乳化沥青碾压贫混凝土路面基层材料研究

通过4种乳化沥青掺量的碾压贫混凝土工作性能观测,借助微机控制万能试验机测试无侧限抗压强度、间接抗拉强度和劈裂回弹模量,进行5次冻融循环实验,并借助扫描电镜观察乳化沥青与水泥浆体的微观结构特征。结果表明,乳化沥青掺量增加,降低了贫混凝土的工作性能、无侧限抗压强度、间接抗拉强度和劈裂回弹模量,乳化沥青微粒分散不均匀和局部黏聚成膜是引起贫混凝土力学性能离散的主要原因;增大乳化沥青掺量,贫混凝土抗冻性指标略有提高;水泥水化产物与沥青相互交织,改善了沥青与其它固化颗粒的界面性能;6%掺量的乳化沥青贫混凝土满足我国对沥青路面半刚性基层强度和回弹模量的要求。

Material Research on Emulsified Asphalt Introduced in Rolled Lean Concrete Base Course

By observing the working performance of rolled lean concrete introduced by four volumes emulsified asphalt,this study tested the unconfined compressive strength,indirect tensile strength and split resilient modulus by microcomputer controlled universal testing machine. The test caried out five times of freeze- thaw cycle,and observed the microstructure characteristics of emulsified asphalt and cement paste by MES. The results indicated that by increasing the volume of emulsified asphalt,the working performance,the unconfined compressive strength,indirect tensile strength and split resilient modulus are reduced. The mechanics performance of rolled lean concrete discrete because of that asphalt emulsion particles dispersed unevenly and local film cohered. But anti frost resistance index is increased a slight. The hydration products of cement intertwine with asphalt,thus improve the interfacial performance of asphalt and other curing particles. The strength and split resilient modulus of rolled lean concrete introduced by 6% volume emulsified asphalt and meet our requirements for the semi- rigid base asphalt pavement.