磷石膏改性硫碱复合激发矿渣水泥实验研究  

Experimental investigation on phosphogypsum modification alkali-activated cement

作　　者：王义恒[1] 沈卫国[1] 聂纪强[2] 孟令友[3] 张涛[1] 周明凯[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070 [2]成都建筑材料工业设计研究院有限公司,四川成都610021 [3]广东省理工职业技术学校,广东广州510500

出　　处：《水泥工程》2009年第6期10-13,共4页Cement Engineering

摘　　要：碱激发水泥由于与硅酸盐水泥相比具有很低的碳排放而被日益重视,但容易开裂是碱激发水泥的固有缺陷之一。试验采用磷石膏对硫碱复合激发矿渣水泥的强度、凝结时间、收缩率和开裂情况以及水化物组成与结构进行了改性研究;观察了这种碱激发水泥的水化产物的形貌和组成,并探讨这种水泥水化过程和体积稳定性。研究表明:该水泥初凝时间为190min,终凝时间为287min,凝结时间和一般的通用水泥相当;强度达到42.5级,抗裂性有大幅度的改善,钙矾石的骨架作用是其抗裂性改善的原因。Alkali-activated cement attracts increasing attention as its low carbon emissions compared with that of the Portland cement, but it is easy to crack is one of the intrinsic defects. The strength, setting time, shrinkage radio and cracking behave, as well as the composition and structure of hydration product of phosphogypsum modification alkali-activated cement were investigated in this paper; the composition and structure of hydration product of this alkali-activated cement was observed, and the hydration process and volume stability of this cement were discussed. The research shows that the initial setting time is 190 min, the final setting time is 287min, the setting time of the cement is similar to the ordinary commercial cement; its compressive strength reaches the standard of 42.5 degree cement, the cracking resistance has been remarkably improved, the shrinkage compensating of ettringite is the mechanism of the cracking resistance modification.

关 键 词：碱激发水泥 开裂 磷石膏 体积稳定性 水化 

分 类 号：TQ172.4[化学工程—水泥工业]