Effect of sticky rice on the strength and permeability of bio-cemented sand

Abstract

Microbially induced carbonate precipitation (MICP) is an eco-friendly soil improvement technique. However, this method still has some drawbacks, such as low conversion efficiency of CaCO₃ crystallization, insufficient strength for certain applications, and requiring multiple treatments. Previous studies have reported that sticky rice can regulate CaCO₃ crystals (i.e., chemical CaCO₃) in the sticky rice-lime mortar, showing potential for improving the bio-cementation. Therefore, this study explored the possibility of using sticky rice to enhance the biocementation effect. Tests were carried out to assess the strength and permeability of bio-cemented sand with the inclusion of sticky rice. The results indicated that sticky rice may regulate the type and size of bio-CaCO₃ crystals, and the use of an appropriate amount of sticky rice as additive could increase the strength of sand columns by regulating CaCO₃ crystallization. Polyhedral calcites may be more favourable for the increasing strength than some vaterites with a hollow spherical structure. The combination of MICP and sticky rice can significantly decrease the coefficient of permeability to a value that was much lower than that by using sticky rice and MICP alone. Bio-CaCO₃ immobilized the sticky rice on one end on sand particles, and the reticulated structure of sticky rice divided large pores into small pores, which may be the important cause of the decrease in permeability coefficient. Finally, this study proposed that the MICP with the sticky rice as an additive may enhance the MICP effect and prevent the surface erosion of coarse-grained sand slopes.

Keywords

Microbially induced carbonate precipitation / Sticky rice / Sand column / Unconfined compressive strength / Coefficient of permeability

CRediT authorship contribution statement

Qiyong Zhang: Writing - review & editing, Writing - original draft, Methodology, Investigation, Funding acquisition, Conceptualization. Jian Chu: Writing - review & editing, Writing - original draft, Methodology, Conceptualization. Zheng Zhang: Writing - original draft, Investigation. Wenhao Wang: Investigation. Shifan Wu: Conceptualization.

Declaration of Competing Interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. Jian Chu is the Editor-in-chief for Biogeotechnics and Shifan Wu is the editorial board member of Biogeotechnics, they were not involved in the editorial review or the decision to publish this article.

Acknowledgments

This work was supported by the State Scholarship Fund from the China Scholarship Council (CSC) No. 202006180076.

Disclosure

No potential conflict of interest was reported by the authors.

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