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Fracture Properties of Aged Asphalt Mixtures Incorporating Recycled Tire Rubber and Styrene-Butadiene Rubber at Low Temperatures
Ming-Gin Leea*, Yu-Min Sub, Mang Tiac, Tuzyuan Huanga and You-Xiang Wanga
aDepartment of Construction Engineering, Chaoyang University of Technology, Taichung, Taiwan, ROC
bDepartment of Civil Coastal Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, Taiwan, ROC
cDepartment of Civil and Coastal Engineering, University of Florida, Gainesville, USA
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Abstract:
A laboratory investigation was conducted to evaluate the fracture properties of aged asphalt mixtures containing recycled ground tire rubber (GTR) and styrene-butadiene rubber(SBR) modifiers at low temperatures. Asphalt mixtures were compacted by the gyratory testing machine and aged according to the SHRP short term oven aging (STOA) and long term oven aging (LTOA) procedure. An experimental program was to evaluate the effects of different modifiers and aging conditions on the indirect tensile strength, creep compliance, resilient modulus, and fracture energy of compacted asphalt mixtures.
The results indicate that the fracture energy of asphalt mixtures at -10°C decreases slightly after the STOAor LTOA process in general, but the SBR-modified asphalt mixtures tend to increase at ultimate compaction condition.The GTR-modified asphalt mixtures have lower elastic stiffness (higher creep compliance intercepts) as compared with the unmodified mixtures before and after the LTOA process.The SBR-modified asphalt mixtures have higher fractureenergy at -10°C than that of mixtures containing the unmodified AC-30 and the GTR-modified asphalt. Based on indirect tensile creep compliance, tensile strength, failure strain andfracture energy, the GTR and SBR-modified mixtures show a greater potential to resist lowtemperature cracking as compared with theunmodified mixtures.
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Keywords: Fracture resistance; recycled tire rubber; ground tire rubber (GTR); styrene-butadiene rubber (SBR); fracture energy; asphalt mixture.
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Corresponding
author; e-mail: mglee@cyut.edu.tw
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©
2020
Chaoyang University of Technology , ISSN 1727-2394
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