高掺量粉煤灰固结材料的矿物组成及微观结构研究

Mineral composition and microstructure of cementitious materials with high content of fly ash

采用化学成分、X衍射和电子显微镜分析等方法研究了高掺量粉煤灰固结材料的矿物组成及微观结构。结果表明 ,其矿物组成主要是 3Al2 O3 ·2SiO2 和硅铝酸盐的胶凝物相 ,具有较大孔径的多孔结构特征 ,与水泥混凝土的矿物组成和微观结构有较大不同 ;粉煤灰的掺量、养护龄期对水化产物的生成量有直接影响 ;固结剂掺量大于 2 0 %时 。

Mineral composition and microstructure of fly ash_high cementitious materials were studied by such means as chemical analysis, XRD and SEM. The results show that the mineral composition is mainly 3Al 2O 3·2SiO 2 and silica_alumina gelled mineral. Fly ash_high cementitious materials are characterized by the structure of numerous big holes. The mineral composition and microstructure of these materials are quite different from those of cement concrete. The content of fly ash and the curing time affect directly the quantity of hydrated product. When the content is above 20%, the materials entirely react with the consolidating agent and form porous solid bodies.