Experimental and mechanism exploration of alkali-silica reaction inhibition by microbial mineralization

ZHENG Yulong; LIN Hongru; LU Chunhua; WANG Jingquan

doi:10.13801/j.cnki.fhclxb.20240013.001

Volume 41 Issue 8

Aug. 2024

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ZHENG Yulong, LIN Hongru, LU Chunhua, et al. Experimental and mechanism exploration of alkali-silica reaction inhibition by microbial mineralization[J]. Acta Materiae Compositae Sinica, 2024, 41(8): 4225-4235. doi: 10.13801/j.cnki.fhclxb.20240013.001

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ZHENG Yulong, LIN Hongru, LU Chunhua, et al. Experimental and mechanism exploration of alkali-silica reaction inhibition by microbial mineralization[J]. Acta Materiae Compositae Sinica, 2024, 41(8): 4225-4235. doi: 10.13801/j.cnki.fhclxb.20240013.001

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Experimental and mechanism exploration of alkali-silica reaction inhibition by microbial mineralization

doi: 10.13801/j.cnki.fhclxb.20240013.001

Faculty of Civil Engineering Mechanics, Jiangsu University, Zhenjiang 212013, China

Funds: National Natural Science Foundation of China (52108147; 51878319); Jiangsu Planned Projects for Postdoctoral Research Funds (2020Z350); Senior Talent Foundation of Jiangsu University (20JDG19)

Received Date: 2023-10-20
Accepted Date: 2024-01-05
Rev Recd Date: 2023-12-23

Available Online: 2024-01-15

Publish Date: 2024-08-01

Abstract

Abstract

Alkali-silica reaction (ASR) is a reaction between alkaline pore solutions in concrete and reactive non-crystalline SiO₂ in aggregates, which leads to expansion and cracking of the concrete, and degradation of mechanical properties. In this study, based on the microbial induced calcium carbonate precipitation (MICP) technique of Bacillus pasteurus, various treatment frequencies and methods, including surface treatments of potentially active aggregates and mortar bars made by them, to comprehensively evaluate the inhibition law and mechanism of MICP on ASR. The results showed that the MICP treatment could form a dense CaCO₃ layer with adhesive effect on the surface of aggregates and mortar bars, thus preventing the intrusion of alkaline ions and water, and the inhibiting effect became stronger with the treatment numbers. Compared with the control group, the maximum increase in mechanical properties of 13.8%, and the decrease in expansion rate of 35% were observed when the mortar bars were treated. When treating the aggregate, the mechanical properties were improved by 25.3% and the expansion rate was reduced by 59.6% with a better inhibition effect, as the surface CaCO₃ layer could simultaneously block the alkaline ions and water existing in the pore solution and invading from outside. Microstructural and compositional analyses showed that the proportion of Si and Na atoms on the aggregate surface decreased by 69.6% and 88.9%, respectively, after treatment, indicating a significant reduction in the ASR gel.
- MICP,
- alkali-silica reaction,
- Jinping sandstone,
- mechanical properties,
- expansion rate
Long Abstrsct
Innovation Points

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References(46)

References

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