低水胶比时水泥-粉煤灰复合胶结材的水化性能  

Hydrating Characteristics of Cementfly ash Composite Binderin the Condition of Low Waterbinder Ratio

作　　者：阎培渝[1,2] 杨文言[1,2] 崔路[1,2] 游轶 

机构地区：[1]清华大学土木工程系 [2]清华大学摩擦学研究所电镜室

出　　处：《建筑材料学报》1998年第1期68-71,共4页Journal of Building Materials

基　　金：混凝土材料国家重点实验室开放基金

摘　　要：研究了水泥粉煤灰复合胶凝材料在低水胶比条件下的水化产物与硬化浆体显微结构，探讨了高效减水剂对复合胶凝材料的水化产物、水化程度、硬化浆体显微结构的影响．水泥粉煤灰复合胶凝材料的水化产物与普通硅酸盐水泥相同．球形的粉煤灰微粒在浆体中起到微集料的作用，在低水胶比条件下，有助于改善新拌浆体的流动性与硬化浆体的断裂性能，提高其强度．掺有ＦＤＮ的复合胶凝材料其初期水化程度并不因表观水胶比低而降低．水泥粉煤灰复合胶凝材料与高效减水剂协同作用，在低水胶比条件下能获得较好的力学性能．The hydration products and the microstructures of hardened pastes of the cementfly ash composite binder were investigated.The influences of superplasticizer upon the hydration products,the hydrating degree and the microstructures of hardened pastes of the composite binder were studied.The cementfly ash composite binder has similar hydration products to ordinary Portland cement.Spherical fly ash particles perform as “microfiller” in the paste in the condition of low waterbinder ratio to improve the fluidity of fresh paste and the cracking characteristics of hardened paste,therefore to increase strength of the composite binder.The hydrating degree of superplasticized binders in the early hydrating period is a little higher than that of controlled samples although they have lower apparent waterbinder ratio.Coacting effect of cementfly ash composite binder with superplasticizer can gain good mechanical properties.

关 键 词：水泥浆体 粉煤灰 高效减水剂 水胶化 水化 硬化 

分 类 号：TU528.042[建筑科学—建筑技术科学]