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橡胶沥青混合料疲劳性能的自愈合影响因素分析

, PP. 16-22

Keywords: 道路工程,橡胶沥青混合料,疲劳试验,自愈合,四点弯曲,行为方程

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Abstract:

?通过室内四点弯曲疲劳试验,选取ASTMD7460的NfNM疲劳判断标准,采用单因素对比分析的方法,对橡胶沥青混合料疲劳性能的自愈合能力的主要影响因素(沥青用量、试件破坏程度、胶粉掺量、空隙率、应变量大小、自愈合时间、自愈合温度以及荷载强度)进行了系统研究,并对考虑自愈合补偿后的橡胶沥青混合料的疲劳行为方程进行了回归拟合。结果表明:疲劳自愈合效率与沥青用量、自愈合时间成正比,与试件破坏程度、空隙率、应变量大小成反比,在胶粉掺量(胶粉与橡胶沥青的质量比)为20%,自愈合温度为60℃,荷载强度为5kPa时,疲劳自愈合效率分别达到最佳;考虑自愈合补偿的疲劳次数与应变量大小、沥青用量和空隙率存在很好的相关性。

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