Optimization of Mineralization Curing System for Efficient and Safe Utilization of Steel Slag Wastes

作     者：YI Haihe ZHAN Qiwei YU Xiaoniu 伊海赫;ZHAN Qiwei;YU Xiaoniu

作者机构：School of Civil and Architectural EngineeringShandong University of TechnologyZibo 255000China School of Civil Engineering and ArchitectureJiangsu University of Science and TechnologyZhenjiang 212003China Department of Civil and Environmental EngineeringNanyang Technological UniversitySingapore City 639798Singapore 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2022年第37卷第4期

页      面：595-602页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：Funded by the National Natural Science Foundation of China(No.51972047) 

主　　题：steel slag microorganism bio-mineralization enzyme activity curing system 

摘      要：The crystal structure and morphology of the mineralization products were studied by scanning electron microscopy(SEM)and X-ray diffraction(XRD),and the thermal properties were studied by thermogravimetric-differential scanning calorimetry(DSC)*** changes of microorganism quantity and enzyme activity in pore solution with time were *** experimental results show that microorganism quantity and enzyme activity in pore solution reach the maximum at 50-60 h,mineralization curing begins at this time,the strength of microbial mineralized steel slag reaches the *** study provides a good selection basis for selecting the optimum mineralization system for the production of microbial mineralized steel slag *** mineralization can accelerate the rate of carbon sequestration in the mineralization *** compressive strength of steel slag with 1.5% bacterial can reach up to 55.6 *** microstructure and thermal properties of calcium carbonate precipitate induced by the enzymes of bacillus subtilis differs from the chemical precipitation in pore solution of steel *** the analysis of the mineralized products of steel slag,the reaction rate of free calcium oxide and free magnesium oxide in steel slag after the addition of microorganisms is significantly increased,which improves the stability of steel slag as cementitious ***,the production of calcium carbonate,the main mineralized product,is significantly increased.