循环流化床粉煤灰基泡沫轻质土的制备及其耐久性研究  

Preparation of circulating fluidized bed fly ash-based foamed lightweight soil and its durability properties

作　　者：赵帆 郭聪林 张宏 周冬冬 段思宇 马志斌 ZHAO Fan;GUO Conglin;ZHANG Hong;ZHOU Dongdong;DUAN Siyu;MA Zhibin(Institute of Resources and Environmental Engineering,Shanxi University,Taiyuan 030006,China;Shanxi Road and Bridge Construction Group Co.Ltd,Taiyuan 030031,China;Shanxi Road and Bridge Renewable Resources Development Co.Ltd,Taiyuan 030032,China)

机构地区：[1]山西大学资源与环境工程研究所,山西太原030006 [2]山西路桥建设集团有限公司,山西太原030031 [3]山西路桥再生资源开发有限公司,山西太原030032

出　　处：《新型建筑材料》2024年第9期41-47,68,共8页New Building Materials

基　　金：山西省科技攻关计划项目(202202090301021);山西省基础研究计划资助项目(202103021223268);2023年度襄垣县固废综合利用科技攻关项目(2023-03)。

摘　　要：为促进循环流化床粉煤灰(CFBFA)、赤泥(RM)等固废实现大宗消纳,以其为主要原料辅以钢渣(SS)、脱硫石膏(DG)制备了循环流化床粉煤灰基泡沫轻质土(CBFLS),分析了浆体的流动度和CBFLS力学性能,通过吸水率、干湿循环、冻融循环和抗硫酸盐侵蚀的实验测试其耐久性,通过醋酸溶液浸出实验评估其环境安全性。结果表明,当原料配比m(CFBFA)∶m(RM)∶m(SS)∶m(DG)=47.5∶28.5∶19∶5时,900 kg/m^(3)的试块7、28 d强度分别为1.28、1.45 MPa,可以满足路床部位施工要求。CBFLS耐久性良好,并且可以有效固化Na+和其他重金属离子,浸出结果符合GB 5749—2022《生活饮用水卫生标准》的要求。In order to promote the realization of bulk elimination of solid wastes such as circulating fluidized bed fly ash(CFBFA)and red mud(RM),CFBFA-based foamed lightweight soil(CBFLS)was prepared by using both of them as the main raw materials,mixed with steel slag(SS)and desulphurized gypsum(DG),the fluidity of the slurry and the mechanical properties of the CBFLS were analyzed,the durability was tested by the experiments of volumetric water absorption,dry and wet cycles,freeze and thaw cycles,and the resistance to sulphate attack,the environmental safety was assessed by leaching experiments with acetic acid solution.The results show that when m(CFBFA)∶m(RM)∶m(SS)∶m(DG)=47.5∶28.5∶19∶5,the 7 d and 28 d strength of 900 kg/m^(3) specimen is 1.28 MPa and 1.45 MPa,respectively,which can meet the requirements of road bed construction.The CBFLS has good durability and can effectively solidify Na+and other heavy metal ions,and the leaching results meet the GB 5749—2022 standard.

关 键 词：工业固废 泡沫轻质土 流动度 抗压强度 耐久性 环境安全性 

分 类 号：TU528.09[建筑科学—建筑技术科学]