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The effect of long-term oxidation on the rheological properties of polymer modified asphalts

机译：长期氧化对聚合物改性沥青流变性能的影响

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摘要

The effect of long-term aging on rheological properties of polymer modified asphalt binders was studied. Modifiers included diblock poly(styrene-b-butadiene) rubber, triblock poly(styrene-b-butadiene-b-styrene), and tire rubber. Asphalt aging was carried out either at 60℃ in a controlled environmental room or at 100℃ in a pressure aging vessel [AASHTO Provisional Standards, 1993]. Both dynamic shear properties and extensional properties were investigated. Polymer modification resulted in increased asphalt complex modulus at high temperatures, decreased asphalt complex modulus at low temperatures, broadened relaxation spectra, and improved ductility. Oxidative aging decreased asphalt temperature susceptibility, damaged the polymer network in binders, further broadened the relaxation spectrum, and diminished polymer effectiveness in improving asphalt ductility.
机译：研究了长期老化对聚合物改性沥青粘合剂流变性能的影响。改性剂包括二嵌段聚（苯乙烯-b-丁二烯）橡胶，三嵌段聚（苯乙烯-b-丁二烯-b-苯乙烯）和轮胎橡胶。沥青老化是在环境受控的房间中于60℃或在压力老化的容器中于100℃进行的[AASHTO临时标准，1993]。研究了动态剪切性能和拉伸性能。聚合物改性导致高温下沥青复数模量增加，低温下沥青复数模量降低，弛豫谱变宽，延展性提高。氧化老化降低了沥青温度敏感性，破坏了粘合剂中的聚合物网络，进一步拓宽了弛豫谱，并降低了聚合物在改善沥青延展性方面的有效性。

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