不同矿渣水泥水化情况的微观分析

Microstructure analysis of different slag cement during hydration process

对矿渣熟料水泥和矿渣石灰水泥水化过程进行了扫描电镜(SEM)分析。结果表明:在水化的早期,主要是熟料的水化,太钢矿渣粉也出现了水化的迹象;随着水化的进行,矿渣水化加强,同时两种矿渣水泥的水化产物几乎可以把矿渣的表面全部覆盖;在28 d的水化产物中氢氧化钙更加明显,呈现的是层状,说明氢氧化钙的量在矿渣水泥中从3d到28d一直都在长大,也表明矿渣28 d以前的水化过程中,矿渣的水化速度要落后于氢氧化钙的生成速度,即矿渣的水化对矿渣水泥的水化影响主要是在水化的后期;对未水化矿渣的SEM分析表明:矿渣的玻璃体结构破坏早期在矿渣的表面出现点蚀,随着水化的进行,点蚀程度加大,有些成为坑蚀。

The SEM analysis of hydration process of slag-clinker cement and slag-lime cement is performed. The results showed that it mainly is hydration of clinker,and there appears to be sign for Tslag in the early hydration age. With the hydration, the hydration of slag was strengthened and the whole surface of two kinds of slag was almost covered by the reactive products of slag cement. Within the reactive products for 28 day, the calcium hydroxide is more obvious and appears orientable arraying phenomena, so it indicated that the quantity of calcium hydroxide is on the increase from 3 day to 28 day and it is slower for the hydration speed of slag than the forming speed of the calcium hydroxide. The SEM analysis of nonreactional slag showed that the point corrosion appears on the surface of slag particle in early stage of glass body structure destruction, and with the hydration, the corrosion was more deeply and developed to pit corrosion.