水泥—钢渣—矿渣复合胶凝材料的水化特性

Hydration Properties of Cement-Steel Slag-Ground Granulated Blast Furnace Slag Complex Binder

通过测定水泥钢渣矿渣复合胶凝材料的水化热、砂浆的抗压强度、硬化浆体孔溶液的碱度、钢渣和矿渣的水化程度,探讨了复合胶凝材料的水化特性.结果表明：钢渣在复合胶凝材料水化硬化过程中所起的化学作用小于矿渣;随着复合胶凝材料中钢渣含量的增大和矿渣含量的减小,复合胶凝材料的早期和后期胶凝性能均降低;随着复合胶凝材料中矿渣的含量增大,硬化浆体孔溶液的碱度降低,矿渣的反应程度也随之降低,矿渣含量为10％～40％时,孔溶液的pH值为12.6～13.3;钢渣的反应程度受复合胶凝材料组成的影响很小;钢渣和矿渣在后期的反应程度提高明显,尤其矿渣所起的化学作用显著,矿渣在360 d龄期的反应程度超过50％,甚至60％,使复合胶凝材料砂浆的后期强度与水泥砂浆的差距明显缩小.

The hydration properties of cement-steel slag-ground granulated blast furnace slag （GGBS） complex binder were investigated via the determination of the hydration heat of binder,compressive strength of mortar,alkalinity of pore solution,and reaction degrees of steel slag and GGBS.The results show that the chemical contribution of steel slag to the hydration and hardening of complex binder is smaller than that of GGBS.The cementitious properties of complex binder become weaker as the steel slag content increases and the GGBS content decreases.The alkalinity of pore solution and the reaction degree of GGBS decrease with the increase of the content of GGBS in complex binder.The pH value of the pore solution is 12.6-13.3 when GGBS content is 10％-40％.The compositions of complex binder has a slight effect on the reaction degree of steel slag.Due to the significant increase of the reaction degrees of steel slag and GGBS at late ages,especially the chemical contribution made by GGBS whose reaction degree is higher than 50％ or even 60％,the late age compressive strength of mortar with complex binder is similar to that of pure cement mortar.