Potential additives for magnesia-based concrete with enhanced performance and propensity for CO2 sequestration

Dung, N.T. and Unluer, C. (2022) Potential additives for magnesia-based concrete with enhanced performance and propensity for CO2 sequestration. Journal of CO2 Utilization, 56, 101834. (doi: 10.1016/j.jcou.2021.101834)

Abstract

This study focuses on the development of carbonated reactive magnesia cement (RMC) concrete formulations involving hydromagnesite (H), magnesite (M) and hydration agent (HA). Partial replacement of RMC by H and M stimulated the formation of hydrate and carbonate phases. Use of H increased the rate and degree of hydration, resulting in the formation of a bird nest-like structure containing poorly-crystalline brucite. The higher propensity of this poorly-crystalline phase for carbonation increased the utilisation of RMC as a binder and facilitated its conversion into strength-providing HMCs. Synergistic combination of M and HA led to significant strength gain via increased carbonate content and reduced w/b ratio. Presence of M provided micro-aggregates that facilitated the enhanced formation of large carbonate crystals with improved morphologies, resulting in microstructure densification and 113 % strength increase. Furthermore, partial replacement of RMC with M enabled reduction of natural resources, CO2 emissions and energy consumption associated with RMC production.

• Item Type: Articles
• Additional Information: The authors would like to acknowledge the financial support from the Singapore MOE Academic Research Fund Tier 1 (RG 95/16) for the completion of this research project.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Unluer, Dr Cise

Creator Roles

Unluer, C.: Resources, Methodology, Writing – review and editing, Supervision, Project administration

• Authors: Dung, N.T., and Unluer, C.
• College/School: College of Science and Engineering > School of Engineering > Infrastructure and Environment
• Journal Name: Journal of CO2 Utilization
• Publisher: Elsevier
• ISSN: 2212-9820
• ISSN (Online): 2212-9839
• Published Online: 03 December 2021
• Copyright Holders: Copyright © 2021 Elsevier Ltd
• First Published: First published in Journal of CO2 Utilization 56:101834
• Publisher Policy: Reproduced in accordance with the publisher copyright policy