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

Xin Yang, Meng-qiu Yan, Jia-nan Zheng

Journal of Central South University ›› 2024, Vol. 31 ›› Issue (2) : 636-648. DOI: 10.1007/s11771-024-5585-8

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

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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.

Keywords

EICP / acid corrosion / calcium carbonate cementation / pore structure

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Xin Yang, Meng-qiu Yan, Jia-nan Zheng. Acid corrosion micro-macro mechanism of enzyme-induced carbonate precipitation (EICP) treated sandy soils. Journal of Central South University, 2024, 31(2): 636‒648 https://doi.org/10.1007/s11771-024-5585-8

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