改性镁基固化剂固化工程弃土性能研究  

Study on Performance of Modified Magnesium-based Solidifying Agent for Engineering Waste Soil

作　　者：陈杰 吴春然[1] 寇世聪 CHEN Jie;WU Chun-ran;KOU Shi-cong(College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China;School of Civil Engineering and Transportation,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]深圳大学土木与交通工程学院,深圳518060 [2]广州大学土木与交通工程学院,广州510006

出　　处：《武汉理工大学学报》2024年第12期9-15,共7页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(52341801);深圳市科技创新委员会可持续发展专项(KCXFZ20201221173001003)。

摘　　要：我国建筑工程每年产生约20亿t工程弃土,综合利用率仅5%,填埋处置对环境和生活造成严重影响。采用氧化镁和硫酸镁制备镁基粘土固化剂,并添加柠檬酸和CaSO4晶须纤维改性,研究其固化弃土的性能。结果表明,固化剂与弃土质量比为2∶3时,固化土3 d和28 d强度分别为43.2 MPa和61.1 MPa。掺入60%弃土的试块浸水28 d后软化系数为0.64,仍具较高强度且无皴裂。MIP和SEM结果显示,改性剂生成的针棒状晶体填充微孔,提高了固化土的密实性并降低孔隙率。In China, construction projects generate nearly 2 billion tons of engineering waste soil annually, with a comprehensive utilization rate of only about 5%.The landfill disposal process severely impacts the environment and human life.This study prepares a magnesium-based clay stabilizer using magnesium oxide and magnesium sulfate as the main raw materials, modified with citric acid and CaSO_4 whisker fibers.The results indicate that when the mass ratio of solidifier to waste soil is 2∶3,the 3-day and 28-day strengths of the solidified soil are 43.2 MPa and 61.1 MPa, respectively.After 28 days of water immersion, samples containing 60% waste soil exhibited a softening coefficient of 0.64,maintaining high strength without surface cracking.MIP and SEM results showed that the needle-like crystals generated by the modifier filled the micropores, enhancing the compactness of the solidified soil and reducing its porosity.

关 键 词：镁基固化剂 工程弃土 抗压强度 耐水性能 孔结构 

分 类 号：TU5[建筑科学—建筑技术科学]