水泥-粉煤灰-矿渣粉三元胶凝体系体积稳定性的研究

Influence of Cementitious Materials on Volume Stability of Concrete

研究了不同胶凝材料体系水泥浆体的体积收缩变形特性。试验结果表明:水泥品种与细度是影响硬化浆体体积稳定性的主要因素,水泥细度越大,硬化浆体的体积稳定性越差,低热(高贝利特)硅酸盐水泥浆体的体积稳定性优于中热硅酸盐水泥;矿物掺和料的掺入使得胶凝材料的体积稳定性变得复杂,优质的矿物掺和料能够降低硬化浆体的收缩;水泥-粉煤灰二元胶凝体系的体积稳定性优于水泥-粉煤灰-矿渣粉三元胶凝体系。

The volume shrinkage of different cementitious materials was investigated. The results indicates the type and fineness of cement have significant effect on the volume stability of concrete, namely, the concrete with higher fineness cement has worse volume stability, and the low-heat Portland cement has better volume stability than the mid-heat Portland cement. But the mixing of mineral admixtures makes the volume stability of cementitious materials become complex. The mineral admixtures of high quality can reduce the shrinkage of hardened cement paste, and the duality system of cement-fly ash is more suitable to produce concrete of good volume stability than ternary system of cement-fly ash-slag powder.