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Acid corrosion micro-macro mechanism of enzyme-induced carbonate precipitation (EICP) treated sandy soils

酶诱导碳酸钙沉淀(EICP)固化砂土酸蚀宏细观机理

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Abstract

Carbon dioxide (CO2) geological sequestration is an effective way to control CO2 emissions, and the geological safety in CO2 injection project is the most concern problem. Enzyme-induced carbonate precipitation (EICP) technique is believed as useful to overcome CO2 leakage problem, but its main cementation matter, calcium carbonate, may be corroded by acidic CO2 solution. Therefore, laboratory studies are necessary to investigate the acid corrosion and resistance of EICP treated sandy soils. In this study, the EICP specimens were immersed in acid solutions with different concentrations, and both mechanical strength and micro-macro structure were investigated based on mass loss, apparent analysis, unconfined compressive strength tests, SEM and XCT. The results indicate that the corrosive effect of acid solution on EICP specimens was obviously strengthened by the decrease in solution pH, the ablation of calcium carbonate destroyed the cementation-pore structure resulting in the gradual shedding of the outer layer of the specimens and the nearly linear decrease in unconfined compressive strength. After acid corrosion reaction, the EICP specimens were found with a large number of intergranular pores among calcium carbonate particles. This study reveals the evolution mechanism of acid corrosion of EICP specimens, providing a reference for the corrosion resistance of EICP.

摘要

二氧化碳地质封存是控制二氧化碳排放的有效措施,因此二氧化碳注入后地质安全问题备受关 注。当前,酶诱导碳酸钙沉淀(EICP)技术能够有效地解决二氧化碳泄露问题。二氧化碳注入后储层流 体呈酸性,对胶结物碳酸钙具有酸蚀作用。因此,亟需对EICP固化砂土耐酸蚀性开展试验研究。本研 究将EICP 试样浸泡在不同浓度酸溶液中,通过质量损失、表观分析、无侧限抗压强度、SEM和XCT 等对其力学强度和宏细观结构进行了研究。结果表明:酸溶液对EICP 试样的腐蚀作用随着溶液pH的 降低明显增强,并且碳酸钙胶结物酸蚀导致试样结构破坏,试样外层逐渐脱落,从而使试样无侧限抗 压强度近似线性下降。同时,酸蚀反应后EICP 试样出现大量粒间孔隙。本研究揭示了EICP 试样酸蚀 演化机理,为EICP耐腐蚀性提供参考。

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Authors and Affiliations

  1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, 310058, China

    Xin Yang  (杨昕)

  2. Ocean Academy, Zhejiang University, Zhoushan, 316021, China

    Meng-qiu Yan  (颜梦秋)

  3. Shanghai Institute for Advanced Study, Zhejiang University, Shanghai, 201203, China

    Jia-nan Zheng  (郑嘉男)

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  1. Xin Yang  (杨昕)
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  2. Meng-qiu Yan  (颜梦秋)
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  3. Jia-nan Zheng  (郑嘉男)
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Correspondence to Jia-nan Zheng  (郑嘉男).

Additional information

Foundation item: Projects(52122906, 52306205) supported by the National Natural Science Foundation of China; Project (LHZ20E090001) supported by the Natural Science Foundation of Zhejiang Province, China

Contributors

YANG Xin developed the overarching research goals and wrote the draft of manuscript. YAN Meng-qiu conducted the literature review. ZHENG Jia-nan edited the manuscript.

Conflict of interest

YANG Xin, YAN Meng-qiu, and ZHENG Jia-nan declare that they have no conflict of interest.

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Yang, X., Yan, Mq. & Zheng, Jn. Acid corrosion micro-macro mechanism of enzyme-induced carbonate precipitation (EICP) treated sandy soils. J. Cent. South Univ. 31, 636–648 (2024). https://doi.org/10.1007/s11771-024-5585-8

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