论文部分内容阅读
利用水化热测定仪、XRD、红外、pH值跟踪等测试手段研究了碱式硫酸镁水泥的水化规律,研究表明碱式硫酸镁水泥的水化历程分为诱导前期、诱导期、加速期、减速期和稳定期。外加剂的加入,使活性氧化镁表面形成稳定的有机镁络合层,而延长了诱导期。有机镁络合层的形成,抑制氢氧化镁的生成,而促进5Mg(OH)2·MgSO4·7H2O相的形成。此外,研究了碱式硫酸镁水泥粉料存放时间和原料配比对水泥水化、凝结时间和抗压强度影响。研究表明,水泥存放时间越长,水化诱导期越长,凝结时间越长,早期强度降低。水泥粉料中活性氧化镁含量越高,水化放热量越高,强度越高,水泥胶砂的流动性越低。
The hydration regularity of basic magnesium sulfate cement was studied by means of hydration calorimeter, XRD, infrared and pH tracking. The results showed that hydration process of basic magnesium sulfate cement was divided into pre-induction period, induction period and acceleration period , Deceleration and stabilization period. Addition of additives makes the surface of activated magnesium oxide form a stable organo-magnesium complex layer, which prolongs the induction period. The formation of organic magnesium complex layer inhibits the formation of magnesium hydroxide and promotes the formation of 5Mg (OH) 2 · MgSO4 · 7H2O phase. In addition, the effects of the storage time of basic magnesium sulfate cement powder and the ratio of raw materials on the hydration, setting time and compressive strength of cement were studied. Studies have shown that the longer the cement storage time, the longer the hydration induction period, the longer the setting time, the lower the early strength. The higher the content of activated magnesia in cement powder, the higher the heat of hydration and the higher the strength, the lower the fluidity of cement mortar.