Combined effect of coal chemical wastewater and PC on preparing of coal-to-liquids residue-based alkali activated materials

Aimed to achieve “waste control by waste” of coal-to-liquids (CTL) industry, coal gasification residue (CGR), the most typical CTL residue, and chemical wastewater (CCW) were used as aluminosilicate precursor auxiliary activator respectively prepare alkali activated materials (AAMs). CGR-based AAMs using a less concentrated NaOH solution than conventional, with CCW mixing water synthesized. The results showed that benefited compressive strength significantly, but demonstrating slight reduction over time. combined effect Portland cement (PC) supplied continuous increase eliminated age. mechanisms behind improved performance due introduction PC discussed XRD, FTIR, TG-DSC, MIP ESEM. It was found increased content CCW, more extensive dissolution active progressive geopolymerization CGR. coexistence both N-A-S-H gel C-A-S-H (originated from introduced PC) in hardened AAM pastes reduced proportion pores larger 100 nm 30%, provided denser structure.