The use of microbial induced carbonate precipitation in healing cracks within reactive magnesia cement-based blends

Shaoqin Ruan; Jishen Qiu; Yiwei Weng; Yang Yang; En Hua Yang; Jian Chu; Cise Unluer

doi:10.1016/j.cemconres.2018.10.018

The use of microbial induced carbonate precipitation in healing cracks within reactive magnesia cement-based blends

Shaoqin Ruan, Jishen Qiu, Yiwei Weng, Yang Yang, En Hua Yang, Jian Chu, Cise Unluer

Research output: Journal article publication › Journal article › Academic research › peer-review

114 Citations (Scopus)

Abstract

This study investigated the feasibility of crack healing by means of microbial induced carbonate precipitation (MICP) in reactive magnesia cement (RMC)-based blends. Pre-cracked samples were subjected to four different healing conditions involving air, water and two different bacteria-urea concentrations. Resonance frequency measurements revealed the recovery of samples under different conditions. μ-CT, SEM-EDX, XRD and pH measurements were used to investigate the type and contents of healing products within the cracks. Different types of hydrated magnesium carbonates (HMCs) formed under each bacteria-urea solution due to differences in pH associated with bacteria-urea concentrations. While these phases first formed on top of the cracks, investigation of the crack depth revealed the presence of precipitates at inner sections, albeit at lower contents. The adopted MICP approach leading to the production of HMCs was an effective method for healing cracks in RMC-based samples, resulting in a high extent of healing in a short time period.

Original language	English
Pages (from-to)	176-188
Number of pages	13
Journal	Cement and Concrete Research
Volume	115
DOIs	https://doi.org/10.1016/j.cemconres.2018.10.018
Publication status	Published - Jan 2019
Externally published	Yes

Keywords

Bacteria
Crack (B)
MgO (D)
Microstructure (B)
pH (A)
Self-healing

ASJC Scopus subject areas

Building and Construction
General Materials Science

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10.1016/j.cemconres.2018.10.018

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title = "The use of microbial induced carbonate precipitation in healing cracks within reactive magnesia cement-based blends",

abstract = "This study investigated the feasibility of crack healing by means of microbial induced carbonate precipitation (MICP) in reactive magnesia cement (RMC)-based blends. Pre-cracked samples were subjected to four different healing conditions involving air, water and two different bacteria-urea concentrations. Resonance frequency measurements revealed the recovery of samples under different conditions. μ-CT, SEM-EDX, XRD and pH measurements were used to investigate the type and contents of healing products within the cracks. Different types of hydrated magnesium carbonates (HMCs) formed under each bacteria-urea solution due to differences in pH associated with bacteria-urea concentrations. While these phases first formed on top of the cracks, investigation of the crack depth revealed the presence of precipitates at inner sections, albeit at lower contents. The adopted MICP approach leading to the production of HMCs was an effective method for healing cracks in RMC-based samples, resulting in a high extent of healing in a short time period.",

keywords = "Bacteria, Crack (B), MgO (D), Microstructure (B), pH (A), Self-healing",

author = "Shaoqin Ruan and Jishen Qiu and Yiwei Weng and Yang Yang and Yang, {En Hua} and Jian Chu and Cise Unluer",

note = "Funding Information: The authors would like to acknowledge the financial support from the Singapore MOE Academic Research Fund Tier 1 ( RG 95/16 ) for the work performed by Shaoqin Ruan and Cise Unluer. The support from MOE Academic Research Fund Tier 2 ( MOE2015-T2-142 ) is also acknowledged for the work performed by Yang Yang and Jian Chu. Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

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AU - Ruan, Shaoqin

AU - Qiu, Jishen

AU - Weng, Yiwei

AU - Yang, Yang

AU - Yang, En Hua

AU - Chu, Jian

AU - Unluer, Cise

N1 - Funding Information: The authors would like to acknowledge the financial support from the Singapore MOE Academic Research Fund Tier 1 ( RG 95/16 ) for the work performed by Shaoqin Ruan and Cise Unluer. The support from MOE Academic Research Fund Tier 2 ( MOE2015-T2-142 ) is also acknowledged for the work performed by Yang Yang and Jian Chu. Publisher Copyright: © 2018 Elsevier Ltd

PY - 2019/1

Y1 - 2019/1

N2 - This study investigated the feasibility of crack healing by means of microbial induced carbonate precipitation (MICP) in reactive magnesia cement (RMC)-based blends. Pre-cracked samples were subjected to four different healing conditions involving air, water and two different bacteria-urea concentrations. Resonance frequency measurements revealed the recovery of samples under different conditions. μ-CT, SEM-EDX, XRD and pH measurements were used to investigate the type and contents of healing products within the cracks. Different types of hydrated magnesium carbonates (HMCs) formed under each bacteria-urea solution due to differences in pH associated with bacteria-urea concentrations. While these phases first formed on top of the cracks, investigation of the crack depth revealed the presence of precipitates at inner sections, albeit at lower contents. The adopted MICP approach leading to the production of HMCs was an effective method for healing cracks in RMC-based samples, resulting in a high extent of healing in a short time period.

AB - This study investigated the feasibility of crack healing by means of microbial induced carbonate precipitation (MICP) in reactive magnesia cement (RMC)-based blends. Pre-cracked samples were subjected to four different healing conditions involving air, water and two different bacteria-urea concentrations. Resonance frequency measurements revealed the recovery of samples under different conditions. μ-CT, SEM-EDX, XRD and pH measurements were used to investigate the type and contents of healing products within the cracks. Different types of hydrated magnesium carbonates (HMCs) formed under each bacteria-urea solution due to differences in pH associated with bacteria-urea concentrations. While these phases first formed on top of the cracks, investigation of the crack depth revealed the presence of precipitates at inner sections, albeit at lower contents. The adopted MICP approach leading to the production of HMCs was an effective method for healing cracks in RMC-based samples, resulting in a high extent of healing in a short time period.

KW - Bacteria

KW - Crack (B)

KW - MgO (D)

KW - Microstructure (B)

KW - pH (A)

KW - Self-healing

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SN - 0008-8846

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ER -

The use of microbial induced carbonate precipitation in healing cracks within reactive magnesia cement-based blends

Abstract

Keywords

ASJC Scopus subject areas

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