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Title: Crack repairing of high strength engineered cementitious composites using bacteria-free waste medium
Authors: Feng, Jianhang
Chua, Song Xing
Yang, Fan
Qian, Shunzhi
Keywords: Engineering::Civil engineering
Issue Date: 2021
Source: Feng, J., Chua, S. X., Yang, F. & Qian, S. (2021). Crack repairing of high strength engineered cementitious composites using bacteria-free waste medium. Cement and Concrete Composites, 123, 104203-.
Project: RG71/20
Journal: Cement and Concrete Composites
Abstract: High strength engineered cementitious composites (ECC) that fracture under tensile stress present cracks with the width over 100 μm, which may not be easily repaired by autogenous healing. Herein, this study investigated the healing efficiency of high strength ECC after being immersed in bacteria-free medium which is waste medium during spore cultivation. During incubation of bacteria, concentration of carbonate ions in the medium could rise to 0.30 mol/L approximately. These carbonate ions can be leveraged in calcium carbonate precipitation process for crack healing, which contributed to greater reduction of crack width of ECC specimens in waste medium than that in water. The superior crack closure led to the recovery of water tightness by lowering down the water absorption of cracked specimens and the restoration of tensile properties including both tensile strength and ultimate strain even after final failure of specimens. Therefore, it can be concluded that bacteria-free waste medium is promising to promote healing of concrete cracks.
ISSN: 0958-9465
DOI: 10.1016/j.cemconcomp.2021.104203
Schools: School of Civil and Environmental Engineering 
Rights: © 2021 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles

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