碱磷渣胶凝材料硬化浆体及其与骨料界面结构

为研究碱磷渣胶凝材料的高强机理,用扫描电子显微镜研究了碱磷渣胶凝材料硬化浆体结构及其与骨料界面的结构,用压汞法研究了硬化浆体孔结构,并与硅酸盐水泥浆体的结构进行了对比.结果表明,与硅酸盐水泥浆体相比,碱磷渣胶凝材料浆体结构非常致密,孔隙率很低,孔径细小,浆体与骨料界面结构紧密,不存在如硅酸盐水泥浆体与骨料界面区常存在的Ca(OH)2定向生长及较非界面区疏松的情况.

Hardened paste of alkali-activated phosphorous slag cement and structure of paste-aggregate interface

In order to study the high-strength mechanism of alkali-activated phosphorous slag cement, the structures of the alkali-activated phosphorous cement paste and the paste-aggregate interface were studied using scanning electron microscopy, and the pore structure of the hardened paste was investigated using a mercury intrusion porosimeter. These features were compared with those of Portland cement paste. The results show that the structure of the alkali-activated phosphorous cement paste is dense with low porosity and a small pore size, compared with that of the Portland cement paste. The paste is tightly connected with aggregate, and there was no orderly development of Ca(OH)_2 crystals and a relatively looser structure at the paste-aggregate interface, which usually exists in Portland cement paste.