EICP固化轮胎颗粒混合黏土的强度特性及微观机理  

Mechanical properties and microscopic mechanisms of enzyme-induced calcium carbonate precipitation(EICP)-reinforced clay mixtures with rubber particles

作　　者：马强 李蒙 周鑫隆 习磊 孙君 MA Qiang;LI Meng;ZHOU Xinlong;XI Lei;SUN Jun(College of Civil Engineering,Architecture and Environment,Hubei University of Technology,Wuhan 430068,China;Hubei Key Laboratory of Environmental Geotechnology and Ecological Remediation for Lake&River,Hubei University of Technology,Wuhan,430068,China;Sinohydro Four Bureau Huazhong(Wuhan)Engineering Co,Wuhan 430000,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,湖北武汉430068 [2]环境岩土与河湖生态修复湖北省重点实验室,湖北武汉430068 [3]中水电四局华中(武汉)工程有限公司,湖北武汉430000

出　　处：《岩土工程学报》2024年第S02期72-76,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52078194);湖北省杰出青年科学基金项目(2022CFA043);湖北省高校优秀中青年科技创新团队项目(T2022010)。

摘　　要：酶诱导碳酸钙沉淀(EICP)技术固化轮胎颗粒混合黏土轻质回填材料可以高效吸纳废旧轮胎,推动废旧轮胎在岩土工程领域资源化利用。基于EICP技术结合轮胎颗粒,系统开展了复合改良黏土的强度特性和机理研究。结果表明,EICP技术可以提高轮胎颗粒混合黏土的无侧限抗压强度。当胶结液浓度为0.5 mol/L时,处理效果最好。随着胶结液浓度增大,CaCO_(3)含量逐渐增加,但转化率逐渐降低。EICP固化轮胎颗粒混合黏土的强度和弹性模量随轮胎颗粒掺量增加先增加后降低,轮胎颗粒的最佳掺量为5%;微观结构分析表明EICP生成的CaCO_(3)有效增强了轮胎颗粒和土颗粒之间的黏结并填充了孔隙。研究结果可为EICP固化轮胎颗粒混合黏土填充材料提供理论依据。The utilization of enzyme-induced carbonate precipitation(EICP)to enhance the strength of rubber particles mixed with clay as lightweight backfill materials can effectively absorb waste tires and promote the sustainable utilization of rubber particles in geotechnical engineering.In this study,the strength characteristics and mechanism of the composite-modified clay are systematically investigated using the EICP technique combined with rubber particles.The results show that the EICP treatment can improve the unconfined compressive strength of the mixed clay with tire particles,and the best treatment effect was achieved when the concentration of the cementation solution is 0.5 mol/L.As the concentration of cementation solution increases,the CaCO3 content also increases,but the conversion rate decreases.The strength and modulus of elasticity of the EICP-treated clay mixed with rubber particles first increase and then decrease with the content of rubber particles,and the optimal content of rubber particles is 5%.The optimal amount of rubber particles to incorporate is 5%.The microstructural analysis reveals that the CaCO3 produced by the EICP significantly improves the bonding between rubber particles and soil particles,while also filling the pores.The results of the study can provide a theoretical basis for the utilization of the EICP-treated rubber particles mixed with clay as filling materials.

关 键 词：酶诱导碳酸钙沉淀 轮胎颗粒 力学特性 微观机理 

分 类 号：TU472[建筑科学—结构工程]