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沥青混合料低温冻断试验设备的研发及试验验证

, PP. 17-22

Keywords: 道路工程,沥青混合料,低温性能,评价方法,冻断温度

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Abstract:

通过模拟沥青路面温度裂缝产生原理,自行研发了沥青混合料低温冻断试验设备,并进行了试验验证。通过应用位移实时补偿系统和耐低温高精度传感器,开发试件对心装置,采用不同的试件安放方式,这些措施使得该设备具有试验精度高、试验结果准确等特点。该设备可以完成沥青混合料温度应力试验、应力松弛试验、直接拉伸试验和收缩系数试验。利用该设备评价了几种沥青混合料的低温抗裂性能,试验结果表明,该设备试验复现性好、可以有效地区分不同沥青混合料的低温性能。由该设备得到的冻断温度和转化点温度可作为评价沥青混合料低温性能的指标。

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