Autogenous healing of fiber-reinforced reactive magnesia-based tensile strain-hardening composites

Reactive magnesia-based cement (RMC) is an emerging group of alternative binder to Portland cement. Recently, the first fiber-reinforced RMC-based strain-hardening composites (SHC) have been developed by the authors. The current work investigated the feasibility of the PC-free RMC-based SHC formulat...

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Main Authors: Qiu, Jishen, Ruan, Shaoqin, Unluer, Cise, Yang, En-Hua
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2021
Subjects:
MgO
Online Access:https://hdl.handle.net/10356/150632
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1506322021-06-07T08:19:22Z Autogenous healing of fiber-reinforced reactive magnesia-based tensile strain-hardening composites Qiu, Jishen Ruan, Shaoqin Unluer, Cise Yang, En-Hua School of Civil and Environmental Engineering Engineering::Civil engineering Autogenous Healing MgO Reactive magnesia-based cement (RMC) is an emerging group of alternative binder to Portland cement. Recently, the first fiber-reinforced RMC-based strain-hardening composites (SHC) have been developed by the authors. The current work investigated the feasibility of the PC-free RMC-based SHC formulations to engage autogenous healing. Results showed that crack sealing and significant mechanical recovery can be realized through proper environmental conditioning. The presence of water is necessary to engage autogenous healing and elevated CO2 concentration leads to the formation of HMCs that can seal larger crack. However, ample supply of CO2 results in fast sealing of crack on the near surface region, which blocks the pathway for further carbonation and healing of interior region of cracks. Microstructure analysis reveals that the healing products are hydrated magnesium carbonates (HMCs) and different conditioning regimes lead to different types of HMCs as the healing products. Ministry of Education (MOE) The authors would like to acknowledge the Ministry of Education, Singapore for the financial support of this research by the MOE Academic Research Fund Tier 2 project No. MOE2017-T2-1-087 (S). 2021-06-07T08:19:21Z 2021-06-07T08:19:21Z 2019 Journal Article Qiu, J., Ruan, S., Unluer, C. & Yang, E. (2019). Autogenous healing of fiber-reinforced reactive magnesia-based tensile strain-hardening composites. Cement and Concrete Research, 115, 401-413. https://dx.doi.org/10.1016/j.cemconres.2018.09.016 0008-8846 https://hdl.handle.net/10356/150632 10.1016/j.cemconres.2018.09.016 2-s2.0-85054004765 115 401 413 en MOE2017-T2-1-087 (S) Cement and Concrete Research © 2018 Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
Autogenous Healing
MgO
spellingShingle Engineering::Civil engineering
Autogenous Healing
MgO
Qiu, Jishen
Ruan, Shaoqin
Unluer, Cise
Yang, En-Hua
Autogenous healing of fiber-reinforced reactive magnesia-based tensile strain-hardening composites
description Reactive magnesia-based cement (RMC) is an emerging group of alternative binder to Portland cement. Recently, the first fiber-reinforced RMC-based strain-hardening composites (SHC) have been developed by the authors. The current work investigated the feasibility of the PC-free RMC-based SHC formulations to engage autogenous healing. Results showed that crack sealing and significant mechanical recovery can be realized through proper environmental conditioning. The presence of water is necessary to engage autogenous healing and elevated CO2 concentration leads to the formation of HMCs that can seal larger crack. However, ample supply of CO2 results in fast sealing of crack on the near surface region, which blocks the pathway for further carbonation and healing of interior region of cracks. Microstructure analysis reveals that the healing products are hydrated magnesium carbonates (HMCs) and different conditioning regimes lead to different types of HMCs as the healing products.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Qiu, Jishen
Ruan, Shaoqin
Unluer, Cise
Yang, En-Hua
format Article
author Qiu, Jishen
Ruan, Shaoqin
Unluer, Cise
Yang, En-Hua
author_sort Qiu, Jishen
title Autogenous healing of fiber-reinforced reactive magnesia-based tensile strain-hardening composites
title_short Autogenous healing of fiber-reinforced reactive magnesia-based tensile strain-hardening composites
title_full Autogenous healing of fiber-reinforced reactive magnesia-based tensile strain-hardening composites
title_fullStr Autogenous healing of fiber-reinforced reactive magnesia-based tensile strain-hardening composites
title_full_unstemmed Autogenous healing of fiber-reinforced reactive magnesia-based tensile strain-hardening composites
title_sort autogenous healing of fiber-reinforced reactive magnesia-based tensile strain-hardening composites
publishDate 2021
url https://hdl.handle.net/10356/150632
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