贫混凝土基层材料干燥收缩特性

Property of dry contraction of lean concrete for roadbase

道路基层贫混凝土水泥用量较大而且是暴露面积较大的工程 ,容易发生较大的干燥收缩。为探索贫混凝土的干缩特性 ,通过室内试验 ,研究分析了贫混凝土的干燥收缩特性及不同种类贫混凝土在不同龄期的干缩系数值 ,并对其进行了理论分析。结果表明 ,贫混凝土的干缩小于普通混凝土 ,而且掺加优质粉煤灰后 ,可降低收缩值。

The lean concrete road base is easy to bring dry contraction due to its much amount of cement and large exposed area. The paper studied the dry contraction property of lean concrete through test in lab,and researched the parameter of dry contraction coefficients of different kinds of lean concrete in several ages.The results indicate that the dry contraction coefficients of lean concrete is less than common concrete,and it will be reduced when the high quality fly ash is added in the lean concrete.