详情

原文传递 FATIGUE BEHAVIOR OF STYRENE-BUTADIENE-STYRENE MODIFIED ASPHALTIC MIXTURES EXPOSED TO LOW-TEMPERATURE CYCLIC AGING.

题名：	FATIGUE BEHAVIOR OF STYRENE-BUTADIENE-STYRENE MODIFIED ASPHALTIC MIXTURES EXPOSED TO LOW-TEMPERATURE CYCLIC AGING.
作者：	Othman-A; Figueroa-L; Aglan-H
关键词：	ASPHALTIC-CONCRETE; POLYMER-ADDITIVES; STYRENE-BUTADIENE-COPOLYMER; STIFFNESS-; FLEXIBILITY-; FATIGUE-CRACK-PROPAGATION; LOW-TEMPERATURE-TESTS; THERMAL-CYCLING; FATIGUE-RESISTANCE
摘要：	Polymer modifiers are being considered to improve the high-temperature stiffness and low-temperature flexibility and hence the long-term performance of asphaltic mixtures. In this regard, styrene-butadiene-styrene (SBS) copolymer has received much attention. In the current research, the fatigue crack propagation resistance of an SBS-modified AC-5 mixture exposed to different durations of low-temperature thermal cycling is investigated. Beams were prepared using a constant 8% AC-5 asphalt by weight and 6% SBS as a percentage of the total binder. Aggregate gradation according to Ohio Department of Transportation Item 403 was used. Mixing and compaction were performed according to ASTM D 1559-89. A cyclic thermal aging program was performed in an environmental chamber between 21.1 deg C and -12 deg C for four different periods. The effect of thermal cycling on the fatigue resistance of the modified mixtures as determined by the modified crack layer (MCL) model was studied. A relationship between the number of thermal cycles and the specific energy of damage, a material parameter characteristic of the mixture's resistance to crack propagation, was established. The current investigation revealed that SBS modifier helps in maintaining a constant fatigue resistance of the mixture over a moderate number of low-temperature thermal cycles. A decrease in the fatigue resistance was observed at a higher number of thermal cycles. In addition, a dramatic improvement in the fatigue resistance of the SBS-modified AC-5 concrete mixture is seen when compared with that of the unmodified AC-5 over all durations of thermal cycling tested. The fatigue performance of the mixture as predicted from the MCL model through the specific energy of damage was consistent with predictions from the conventional resilient modulus and indirect tensile tests.
总页数：	Transportation Research Record. 1995. (1492) pp129-134 (9 Fig., 27 Ref.)
报告类型：	科技报告