The lean concrete road base is easy to bring dry contraction due to its much amount of cement and large exposed area.
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。
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.
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。
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