基于核磁技术的微生物矿化风沙土材料微观特性研究
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内蒙古工业大学

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TU441+.5

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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项目(2022YFSH0047)


Study on the microscopic characteristics of microbial mineralized aeolian sandy soil materials based on nuclear magnetic technology
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Inner Mongolia University of Technology

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    摘要:

    为探究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T2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。

    Abstract:

    In order to explore the durability of 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 showed good stability, and the porosity increment decreased by about 1.8 times and 1.1 times, respectively, compared with the conventional MICP material.Under high and low temperature cycling and UV irradiation, the crystal structure of calcium carbonate was altered and the percentage of medium-sized pores in the soil increased, causing the 2nd peak of the T2 spectra of all three materials to be higher than the pre-test peak.The test shows that thepolymer 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.

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高瑜,邢家伟,王晓荣,等. 基于核磁技术的微生物矿化风沙土材料微观特性研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-12-12
  • 最后修改日期:2024-07-04
  • 录用日期:2024-07-09
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