Author(s)

Kai Guo ¹, Fan Yang ¹

Affiliation(s)

¹ School of Civil Engineering, Shenyang University of Architecture, Shenyang, Liaoning, 110168, China

Corresponding Author

Kai Guo

ABSTRACT

Based on the characteristics of sparse and porous surface of recycled aggregate, this paper used recycled aggregate as a carrier to prepare microbial concrete by solid loading of Bacillus subtilis, and treated with kaolinite geopolymer for external wrapping to indirectly evaluate the difference of crack repair effect by capillary water absorption. The results showed that the water absorption of the untreated recycled aggregate was 6.17%, and the water absorption of the recycled aggregate was 8.94% after the treatment with metakaolin; after 28 d repair, the cumulative water absorption of the two groups of solid-loaded microbial concrete treated with recycled aggregate and external wrapping was significantly reduced compared with that of the direct bacteria-doped group; with the extension of the repair time, the initial water absorption of the three groups S1 gradually decreased, and the later water absorption S2 still showed a general trend of gradual decrease. The ratio of S1 / S2 water absorption of the three groups basically showed a decreasing pattern; due to the volcanic ash effect of the metakaolin, the ratio of S1 / S2 between the initial and late water absorption of the recycled aggregates treated with metakaolin increased.

KEYWORDS

Recycled aggregates, carrier species, microorganisms, self-healing concrete, capillary water absorption

CITE THIS PAPER

Kai Guo, Fan Yang, Research on Crack Repair Based on Reclaimed Aggregate Supported Microbial Concrete. Bridge and Structural Engineering (2023) Vol. 1: 1-6. DOI: http://dx.doi.org/10.23977/bridse.2023.010101.

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