High fire stability cement composite cementitious material based on semi‐dry gas desulfurized ash/blast furnace slag system: The synergistic effect of nano‐TiO₂ and nano‐SiO₂

Abstract

Cement is an important way to digest industrial waste. Semi-dry gas desulfurized ash (SGDA) and granulated blast furnace slag (GBFS) as solid waste both have pozzolanic activity as well as small particle size and continuous particle size distribution, which allow their use as cement mixtures. In the present work, a cement matrix with 60% Portland cement, 20% SGDA, and 20% GBFS, including 3% nano-TiO 2 and 2% nano-SiO 2 as dopants, was produced via cement slurry mixing process. The obtained matrix was found to have the better 3-and 28-day age compressive strength (by 104% and 116%, respectively) as compared with the pure Portland cement; the mortar compressive strength is