外掺乳化沥青贫混凝土性能研究

A Study on Properties of Lean Cement with Emulsified Asphalt

通过MTS测量了3种乳化沥青掺量的碾压贫混凝土的无侧限抗压强度、弯拉强度、抗压模量和弯拉模量,以及在无养护与正常养护条件下的收缩读数。结果表明,乳化沥青掺量增加,贫混凝土的无侧限抗压强度和弯拉强度有所下降,主要是沥青粘聚成膜阻碍水泥水化进程,影响强度形成;贫混凝土的抗压弹性模量和抗弯拉弹性模量降低,贫混凝土的变形性能改善,且具有一定的柔韧性;贫混凝土干缩与开裂减少,基层柔韧度改善,道路使用寿命延长。

The mechanical testing system is used to measure compressive strength,flexural strength,compressive modulus and flexural modulus of three kinds of lean concrete with different emulsified asphalt content.The shrinkage of lean concrete with different emulsified asphalt is measured under the condition without curing and normal curing.Results indicate that the compressive strength and flexural strength decline with the increasing of emulsified asphalt content,because asphalt membrane retards the hydration process of cement.The compressive modulus and flexural modulus decline and the deformation behavior of lean concrete is improved.Also the drying shrinkage and cracking of lean concrete decrease,the flexibility of base is improved and service life of road increases with the increasing of emulsified asphalt content.