水淬渣的胶凝活性及其形成机理

采用重新熔融水淬的方法制备不同水淬矿渣样品，综合进行净浆强度实验和碱溶出实验研究，借助XRD，DTA, TEM, SEM和EDX等分析手段，研究了矿渣形成过程、形成结构和胶凝性能之间的关系，并在此基础上探讨了矿渣潜在胶凝活性的形成机理. 研究表明，在合适的排渣温度和冷却速度条件下，水淬渣能够形成分相结构，对水淬渣胶凝活性产生重要影响. 分相矿渣具有富钙相和富硅相，富钙相的迅速溶解和富硅相的缓慢溶解是水淬渣水化过程中产生足够早期强度和发挥稳定后期强度的主要原因. 由于玻璃分相的影响，排渣过程存在最佳工艺条件，即最佳的排渣过程能使水淬渣形成玻璃分相结构，从而具有最好的活性.

Research of Formation Mechanism on Cementitious Reactivity of Water-cooled Slag

Water-quenched samples were prepared by re-melting blast furnace slag and then quenching it at different temperatures. The effects of forming process on the relationship between structure and cementitious reactivity of quenched slag were studied by XRD, DTA, TEM, SEM and EDX techniques in combination with mechanical property and alkali leaching tests. The results show that phase separation phenomena of different extents exist in samples. The samples with phase separation in completely vitreous structure possess better cementitious reactivity. Such vitreous structure consists of both Ca-rich and Si-rich phases, Rapid dissolving of Ca-rich phase and slow dissolving of Si-rich phase contribute to the cementitious reactivity of quenched slag.