Preparation Process and Early Working Performance of Inorganic Polymer-based Fast-hardening Concrete

For the purpose of delving deep into the preparation process and early working performance of inorganic cementitious composite material, and analyzing its application prospect in pavement emergency repair, the slag, fly ash and silica fume are used as solid cementitious materials, and sodium hydroxide and sodium silicate are used as alkali-activators to prepare inorganic polymer-based fast-hardening concrete (IPFC). The early working performance of the specimens with different contents of slag, fly ash and silica fume were compared and analyzed. The results show that, all the kinds of concrete mixtures have good fluidity, cohesiveness and water retentiveness. The addition of fly ash and silica fume can prolong the initial setting time of concrete, and the higher the content, the longer the extension time. And the slump of the mixture is inhibited by the addition of fly ash. When the content of fly ash is 15%, the slump of the mixture decreases by 19.2%. However, silica fume can improve the slump of the mixture. When the content of silica fume is 15%, the slump of the mixture increases by 19.1%.