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改善花岗岩沥青混合料性能措施试验研究

, PP. 21-26

Keywords: 道路工程,花岗岩沥青混合料,改善效果,抗剥落剂,性能指标

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Abstract:

采取掺入抗剥落剂、掺入消石灰、用石灰岩石屑代替花岗岩石屑等单一或综合的措施,进行了各种措施下沥青混合料性能指标的室内试验,研究了不同措施对花岗岩沥青混合料路用性能的改善效果。试验结果表明(1)不同措施的改善效果不同,抗剥落剂对提高水稳定性、低温抗裂性较为有利,而消石灰对提高强度特性、高温稳定性较为有利。当同时掺抗剥落剂与消石灰时,花岗岩混合料的以上4种性能均会得到更明显的改善。(2)用石灰岩石屑代替花岗岩石屑再掺入外加剂的措施会进一步提高花岗岩沥青混合料的强度特性、水稳定性、高温稳定性与低温抗荷载破坏能力,但对低温抗收缩性能的改善不及同时掺入消石灰与抗剥落剂的效果好。

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