Enhancing CO2-Cured cementitious binder with Mg-doped γ-C2S from high-Mg limestone

Songhui Liu; Pengjie Rong; Saisai Zhang; Hui Guo; Xuemao Guan; Jianping Zhu; Tangwei Mi

doi:10.1016/j.dibe.2023.100312

Enhancing CO₂-Cured cementitious binder with Mg-doped γ-C₂S from high-Mg limestone

Songhui Liu
, Pengjie Rong
, Saisai Zhang
, Hui Guo
, Xuemao Guan
, Jianping Zhu
, Tangwei Mi (Lead / Corresponding author)

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

289 Downloads (Pure)

Abstract

This study explores the use of Mg-doped γ-C₂S, an alternative to conventional Portland cement, to address the environmental impact of the cement industry. γ-C₂S, known for low hydration activity, shows promise as a CO₂-cured binder. The research investigates Mg substitution in γ-C₂S synthesis, utilizing high-Mg limestone resources. Varying Mg/Ca ratios in γ-C₂S synthesis promoted bredigite and merwinite phases during calcination, enhancing specific surface area by over 40%. Optimal Mg doping significantly increased carbonation reactivity, resulting in a 20% strength boost (115 MPa) after 24h of CO₂ curing. This improvement is attributed to enhanced crystallinity in carbonation products, namely hydromagnesite, nesquehonite, aragonite, and magnesite, leading to microstructure densification. The findings highlight Mg-doping as a promising strategy to enhance the carbonation performance of γ-C₂S from high-Mg limestone, offering prospects for sustainable construction materials with reduced CO₂ emissions.

Original language	English
Article number	100312
Number of pages	12
Journal	Developments in the Built Environment
Volume	17
Early online date	27 Dec 2023
DOIs	https://doi.org/10.1016/j.dibe.2023.100312
Publication status	Published - Mar 2024

Keywords

Bredigite
Carbonation
Merwinite
Mg-doped
γ-CS

ASJC Scopus subject areas

Architecture
Civil and Structural Engineering
Building and Construction
Materials Science (miscellaneous)
Computer Science Applications
Computer Graphics and Computer-Aided Design

Access to Document

10.1016/j.dibe.2023.100312Licence: CC BY-NC-ND

Final Published VersionFinal published version, 5.44 MBLicence: CC BY-NC-ND

Cite this

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title = "Enhancing CO2-Cured cementitious binder with Mg-doped γ-C2S from high-Mg limestone",

abstract = "This study explores the use of Mg-doped γ-C2S, an alternative to conventional Portland cement, to address the environmental impact of the cement industry. γ-C2S, known for low hydration activity, shows promise as a CO2-cured binder. The research investigates Mg substitution in γ-C2S synthesis, utilizing high-Mg limestone resources. Varying Mg/Ca ratios in γ-C2S synthesis promoted bredigite and merwinite phases during calcination, enhancing specific surface area by over 40\%. Optimal Mg doping significantly increased carbonation reactivity, resulting in a 20\% strength boost (115 MPa) after 24h of CO2 curing. This improvement is attributed to enhanced crystallinity in carbonation products, namely hydromagnesite, nesquehonite, aragonite, and magnesite, leading to microstructure densification. The findings highlight Mg-doping as a promising strategy to enhance the carbonation performance of γ-C2S from high-Mg limestone, offering prospects for sustainable construction materials with reduced CO2 emissions.",

keywords = "Bredigite, Carbonation, Merwinite, Mg-doped, γ-CS",

author = "Songhui Liu and Pengjie Rong and Saisai Zhang and Hui Guo and Xuemao Guan and Jianping Zhu and Tangwei Mi",

note = "Copyright: {\textcopyright} 2023 The Authors.",

year = "2024",

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doi = "10.1016/j.dibe.2023.100312",

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T1 - Enhancing CO2-Cured cementitious binder with Mg-doped γ-C2S from high-Mg limestone

AU - Liu, Songhui

AU - Rong, Pengjie

AU - Zhang, Saisai

AU - Guo, Hui

AU - Guan, Xuemao

AU - Zhu, Jianping

AU - Mi, Tangwei

PY - 2024/3

Y1 - 2024/3

N2 - This study explores the use of Mg-doped γ-C2S, an alternative to conventional Portland cement, to address the environmental impact of the cement industry. γ-C2S, known for low hydration activity, shows promise as a CO2-cured binder. The research investigates Mg substitution in γ-C2S synthesis, utilizing high-Mg limestone resources. Varying Mg/Ca ratios in γ-C2S synthesis promoted bredigite and merwinite phases during calcination, enhancing specific surface area by over 40%. Optimal Mg doping significantly increased carbonation reactivity, resulting in a 20% strength boost (115 MPa) after 24h of CO2 curing. This improvement is attributed to enhanced crystallinity in carbonation products, namely hydromagnesite, nesquehonite, aragonite, and magnesite, leading to microstructure densification. The findings highlight Mg-doping as a promising strategy to enhance the carbonation performance of γ-C2S from high-Mg limestone, offering prospects for sustainable construction materials with reduced CO2 emissions.

AB - This study explores the use of Mg-doped γ-C2S, an alternative to conventional Portland cement, to address the environmental impact of the cement industry. γ-C2S, known for low hydration activity, shows promise as a CO2-cured binder. The research investigates Mg substitution in γ-C2S synthesis, utilizing high-Mg limestone resources. Varying Mg/Ca ratios in γ-C2S synthesis promoted bredigite and merwinite phases during calcination, enhancing specific surface area by over 40%. Optimal Mg doping significantly increased carbonation reactivity, resulting in a 20% strength boost (115 MPa) after 24h of CO2 curing. This improvement is attributed to enhanced crystallinity in carbonation products, namely hydromagnesite, nesquehonite, aragonite, and magnesite, leading to microstructure densification. The findings highlight Mg-doping as a promising strategy to enhance the carbonation performance of γ-C2S from high-Mg limestone, offering prospects for sustainable construction materials with reduced CO2 emissions.

KW - Bredigite

KW - Carbonation

KW - Merwinite

KW - Mg-doped

KW - γ-CS

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