Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/150631
Title: The use of microbial induced carbonate precipitation in healing cracks within reactive magnesia cement-based blends
Authors: Ruan, Shaoqin
Qiu, Jishen
Weng, Yiwei
Yang, Yang
Yang, En-Hua
Chu, Jian
Unluer, Cise
Keywords: Engineering::Civil engineering
Issue Date: 2019
Source: Ruan, S., Qiu, J., Weng, Y., Yang, Y., Yang, E., Chu, J. & Unluer, C. (2019). The use of microbial induced carbonate precipitation in healing cracks within reactive magnesia cement-based blends. Cement and Concrete Research, 115, 176-188. https://dx.doi.org/10.1016/j.cemconres.2018.10.018
Project: RG 95/16
MOE2015-T2-142
Journal: Cement and Concrete Research
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.
URI: https://hdl.handle.net/10356/150631
ISSN: 0008-8846
DOI: 10.1016/j.cemconres.2018.10.018
Rights: © 2018 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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