Recycling carbonated reactive magnesium cement (RMC) as a building material

Rotana Hay, Cornelius Otchere, Ghanim Kashwani, Kemal Celik

Research output: Contribution to journalArticlepeer-review

Abstract

This study assessed the recyclability of reactive magnesium cement (RMC). To simulate the condition of construction waste recovery, a carbonated RMC-based paste was ground and used as a replacement for fresh RMC at 20 and 40 wt%. Both paste and mortar specimens were prepared and subjected to carbonation under 20% CO2, 80% RH, and 30 °C. Calorimetry data revealed that the main hydration peaks were delayed. The cumulative heat flow values were reduced, attributable to an increase in pore solution pH and physical barrier created by amorphous phases, which were confirmed by the appearance of broad peaks coinciding with those of hydromagnesite. Under carbonation, the peaks became more apparent due to the transformation of the phases into crystalline hydromagnesite. At 20 wt% replacement, the composite incorporated with the recycled RMC attained an improved strength performance due to more formation of the amorphous phases and hydrated magnesium carbonates (HMCs) from brucite.

Original languageEnglish (US)
Article number128838
JournalJournal of Cleaner Production
Volume320
DOIs
StatePublished - Oct 20 2021

Keywords

  • CO sequestration
  • Carbonation
  • Reactive magnesium oxide cement (RMC)
  • Recycling
  • Sustainability

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Science(all)
  • Strategy and Management
  • Industrial and Manufacturing Engineering

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