多元固废胶凝材料在20和40℃固化洗砂余泥的研究  

Solidification of Sand Washing Residue Mud by Using Multivariant Solid Waste Cementitious Materials at 20 and 40℃

作　　者：高云楠 张领帅 侯莉 周永祥 GAO Yunnan;ZHANG Lingshuai;HOU Li;ZHOU Yongxiang(The College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;Shenzhen Hongyeji Geotechnical Technology Co.,Ltd,Shenzhen 518057,China;China City Sanitation Association Building Waste Management and Resource Utilization Work Committee,Beijing 100037,China;Geotechnical Stability and Solidification Technology Branch of China Concrete and Cement Products Association,Beijing 100831,China)

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]深圳宏业基岩土科技股份有限公司,深圳518057 [3]中国城市环境卫生协会建筑垃圾管理与资源化工作委员会,北京100037 [4]中国混凝土与水泥制品协会岩土稳定与固化技术分会,北京100831

出　　处：《硅酸盐通报》2025年第2期590-601,641,共13页Bulletin of the Chinese Ceramic Society

基　　金：国家重点研发计划(2023YFE0199600);国家自然科学基金(52378213)。

摘　　要：本研究利用矿渣、钢渣、赤泥、烧石膏及少量自制激发剂CH(以多种价态的碱混合而成)和NS(以多种易溶性硫酸盐和卤族盐混合而成)制备多元固废胶凝材料固化洗砂余泥,采用XRD、MIP和SEM等测试技术,研究了化学激发剂类型、胶凝材料掺量、养护温度(20和40℃)对洗砂余泥固化体抗压强度和微观结构的影响,并评估了其水稳性和重金属浸出特性。结果表明:单掺CH多元固废胶凝材料对洗砂余泥的固化效果最优,养护温度和多元固废胶凝材料掺量为40℃和40%时,7 d抗压强度可达5.57 MPa,软化系数为0.88;单掺NS多元固废胶凝材料对洗砂余泥的固化效果最差,原因是缺乏高碱环境,削弱了钙和铝的溶出,水化硅酸钙(C-S-H)和钙矾石(AFt)的生成量降低,孔隙率增高;而使用复掺CH-NS多元固废胶凝材料,会因为生成过量的膨胀性产物AFt而造成试样抗压强度降低。提高多元固废胶凝材料掺量和养护温度,可提高洗砂余泥固化体的抗压强度。单掺CH多元固废胶凝材料可使洗砂余泥固化体养护温度40℃的7 d抗压强度比20℃的7 d抗压强度增长169.08%。此外,洗砂余泥固化体的重金属(铁、锰、钛)浸出含量均符合环保性要求。This study used granulated blast furnace slag,steel slag,red mud,calcined gypsum and a small amount of self-synthesized activator CH(made by mixing multiple valence states of alkali)and NS(made by mixing various soluble sulfates and halogen salts)to prepare multivariate solid waste cementitious materials(MSWCM)to solidify sand washing residue mud.The effects of chemical activator type,cementitious material content and curing temperature(20 and 40℃)on the compressive strength and microstructure of the solidified body of sand washing residue mud were studied by XRD,MIP and SEM.The water stability and heavy metal leaching characteristics were evaluated.The results show that the MSWCM with addition of CH has the best curing effect on the sand washing residue mud.When the curing temperature and the content of MSWCM are 40℃and 40%,the 7 d compressive strength can reach 5.57 MPa,and the softening coefficient is 0.88.The solidification effect of sand washing residue mud is the worst for MSWCM with addition of NS,because of the lack of a high alkaline environment,which weakens the leaching of calcium and aluminum,reducing the generation of C-S-H and ettringite,and has a high porosity.The use of MSWCM with addition of CH-NS reduces the compressive strength of sample due to the formation of excessive expansion product AFt.By increasing the content of MSWCM and curing temperature,the compressive strength of solidified body of sand washing residue mud increases.The 7 d compressive strength of solidified body of sand washing residue mud at 40℃can be increased by 169.08%compared with the 7 d compressive strength at 20℃by MSWCM with addition of CH.In addition,the leaching content of heavy metals(iron,manganese,titanium)in the solidified body of sand washing residue mud meets the environmental protection requirements.

关 键 词：固废胶凝材料 洗砂余泥 养护温度 抗压强度 水稳性 重金属浸出 

分 类 号：TU526[建筑科学—建筑技术科学]