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.
出处
《水泥工程》
CAS
2009年第6期10-13,共4页
Cement Engineering
关键词
碱激发水泥
开裂
磷石膏
体积稳定性
水化
alkali-activated cement
crack
magnesia
volume stability
hydration
