Performance analysis of industrial by-product modified calcium Sulphoaluminate cement based on RSM
XUE Jianfei1,2, LIANG Bing1, HE Xingxing2,3, TIAN Duowen4, FENG Dianzhi1,2, SHU Libing2, WAN Yong2,3*
1. School of Mechanics & Engineering, Liaoning Technical University, Fuxin, Liaoning 123000, China;2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China;3. Hubei Provincial Engineering Research Center of Safety Treatment and Ecological High-value of MSW, Wuhan, Hubei 430071, China;4. Wuhai Energy Co., Ltd., CHN Energy Group, Wuhai, Inner Mongolia 016000, China
Abstract：To investigate the pattern of influence of industrial by-products such as flue gas desulfurization gypsum(FGDG), fly ash(FA), and limestone(LS)on the strength and pH of calcium sulphoaluminate cement(SAC), FGDG, FA, and LS were used as solid waste admixture to modify SAC clinker and the modified SAC cured for 7 d and 28 d was tested for unconfined compressive strength(UCS)and pH. Response surface methods(RSM)were also used to develop regression models for the UCS and pH of the modified SAC. The effect patterns of each factor on UCS and pH were analyzed. The results of the study showed that both the UCS and pH of the modified SAC are influenced by the single and multifactorial effects of FGDG, FA, and LS. The interaction between FGDG and LS, LS and FA has a significant effects on UCS7 d and UCS28 d. The interaction between LS and FA, FGDG and FA has a significant effects on pH7 d, but not on pH28 d. The RSM-BBD multi-objective optimization method were used to optimize industrial by-products, the established regression model has high reliability and accuracy, and the optimal addition ratio meeting the requirements of high strength and low alkalinity is obtained, and the error of the test and the predicted values was small under this ratio.
