Modification and enhancement of mechanical properties of dehydrated cement paste using ground granulated blast-furnace slag

The grinding process and mechanical properties of dehydrated cement paste (DCP) were modified using ground granulated blast furnace slag (hereinafter as slag) according to the micro-ball mill effect and micro-aggregate effect. In order to investigate the effect of slag contents on the properties of DCP composite reactivated cementitious materials (DCRCM), hydration heat evolution and mechanical properties were analyzed, results of which indicated the extremely low particle hardness as the reason for the poor grinding effect and mechanical properties of DCP. The micro-ball mill effect of slag could solve the problems, such as sticking of particles to the boll and wall as well as occurrence of micro-agglomeration when only DCP was grinded. Slag could provide a micro-aggregate framework support for the DCRCM cementitious system, and composite reactivated cementitious materials with excellent mechanical properties were prepared.