水泥乳化沥青稳定碎石温缩特性

为解决半刚性基层沥青路面反射裂缝问题,在水泥稳定碎石中加入乳化沥青形成半柔性基层,采用DT80智能数据采集仪,通过电阻应变片对水泥乳化沥青稳定碎石试件的温缩系数进行测定,并对其温缩机理进行探究.分析了养护龄期、乳化沥青用量(质量分数,下同)和水泥用量对水泥乳化沥青稳定碎石温缩特性的影响.结果表明:在水泥稳定碎石中加入乳化沥青,可有效提高其抗温缩性能;温缩系数随乳化沥青用量的增加而减小;随着水泥用量的增加,平均温缩系数先减小后增大;平均温缩系数达到最小值时,对应的水泥用量4.0%为最佳水泥用量,且乳化沥青用量不宜超过3.0%.

Temperature Shrinkage Characteristics of Cement Emulsified Asphalt Stabilized Crushed Stones

In order to solve the problem of reflection crack of semi rigid base asphalt pavement, emulsified asphalt was added into cement stabilized crushed stones to form semi flexible base. Temperature shrinkage coefficient of cement emulsified asphalt stabilized crushed stones specimens was measured by means of resistance strain gauge along with DT80 intelligent data acquisition instrument. The temperature shrinkage mechanism was explored. The effects of aging time, use level(by mass) of emulsified asphalt and cement content(by mass) on temperature shrinkage characteristics were analyzed. Results show that addition of emulsified asphalt can effectively improve the temperature shrinkage performance of cement stabilized crushed stones; temperature shrinkage coefficient decreases with the increasing use level(by mass) of emulsified asphalt; the average temperature shrinkage coefficient decreases first and then increases with the increase of cement content(by mass); when the average temperature shrinkage coefficient reaches a minimum, the corresponding optimum cement content(by mass) is 4% and the use level(by mass) of emulsified asphalt is no more than 3%.