基于振动搅拌的水泥稳定碎石基层性能试验

Experiment on Performance of Cement Stabilized Macadam Base Based on Vibratory Mixing

为了解振动搅拌下水泥稳定碎石在施工后半刚性基层的性能,采用普通搅拌设备和振动搅拌设备分别制备水泥稳定碎石并经过常规的摊铺和压实工艺后测试基层的压实度、抗压强度和摊铺高度。结果表明,在相同的摊铺条件下,普通搅拌的水泥稳定碎石在摊铺后虚铺层表面有明显的离析现象,而振动搅拌的虚铺表面无离析,集料分布均匀;在相同的压实工艺下,振动搅拌混合料的压实度高于普通搅拌,终压后振动搅拌混合料的水泥含量平均值略大于设计值且波动小,普通搅拌则波动较大。

In order to understand the performance of semi-rigid base after construction of cement stabilized macadam under vibratory mixing, ordinary mixing equipment and vibratory mixing equipment were used to prepare cement stabilized macadam, and the compactness, compressive strength and paving height of base course were tested after conventional paving and compacting process.The results show that under the same paving conditions, there is obvious segregation phenomenon on the surface of deficiency pavement after paving cement stabilized macadam with ordinary mixing, but there is no segregation on the surface of deficiency pavement with vibratory mixing, and the aggregate is well-distributed.Using the same compaction technology, the compactness of vibratory mixing mixture is higher than that of ordinary mixing mixture, and the average cement content of vibratory mixing mixture after final compaction is slightly larger than the designed value;the fluctuation is small comparing to ordinary mixture.