Study on Crystallization Effect of New Immobilized Materials

LI Tao; LAI Xiaoying; HUANG Hao; YANG Hanqing; DENG Bofan; WANG Yajun

doi:10.13204/j.gyjzG21112407

Volume 52 Issue 11

Nov. 2022

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LI Tao, LAI Xiaoying, HUANG Hao, YANG Hanqing, DENG Bofan, WANG Yajun. Study on Crystallization Effect of New Immobilized Materials[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(11): 84-90. doi: 10.13204/j.gyjzG21112407

Citation:

LI Tao, LAI Xiaoying, HUANG Hao, YANG Hanqing, DENG Bofan, WANG Yajun. Study on Crystallization Effect of New Immobilized Materials[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(11): 84-90. doi: 10.13204/j.gyjzG21112407

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Study on Crystallization Effect of New Immobilized Materials

doi: 10.13204/j.gyjzG21112407

1. School of Marine Engineering Equipment, Zhejiang Ocean University, Zhoushan 316000, China;
2. Shanghai Urban Construction Vocational College, Shanghai 200438, China

Received Date: 2021-11-24

Abstract

Abstract

Aiming at the crystallization effectiveness of the microbial self-healing technology for concrete cracks, and to improve the efficiency of microbial crystallization, a new material, namely calcareous sand of coral reefs, was used to immobilize microorganisms, and the superiority of calcareous sand of coral reefs to repair cracks in concrete and crystallization effect in the practice engineering was verified was verified by means of an impermeability test. The physical and mechanical properties of calcareous sand of coral reefs were analyzed, which had a water absorption ratio of 17%, a crushing value of 26%, and the calcium carbonate content more than 97%. The study showed that calcareous sand of coral reefs was of learger porosity and specific surface areas. It was good living space and an ideal immobilized material for microorganisms. Sporosarcina pasteurii were immobilized in calcareous sand of coral reefs, and the impermeability test for self-healing concrete cracks were subsequently implemented. The study results revealed that after immobilization and self-renovation, the gas penetration decreased by 10%, the permeability coefficient decreased by 2 orders of magnitude. In addition, calcite-type calcium carbonate crystal precipitates filling in cracks by SEM scanning were observed, and microbially generated calcite calcium carbonate crystal sediments were observed by the carbon-iostope ratio determination analysis in repaired cracks in practice engineering. The study showed that the immobilization of calcareous sand of coral reefs played a good role in protecting microorganisms, which improved the efficiency of microbial crystallization and effectively ameliorated the pore characteristics and structure of concrete cracks.
- immobilized materials,
- microorganism,
- self-healing,
- effectiveness of crystallization

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References(29)

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