新溆高速公路SMA-13配合比设计与应用研究
发布时间:2018-03-23 23:27
本文选题:SMA-13 切入点:沥青玛蹄脂 出处:《长沙理工大学》2015年硕士论文
【摘要】:随着沥青玛蹄脂碎石沥青路面(SMA)的技术越来越成熟,越来越多的道路工作者开始注意到其优良的高温稳定性、低温抗裂性、抗滑性能等,SMA也得到了较为广泛的应用,同时其良好的耐久性能也得到研究人员的认可。然而,由于目前路上交通量逐渐变大且我国SMA的配合比设计和施工技术还不够完善,一些已经运营和建设中的SMA路面不同程度的出现了渗水、泛油等早期损害现象,影响了工程质量,对路面使用性能产生了极大的影响。本文结合新溆高速公路的建设,将上面层设计为改性沥青SMA-13,以应对工程所面临的大交通量及不利气候影响,充分发挥沥青玛蹄脂碎石(SMA)优良的路用性能,最终达到改善新溆高速公路工程的道路品质、延长使用寿命、提高行车的舒适性和安全性等目标,从而带来明显的经济效益和社会效益。研究成果对湖南省其它地区乃至全国的SMA沥青混合料的的设计和施工都具有指导或参考作用。从SMA混合料材料组成、材料所起的作用、力学强度形成机理等方面对SMA混合料的特性进行理论分析。结合新溆高速公路项目的建设,通过改变SMA-13沥青混合料的击实次数和拌和温度等条件,进行不同条件下沥青混合料的室内实验,来研究击实次数及拌和温度对沥青混合料性能的影响,提出了SMA-13适合的击实次数和拌和温度。结果表明,新溆高速公路项目SMA-13沥青混合料合理击实次数范围为75至80次,比普通马歇尔试验击实次数50次高出50%-60%,最佳拌和温度为175℃。在合理击实次数和最佳拌和温度条件下制成的马歇尔试件具有更好的物理力学性质,更符合交通量变大的实际情况。根据确定的SMA-13混合料级配和拌和温度,分别在设计沥青用量和最佳沥青用量下拌制SMA-13混合料并成型试件,分别进行车辙试验、浸水马歇尔试验、小梁低温弯曲试验以及冻融劈裂试验。结果表明,根据合理击实次数和拌和温度确定最佳油石比的SMA-13沥青混合料比按传统方法确定最佳油石比的混合料的路用性能更为优良。根据新溆高速公路SMA-13面层施工情况,对SMA-13面层的施工工艺和质量控制技术进行研究,总结了SMA-13面层的施工工艺和质量控制技术。
[Abstract]:As the technology of asphalt mastic asphalt pavement (SMA) becomes more and more mature, more and more road workers begin to pay attention to its excellent high temperature stability, low temperature crack resistance, skid resistance and so on. At the same time, its good durability is also recognized by researchers. However, due to the increasing traffic volume on the road and the inadequate mix design and construction technology of SMA in China, Some SMA pavement in operation and construction have some early damage phenomena, such as water seepage, oil flooding and so on, which affect the quality of the project and have a great impact on the pavement performance. The top layer is designed as modified asphalt SMA-13, in order to cope with the large traffic volume and adverse climate impact of the project, to give full play to the excellent road performance of asphalt mastic macadam (SMA), and finally to improve the road quality of Xinjiao Expressway Project. Extend service life, improve driving comfort and safety and other goals, The research results can be used as a guide or reference for the design and construction of SMA asphalt mixture in other areas of Hunan Province and even for the whole country. The characteristics of SMA mixture are theoretically analyzed in terms of the forming mechanism of mechanical strength. Combined with the construction of Xinji Expressway, the compaction times and mixing temperature of SMA-13 asphalt mixture are changed. In order to study the influence of compaction times and mixing temperature on the performance of asphalt mixture under different conditions, the compaction times and mixing temperature of SMA-13 are put forward. The reasonable compaction times of SMA-13 asphalt mixture in Xinzhang Expressway Project range from 75 to 80 times. The compaction times of Marshall test are 50 times higher than those of ordinary Marshall test, and the optimum mixing temperature is 175 鈩,
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