Self-flowing low cement refractory castables with a novel dispersant system

摘要

Self-flowing low cement refractory castables(LCC) with the novel dispersant system,SioxX and SioxX-Quiek,have been studied in comparison with sodium hexametaphosphate (SHMP).SioxX is a dispersant for use in mierosilica containing castable systems and SioxX-Quick is an accelerator.Combined,they will enable the user to control set time accurately.When SHMP is replaced by SioxX,self-flow can be improved by 20 to 30％and shelf-life of dry premixes can be significantly improved as well.The mechanical properties such as cold crushing strength (CCS),cold modulus of rupture (COR) and hot modulus of rupture (HMOR) of the specimens were measured after heat-treatment at different temperatures.Substitution of the dispersant package leads not only to better flow and improved shelf life of the tested castable compositions,but also to improved mechanical properties at elevated temperatures.