砂质土与建筑垃圾制备可控性低强度材料  

Preparation of controlled low strength materials with sandy soils and construction waste

作　　者：李晓静[1] 王玉卿 王宁宁 陈徐东[3] 包益鋆 张文文 余巍 LI Xiaojing;WANG Yuqing;WANG Ningning;CHEN Xudong;BAO Yijun;ZHANG Wenwen;YU Wei(School of Civil Engineering,Shandong Jianzhu University,Ji'nan 250101,China;Nanjing Sanhejian Environmental Technology Co.Ltd.,Nanjing 210000,China;College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China;School of Environmental Science and Engineering,Changzhou University,Changzhou 213164,China;Nanjing SEU Geotechnical Engineering Investigation and Design Research Institute Co.Ltd.,Nanjing 210000,China)

机构地区：[1]山东建筑大学土木工程学院,山东济南250101 [2]南京三合建环保科技有限公司,江苏南京210000 [3]河海大学土木与交通学院,江苏南京210098 [4]常州大学环境科学与工程学院,江苏常州213164 [5]南京东大岩土工程勘察设计研究院有限公司,江苏南京210000

出　　处：《新型建筑材料》2024年第8期107-111,共5页New Building Materials

基　　金：国家自然科学基金项目(52372028,51979090,52379124)。

摘　　要：利用砂质土与建筑垃圾细骨料复掺制备可控性低强度材料(CLSM),研究了砂质土与建筑垃圾细骨料不同质量比下CLSM的流动度、泌水率、凝结时间和抗压强度的变化规律,并通过XRD和SEM探究物相组成和微观形貌。结果表明,随着砂质土与建筑垃圾细骨料质量比的降低,CLSM的泌水率及流动度减小、凝结时间缩短、抗压强度提高。利用砂质土与建筑垃圾细骨料复掺解决了泌水率高的问题,且当两者质量比为1∶1时,流动度、泌水率、凝结时间和抗压强度符合市政管道回填施工要求。Controlled low strength material(CLSM)was prepared by mixing sandy soil and fine aggregate from construction waste,and the variation rules of fluidity,bleeding rate,setting time and compressive strength of CLSM were investigated under different mass ratios of sandy soil and fine aggregate from construction waste.The physical composition and micro-morphology of CLSM were investigated by XRD and SEM.The results show that with the decrease of the mass ratio of sandy soil and construction waste fine aggregate,the bleeding rate and fluidity of CLSM decrease,the setting time shortens,and the compressive strength increases.The problem of high bleeding rate was solved by mixing sandy soil with fine aggregate of construction waste,and when the mass ratio of the two was 1∶1,the fluidity,bleeding rate,setting time and compressive strength were in line with the requirements of municipal pipeline backfill construction.

关 键 词：可控性低强度材料 砂质土 建筑垃圾细骨料 物理性能 微观结构 

分 类 号：TU521[建筑科学—建筑技术科学]