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改性沥青应力吸收层混合料低温抗裂性能评价

, PP. 29-35

Keywords: 道路工程,应力吸收层,试验研究,沥青混合料,低温抗裂性

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Abstract:

?为了评价应力吸收层复合改性沥青混合料的低温抗裂性能,设计试验夹具和制作试件,确定试验参数并进行圆盘拉伸破坏试验,采用拉伸劲度、拉伸破坏强度、断裂能评价其低温抗裂性,分析矿料级配、试验温度、沥青结合料类型、油石比对混合料低温抗裂性能的影响。结果表明:断裂能是评价应力吸收层混合料低温抗裂性能的综合指标,矿料级配对其抗裂性能影响较敏感,贴近级配中值混合料抗裂性能并非最优;低温抗裂试验比较合理的温度为0℃;普通SBS改性沥青难以满足应力吸收层混合料低温抗裂性要求。

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