干燥条件下高强混凝土的自收缩及其评价

Autogenously Shrinkage of High Strength Concrete Under Drying at Early Ages and Its Evaluation

以掺加矿渣微粉的高强混凝土为研究对象,以水胶比、干燥开始龄期为实验参数,综合考察了干燥条件下的混凝土收缩性状,基于水化反应程度的评价建立起自收缩、干燥收缩的体积变化成分分离方法,分析了干燥条件对自收缩应变的影响,进而评价了体积变化各成分的影响度。

In this study,autogenous and drying shrinkage of high strength concrete containing ground blast furnace slag under drying at early ages were investigated experimentally,in which water-binder ratio and initial drying age were used as experimental parameters.By separating autogenous shrinkage and drying shrinkage on the basis of hydration degree of cementitious materials,the influence of drying on autogenous shrinkage was discussed,and the contributions of various components to total volume change were evaluated.