粉煤灰对水工混凝土抗裂性能的影响

Influence of fly ash on crack resistance of hydraulic concrete

混凝土中的裂缝不仅给混凝土结构的整体性造成影响 ,而且还会对混凝土工程的耐久性造成威胁。本论文论述了粉煤灰掺入水工混凝土中 ,对降低水泥胶砂脆性系数 ,减小混凝土的弹性模量、干缩、绝热温升、自生体积变形和增大徐变度等的作用 ,并提出粉煤灰掺量与混凝土弹性模量的相关关系式 ,说明粉煤灰的掺入对提高水工混凝土的抗裂性能是有利的。

Crack will not only do harm to construction of concrete structures but also destroy durability of concrete project. In this paper, we narrate that we can decrease brittleness of cement, elastic modulus, shrinkage, hydration temperature, self-volume deformation of concrete, and increase creep by adding fly ash, and present relationship between content of fly ash and elastic modulus of concrete, which shows that adding fly ash into concrete will benefit crack resistance of hydraulic concrete.