万家寨水利枢纽工程粉煤灰补偿收缩混凝土性能研究

Research on fly ash shrinkage compensating concrete for the Wanjiazhai Hydroproject

通过对掺粉煤灰低热微膨胀补偿收缩混凝土的强度、变形和耐久性等基本性能及其自生体积变形和不同约束、不同养护条件下的预压应力进行系统的试验研究，并对其微观结构进行了分析。结果表明，掺２０％的优质粉煤灰不但可以配制满足万家寨水利枢纽工程技术要求的补偿收缩混凝土，而且能降低混凝土的干缩变形。

The strength, deformation, durability, autogenous volumetric deformation and prestressing force for low temperature shrinkage compensating concrete are systematically studied. In addition, the simulation is analysied. Research results show that, at 20% fly ash internal addition,the shrinkage compensating concrete not only meets the demands of design, but also reduces the drying shrinkage, decreases tensile stress and retards the time of tensile stress.