沸石对丁苯共聚物/水泥凝结硬化及早期水化的影响

为了解决丁苯共聚物/水泥复合胶凝材料凝结硬化慢的问题,将沸石作为调凝材料,讨论其对复合胶凝材料凝结时间和早期强度的影响,并从水化放热速率和水化产物的角度分析沸石调节凝结硬化的机理.结果表明:沸石能够加速丁苯共聚物/水泥复合胶凝材料的水化,通过促进C_3A和C_3S的水化,缩短复合胶凝材料的水化诱导期,提高加速期最大放热速率,促进AFt和Ca(OH)_2的生成,从而加速复合胶凝材料的凝结硬化,缩短凝结时间,提高早期强度.

Effect of Zeolite on the Setting, Hardening and Early Hydration ofStyrene Butadiene Copolymer/Cement

In order to solve the problem of slow setting and hardening of styrene butadiene copolymer/cement composite cementitious material, zeolite was used as set conditioning material. The effect of zeolite on the setting time and early strength of the composite cementitious material was discussed. The mechanism of zeolite accelerating the setting and hardening process was also analyzed from the point of hydration heat evolution rate and hydration products. The results show that zeolite can accelerate hydration of the composite cementitious material. By promoting the hydration of C3A and C3S, zeolite shortens the induction period, increases the maximum hydration heat evolution rate and promotes the generation of AFt and Ca(OH)2. Thus, the setting and hardening process of the composite cementitious material is accelerated, the setting time is shortened and the early strength is improved.