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陕南地区沥青路面水损害防治技术研究

发布时间:2018-02-01 04:48

  本文关键词: 沥青路面 水损害 LSPM沥青混合料 防治技术 出处:《兰州交通大学》2015年硕士论文 论文类型:学位论文


【摘要】:我国沥青路面大都采用半刚性基层,路面内积水无法及时排出,滞留在面层结构内部和基层顶面,在行车荷载的作用下,水对沥青混合料产生侵蚀作用,导致路面出现网裂、龟裂、麻面、松散、坑槽、唧浆等病害,这些病害的出现主要与水有关,统称为水损害。水损害主要表现在公路使用的初期和早期,大大缩短了路面的使用寿命,增加了路面的维修成本,公路部门开始对水损害的维修和防治进行研究和探索,LSPM大粒径透水性沥青混合料开始尝试使用。本文通过对LSPM沥青混合料的发展现状和基本性能的分析,并结合陕西陕南地区暖温带和亚热带的气候条件以及降雨量充沛,山岭众多,公路纵坡大,具有触发水损害的特征,选用LSPM-25沥青混合料透水性结构层进行水损害处理,按照马歇尔试验原理和Superpave旋转压实法进行沥青混合料的配合比设计研究,选用了壳牌SBS I-C型改性沥青和当地石材。首先,对沥青和矿料进行原材料性能检测,发现壳牌SBS I-C型改性沥青粘度好,石材坚硬,各项指标均能满足要求;其次,采用“贝雷法”进行LSPM沥青混合料的矿料级配设计,确定级配组成为10-30mm:10-15mm:5-10mm:0-5mm:矿粉=59:16:13:10:2,在旋转压实次数100次的情况下,骨架嵌挤结构基本形成,级配组成合理;再次,从马歇尔试验、析漏试验、飞散试验和沥青膜厚度等方面综合确定最佳沥青用量为3.3%;最后,从高温稳定性、渗透性能和水稳定性三个方面对配合比进行验证,测得动稳定度4289次/mm,渗透系数0.254,沥青膜厚度达到12μm以上,各项指标均满足要求,确定的LSPM-25沥青混合料配合比合理。按确定的配合比和最佳沥青用量拌合LSPM-25沥青混合料对陕南地区某高速公路路面进行处理,在夏季最不利季节进行检测,平整度IRI值最大为1.93mm,小于规范规定值2.4mm,车辙深度最大值4.4mm,小于规范规定值5mm,维修通车一年后路面为出现裂缝、松散、麻面、坑槽等损害现象,使用情况良好,说明LSPM大粒径透水性沥青混合料具有较好的抗车辙能力和高温抗永久变形能力,适合陕南地区及气候和交通条件相似地区公路沥青路面水损害的防治。
[Abstract]:Most of the asphalt pavement in our country adopt semi-rigid base, the water in the pavement can not be discharged in time, stay in the surface structure and the top of the base, under the action of driving load, the water has an erosion effect on the asphalt mixture. Lead to network cracks, cracks, hemp surface, loose, pothole, slurry and other diseases, these diseases are mainly related to water, collectively known as water damage. Water damage is mainly in the early and early stage of highway use. Greatly shortens the pavement service life, increases the pavement maintenance cost, the highway department begins to carry on the research and the exploration to the water damage maintenance and the prevention and cure. LSPM asphalt mixture with large particle size has begun to be used. This paper analyzes the development status and basic performance of LSPM asphalt mixture. Combined with the warm temperate and subtropical climate conditions and abundant rainfall in southern Shaanxi Province, there are many mountains and large longitudinal slope of highway, which has the characteristics of triggering water damage. LSPM-25 asphalt mixture permeable structure layer was selected to deal with water damage, and the mix ratio design of asphalt mixture was studied according to Marshall test principle and Superpave rotary compaction method. Shell SBS I-C modified asphalt and local stone were selected. Firstly, the raw material performance of asphalt and aggregate was tested. It was found that Shell SBS I-C modified asphalt had good viscosity and hard stone. All indicators can meet the requirements; Secondly, the design of mineral aggregate gradation of LSPM asphalt mixture is carried out by "Bailey method". Make sure the composition is 10-30mm: 10-15mm: 5-10mm: 0-5mm: mineral powder 59: 16: 13: 10: 2, with 100 times of rotation compaction. The skeleton embossed structure is basically formed and the grading composition is reasonable. Thirdly, from Marshall test, leakage test, dispersion test and asphalt film thickness, the optimum asphalt content is 3.3. Finally, the mixture ratio was verified from three aspects: high temperature stability, permeability property and water stability. The dynamic stability was measured at 4289 times / mm, and the permeability coefficient was 0.254. The thickness of asphalt film is more than 12 渭 m, and all the indexes meet the requirements. The mixture ratio of LSPM-25 asphalt mixture is reasonable. According to the determined mix ratio and the best asphalt dosage, the mixture of LSPM-25 asphalt mixture is used to treat the pavement of a highway in the south of Shaanxi province. During the most unfavorable season in summer, the maximum IRI value of smoothness is 1.93 mm, which is less than the standard value of 2.4 mm, and the maximum rutting depth is 4.4 mm, which is less than the standard value of 5 mm. One year after the maintenance opened to traffic, cracks, loose, hemp surface, potholes and other damage to the road surface, the use of good conditions. The results show that LSPM has good rutting resistance and high temperature resistance to permanent deformation, which is suitable for water damage prevention of highway asphalt pavement in southern Shaanxi and similar climate and traffic conditions.
【学位授予单位】:兰州交通大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:U416.217;U418.6

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