In this paper, through the strain monitoring of fly ash concrete and mineral powder concrete in super long structure concrete, the shrinkage law of concrete in the test block and entity using two kinds of admixture is discussed. The results show that the development law of the concrete block and wall strain of two kinds of admixtures is the same. Under the same solid condition, the mineral powder is about 170με. The strain of fly ash concrete is about 110με, which is much smaller than that of mineral powder concrete, which proves that the concrete shrinkage of concrete with single fly ash is smaller. At the same time, through the engineering practice application, summed up the control concrete shrinkage several aspects.%通过对粉煤灰混凝土和矿粉混凝土在超长结构混凝土中的应变监测,探讨使用两种掺合料的混凝土在试件和实体中的收缩规律,结果表明两种掺合料的混凝土试件和墙体应变发展规律相同.在相同的实体条件下,截至龄期180d,矿粉混凝土应变约170με;粉煤灰混凝土应变约110με,比矿粉混凝土小很多,证实采用单掺粉煤灰的混凝土在实体中收缩量更小.通过实践总结控制混凝土收缩的几个方法.
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