论文部分内容阅读
沥青混合料密实程度的大小直接影响到路面结构的抗拉或抗压强度,橡胶沥青混合料中由于高弹性废胎胶粉的存在,使得其压实后的特性与普通沥青混合料有很大的区别。根据研究内容选用橡胶沥青混合料AR-SMA-13进行橡胶沥青中不同胶粉掺量、不同油石比、不同细料控制率、不同击实功(次数)的马歇尔击实试验,测其击实后与冷却后试件高度计算线膨胀率,分析马歇尔试件线膨胀率与以上各因素之间的关系,并分析橡胶沥青混合料线膨胀性能与体积指标之间的相关性。结果表明,随着橡胶沥青中胶粉掺量的增加,AR-SMA-13橡胶沥青混合料马歇尔试件线膨胀率呈对数增加;增加合成矿料中0.075 mm的通过率,混合料马歇尔试件的线膨胀率呈线性增加;增加击实功,混合料的空隙率变小,试件的线膨胀率随之增大;建立的线膨胀率预估模型,能够很好地模拟试验数据;压实度越大,橡胶沥青混合料AR-SMA-13的线膨胀率也越大。
The density of asphalt mixture directly affects the tensile strength or compressive strength of the pavement structure. Because of the presence of high-elasticity waste rubber powder in the rubber asphalt mixture, the compaction characteristics of the asphalt mixture are very large compared with that of common asphalt mixture The difference According to the research, the rubber asphalt mixture AR-SMA-13 was used to test the compaction of rubber asphalt with different rubber powder, different oilstone ratio, different fines control rate and different compaction times (times) The linear expansion coefficient of post-cooling and post-cooling specimen was calculated. The relationship between linear expansion coefficient of Marshall test piece and the above factors was analyzed. The correlation between linear expansion property and volume index of rubber asphalt mixture was analyzed. The results show that with the increase of the content of rubber powder in rubber asphalt, the linear expansion rate of AR-SMA-13 rubber asphalt mixture increases logarithmically; increasing the passing rate of 0.075 mm in synthetic mineral materials, the Marshall test The linear expansion rate of the linear increase of the linear increase; increase the compaction, the mixture of the porosity becomes smaller, the specimen linear expansion rate increases; established linear expansion rate prediction model, can well simulate the experimental data; Compaction of the greater the rubber asphalt mixture AR-SMA-13, the greater the linear expansion.