The effect of different retarders on the setting time of composite quick-hardening and early-strength cement paste at room temperature was studied.The hydration of cement was delayed by compounding a composite retarder.The products of ce ment hydration at different ages like Ca(OH)2 and AFt were analyzed by the setting time,hydration temperature peak,XRD and SEM.The effect of composite retarder components on the retardation mechanism of cement paste was discussed.The results show that the"citric acid-boric acid-β-cyclodextrin"retarder system can greatly inhibit the early C3S hydration.The reduction of Ca(OH)2 generation and the increase of adsorption amount make the Ca(OH)2 in the cement paste due to the synergistic effect.The con-centration of Ca(OH)2 was greatly reduced,which early hydration rate was effectively reduced and has a good retarding effect.
关键词
四元胶凝体系/复合胶凝材料/复合缓凝剂/水泥水化/凝结时间
Key words
quaternary cementitious system/composite cementitious materials/composite retarder/cement hydration/setting time
维普
万方数据