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基于耗散能法分析热拌及温拌再生SMA沥青混合料的疲劳特性

Keywords: 疲劳特性,热拌及温拌再生SMA沥青混合料,耗散能法,废旧沥青路面材料(RAP),Sasobit

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Abstract:

为了分析废旧沥青路面材料(reclaimedasphaltpavement,RAP)掺量和Sasobit对再生沥青玛蹄脂碎石混合料(stonemasticasphalt,SMA)疲劳性能的影响,本文设计并比较了不同RAP掺量(0%、20%、30%)的热拌及温拌SMA沥青混合料.对不同类型SMA沥青混合料进行四点梁弯曲疲劳试验,采用耗散能法分析其疲劳特性.研究表明:1)不同类型SMA沥青混合料的疲劳次数与累计耗散能之间的关系不会随RAP掺量改变以及是否添加Sasobit发生变化,其疲劳寿命与累计耗散能在双对数下,均表现出良好的线性关系,且具有唯一的关系方程.2)随着RAP掺量的增加,再生SMA沥青混合料的累积耗散能降低,疲劳寿命下降.3)Sasobit对温拌SMA沥青混合料耗散能量的能力有不利影响,而对温拌再生SMA沥青混合料影响不大.

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