摘要
为探究微生物诱导碳酸钙沉淀(microbially induced calcite precipitation,MICP)技术矿化改良风沙土材料的耐久性,采用0.08%高分子吸水树脂(MICP+A)和0.37%黄原胶(MICP+B)对传统MICP材料改良。通过核磁共振技术对不同周期的高低温循环和紫外照射两种环境下的微观结构进行研究,考察矿化风沙土材料的耐久性。结果表明,MICP+A材料和MICP+B材料孔隙度均随循环周期的增加而上升;在20个周期的高低温循环试验和15个周期的紫外线照射试验,MICP+A材料均表现出良好的耐久性,与传统MICP材料相比孔隙度增量分别下降约1.8倍和1.1倍;在高低温循环和紫外线照射下,碳酸钙晶体结构发生改变,土体的中等粒径孔隙占比增加,使3种材料的T_2谱第2个峰均高于试验前的峰值。试验表明高分子吸水树脂能够提高传统MICP试件的耐久性能,此研究为微生物矿化岩土材料在沙漠地区治理的工程应用提供基础实验依据。
In order to explore the durability of microbially induced calcite precipitation(MICP)technology to improve the durability of aeolian sandy soil materials,0.08%polymer absorbent resin(MICP+A)and 0.37%xanthan gum(MICP+B)were used to improve the traditional MICP materials.The microstructure of different cycles of high and low temperature cycle and ultraviolet irradiation was studied by nuclear magnetic resonance technology,and the durability of mineralized sandy soil materials was investigated.The results show that the porosity of both MICP+A and MICP+B materials increases with the increase of cycling cycles.In 20 cycles of high and low temperature cycling tests and 15 cycles of ultraviolet irradiation tests,the MICP+A material shows good stability,and the porosity increment decreases by about 1.8 times and 1.1 times,respectively,compared with the conventional MICP material.Under high and low temperature cycling and ultraviolet irradiation,the crystal structure of calcium carbonate is altered and the percentage of medium-sized pores in the soil increases,causing the 2nd peak of the T2 spectra of all three materials to be higher than the pre-test peak.The test shows that the polymer water-absorbing resin can improve the stability performance of the traditional MICP specimens,and this study provides a basic experimental basis for the engineering application of microbial mineralized geotechnical materials in the treatment of desert areas.
作者
高瑜
邢家伟
王晓荣
韩红伟
樊促遥
GAO Yu;XING Jia-wei;WANG Xiao-rong;HAN Hong-wei;FAN Cu-yao(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Inner Mongolia Engineering Research Center of Geological Technology and Geotechnical Engineering,Hohhot 010051,China;Key Laboratory of Geological Hazards and Geotechnical Engineering Defense in Sandy and Drought Regions at Universities of Inner Mongolia Autonomous Region,Inner Mongolia University of Technology,Hohhot 010051,China)
出处
《科学技术与工程》
北大核心
2025年第5期2066-2073,共8页
Science Technology and Engineering
基金
国家自然科学基金(12262031)
内蒙古自治区科技计划关键技术攻关项目(2021GG0344)
内蒙古自治区科技计划(2022YFSH0047)。
关键词
生物岩土
微生物矿化风沙土材料
MICP
核磁共振实验
高低温循环
紫外照射试验
biogeotechnical rock
microbial mineralization of sandy soil materials
MICP
NMR experiment
high and low temperature cycle
ultraviolet irradiation test
