Magnesia Modification Alkali-Activated Slag Fly Ash Cement: A Low Carbon Cement

摘要

Alkali-activated cement attracts increasing attention due to its low carbon emission and its consumption of solid waste; however, its high tendency to crack is one of the limiting factors to its utilization. In this paper a new type of magnesia modification alkali-activated cement was prepared, the strength, setting time, shrinkage ratio and cracking behavior, as well as the composition and structure of hydration product of it were investigated in this paper; the composition and structure of hydration product of this alkali-activated cement were observed, its hydration process was also studied. The results indicated that the setting time of this cement is similar to the ordinary commercial cements; its strength reaches the standard of 42.5 degree cement, its cracking resistance has been remarkably improved because of the micro-aggregate effect of fly ash and shrinkage compensating of magnesia.