碱激发矿渣净浆对氯离子的固化作用

为研究氯盐浸泡液pH值、激发剂种类对碱激发矿渣(AAS)净浆氯离子固化量的影响规律,采用氯盐暴露-平衡法、X射线衍射(XRD)、热分析(TGA-DSC)、扫描电镜(SEM)等分析了AAS净浆在氯盐浸泡前后的水化产物种类及微观形貌,同时对AAS净浆固化氯离子中的物理吸附和化学结合作用进行了量化评价.结果 表明:AAS净浆的氯离子固化量随着氯盐浸泡液pH值的增大而降低;水玻璃激发矿渣(WAS)净浆固化氯离子的能力大于NaOH激发矿渣(NAS)净浆;AAS净浆对氯离子的固化作用不仅包括物理吸附作用,还包括少量化学结合作用;氯离子固化过程中的物理吸附作用在NAS、WAS和普通硅酸盐水泥净浆中均占50％以上.

Solidification of Chloride Ions in Alkali-Activated Slag Paste

In this work, the influencing factors of the chloride binding capacity of alkali-activated slag paste are researched experimentally. The effects of pH value of chloride immersion solution and activator type on chloride binding capacity of alkali-activated slag were studied. The hydration products and micro-morphology of AAS before and after immersion in chloride solution were analyzed comparatively. The physical adsorption and chemical binding in the solidification of chloride by alkali activated slag paste were quantitatively evaluated. The results show that the chloride binding amount of alkali-activated slag decreases with the pH value of immersion solution. The binding capacity of slag activated by water glass is greater than that of slag activated by NaOH. The solidification of chloride of alkali activated slag not only includes physical adsorption, but also a small amount of chemical binding. For all three pastes involving NaOH activated slag, water glass activated slag and ordinary portland cement, the physical adsorption in the solidification of chloride accounts for more than 50 %.