纤维沥青混合料高温稳定性研究

A Study on High Temperature Stability of Fiber Asphalt Mixture

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。

Through the rut test of fiber asphalt, the temperature sensitivity coefficient of shear strength is put forward to evaluate temperature sensitivity of the fiber asphalt. Through analyzing the results of rut test, it is found that fiber can make the high temperature stability of asphalt mixture to get an obvious exaltation, and that dynamic stability has limitation for the only criterion of high temperature stability in rut test. It is proposed that dynamic stability and time accumulation of rut deformation should be used to appraise high temperature stability of asphalt mixture in rut test.