微生物与水泥固化南海珊瑚砂的强度及微观特征对比试验
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TU473

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国家自然科学基金(51578214)


Comparative Experiment on Mechanical Properties of Microbe Cured and Cement Cured Coral Sand
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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    近年来微生物诱导碳酸钙沉积技术(MICP)在土体加固领域受到广泛关注,但对MICP技术和水泥固化珊瑚砂的力学特性对比研究尚不充分。为了对比MICP珊瑚砂砂样和珊瑚砂水泥砂浆试样的力学特性,本试验分析了两者的破坏形式和应力应变曲线,并通过SEM试验比较了两者的微观结构。试验结果表明:当试样内部碳酸钙/水泥含量少于15%时,MICP试样的无侧限抗压强度要显著高于水泥砂浆试样,尤其是碳酸钙含量为5.3%、7.7%、9.1%时,MICP试样的无侧限强度为相应水泥砂浆试样强度的200%以上;当碳酸钙/水泥含量高于15%时,二者强度差值在5%以内。同时,MICP试样和珊瑚砂水泥砂浆试样的微观结构存在明显差异性。

    Abstract:

    In recent years, the microbial induced calcium carbonate precipitation (MICP) technology has received widespread attention in the field of the soil reinforcement. However, the comparative study on the mechanical properties of the MCP technology and the cement-solidified coral sand is still insufficient. In this test, in order to compare the mechanical properties of the MICP coral sand sample and the coral sand cement mortar sample, the failure form and the stress-strain curve of the two samples are analyzed, and their microstructures are compared through the SEM test. The test results reveal as follows: when the calcium carbonate/cement content inside the sample is less than 15%, the unconfined compressive strength of the MICP sample is significantly higher than that of the cement mortar sample; especially, when the calcium carbonate content is 5.3%, 7.7%, and 9.1%, the unconfined strength of the MICP sample is more than 200% of the strength of the corresponding cement mortar sample; when the calcium carbonate/cement content is higher than 15%, the difference between the two strengths is within 5% is within 5%. Meanwhile, there are apparent differences in the microstructure of the MICP sample and the coral sand cement mortar sample.

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许鹏旭,冷勐,彭劼,等. 微生物与水泥固化南海珊瑚砂的强度及微观特征对比试验[J]. 科学技术与工程, 2022, 22(16): 6642-6649.
Xu Pengxu, Leng Meng, Peng Jie, et al. Comparative Experiment on Mechanical Properties of Microbe Cured and Cement Cured Coral Sand[J]. Science Technology and Engineering,2022,22(16):6642-6649.

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  • 收稿日期:2021-09-03
  • 最后修改日期:2022-03-03
  • 录用日期:2021-12-26
  • 在线发布日期: 2022-06-22
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