Study on the influence mechanism of calcination time on cementitious activity of coal gangue-based grouting material
HU Xiaoyu
WANG Xiaodong
ZHU Shibin
WU Boqiang
ZHANG Yuehong
HAN Le
XU Chen
Abstract：In order to improve the activity of coal gangue as a key cementitious component in grouting materials,this study investig-ated coal gangue calcined at different durations under 800 ℃.The coal gangue-based geopolymers were prepared through alkaline activation,and their compressive strength,X-ray diffraction(XRD)patterns,and Fourier transform infrared(FTIR)spectra were ana-lyzed to systematically elucidate the effect of calcination time on the gelling activity of coal gangue.The results indicated that coal gangue exhibited higher gelling activity after 2 hours of calcination but underwent a notable decline at 4 hours,followed by a gradu-al increase after 6 hours;calcination facilitated the transformation of kaolinite in coal gangue into reactive amorphous metakaolin,whereas prolonged calcination led to the conversion of metakaolin into less active mullite;additionally,the reduction of residual car-bon during calcination contributed to the gradual recovery of gelling activity.
Keywords：coal ganguecalcination timecementitious activitygeopolymersgrouting material
Publication Date：2025-05-31
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 153-158 )