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从纤维改善沥青温度稳定性入手,分析了纤维改善混合料高温稳定性的机理,进而研究纤维沥青混合料的高温稳定性。通过锥入剪切试验,用纤维沥青“剪切强度-温度敏感性系数”的概念评价纤维沥青的温度敏感性,发现纤维沥青的温度敏感性低,温度稳定性好。混合料车辙试验证明纤维明显提高了混合料的高温稳定性,研究发现只采用动稳定度作为指标具有局限性,建议同时采用“车辙变形的时间累积”这个指标综合评价混合料的高温稳定性。
Starting from the fact that fiber improves the temperature stability of asphalt, the mechanism that fiber improves the high temperature stability of the mixture is analyzed, and then the high temperature stability of the fiber asphalt mixture is studied. Through the conical shearing test, the temperature sensitivity of fiber asphalt was evaluated by the concept of fiber asphalt “shear strength-temperature sensitivity coefficient”. The results showed that fiber asphalt has low temperature sensitivity and good temperature stability. The test of the mixture rut proved that the fiber obviously enhanced the high temperature stability of the mixture. It was found that the dynamic stability of the mixture was limited by using the dynamic stability index. It is suggested that the “cumulative time of rutting deformation” should be used to evaluate the stability of the mixture at high temperature Sex.