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

Tien-Dung Nguyen, Cise Unluer

Research output: Contribution to journalArticlepeer-review

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.
Original languageEnglish
Article number101834
Pages (from-to)1-17
Number of pages17
JournalJournal of CO2 Utilization
Volume56
Early online date3 Dec 2021
DOIs
Publication statusPublished - Feb 2022

Keywords

  • additives
  • CO sequestration
  • MgO
  • microstructure
  • performance

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