture design is insufficient in addressing these concerns. To supplement conventional volumetric design, performance-based testing was introduced to assess the cracking performance of asphalt mixtures. The Louisiana DOTD Specifications for Roads and Bridges recommend using the critical strain energy release rate, Jc, obtained from the semi-circular bend (SCB) test, as a complement to evaluate the cracking resistance of asphalt mixtures. However, the requirement of long-term aging (LTA) for SCB samples at 85°C for 5 days is time-consuming for quality control/assurance (QC/QA) practices. Therefore, estimating SCB Jc for long-term aged asphalt mixtures based on unaged asphalt binder and mixture properties is beneficial. The objective of this study was to develop practical methods to predict SCB Jc of LTA asphalt mixtures for use in QC/QA programs. Fourteen field asphalt mixtures from throughout Louisiana were selected for this study.
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