掺外加剂对MgO水泥砂浆和混凝土压蒸膨胀率的影响

Influence of Admixture on MgO Cement Mortar and Concrete Autoclave Expansion Rate

通过对采用标准砂和工程砂制作的砂浆和混凝土试体掺不同品种外加剂的压蒸试验研究,表明掺不同品种外加剂对外掺MgO水泥砂浆和混凝土压蒸膨胀率的影响是不同的。还比较了不同MgO掺量的砂浆和混凝土试体掺与不掺外加剂的压蒸试验结果。试验所揭示出的压蒸膨胀率的基本规律是:砂浆试体掺外加剂的比不掺的大,混凝土试体掺外加剂的比不掺的小,砂浆和混凝士试体无论掺与不掺外加剂都是标准砂的小于工程砂。据此为制定压蒸安定性试验方法提供了试验依据。

In this paper it is demonstrated that autoclave tests of cement mortar and concrete specimens made by standard sand and project common sand admixed with different admixtures indicate that influences of different admixtures on the MgO cement mortar and conerete specimens autoclave expansion rates are different.Besides,autoclave test results of cement mortar and concrete specimens with different amounts of MgO admixed with admixtures and without admixtures are compared.These tests indicate：autoclave expansion rate of cement mortar specimens with admixtures is higher than that without admixtures,autoclave expansion rate of concrete specimens with admixtures is lower than that without admixtures,autoclave expansion rates of cement mortar and comcrete specimens made by project common sand with or without admixtures are lower than that made of standard sand.