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

Rotana Hay; Cornelius Otchere; Ghanim Kashwani; Kemal Celik

doi:10.1016/j.jclepro.2021.128838

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

Rotana Hay, Cornelius Otchere, Ghanim Kashwani, Kemal Celik

Research output: Contribution to journal › Article › peer-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 language	English (US)
Article number	128838
Journal	Journal of Cleaner Production
Volume	320
DOIs	https://doi.org/10.1016/j.jclepro.2021.128838
State	Published - Oct 20 2021

Keywords

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

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
General Environmental Science
Strategy and Management
Industrial and Manufacturing Engineering

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10.1016/j.jclepro.2021.128838

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title = "Recycling carbonated reactive magnesium cement (RMC) as a building material",

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.",

keywords = "CO sequestration, Carbonation, Reactive magnesium oxide cement (RMC), Recycling, Sustainability",

author = "Rotana Hay and Cornelius Otchere and Ghanim Kashwani and Kemal Celik",

note = "Funding Information: This work was supported by the NYUAD Center for Interacting Urban Networks (CITIES) , funded by Tamkeen under the NYUAD Research Institute Award CG001, and by the Swiss Re Institute under the Quantum Cities{\texttrademark} initiative. The support received from the Abu Dhabi Department of Education and Knowledge (ADEK) for the grant ADHPG−RA686 is acknowledged. The authors also thank Tamkeen for funding the NYUAD Water Research Center under the NYUAD Research Institute Award (project CG007). The authors gratefully acknowledge the support received from Dr. James Weston, Dr. Oraib Al-Ketan, and Dr. Liang Li of the Core Technology Platforms at NYUAD. Publisher Copyright: {\textcopyright} 2021",

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AU - Hay, Rotana

AU - Otchere, Cornelius

AU - Kashwani, Ghanim

AU - Celik, Kemal

N1 - Funding Information: This work was supported by the NYUAD Center for Interacting Urban Networks (CITIES) , funded by Tamkeen under the NYUAD Research Institute Award CG001, and by the Swiss Re Institute under the Quantum Cities™ initiative. The support received from the Abu Dhabi Department of Education and Knowledge (ADEK) for the grant ADHPG−RA686 is acknowledged. The authors also thank Tamkeen for funding the NYUAD Water Research Center under the NYUAD Research Institute Award (project CG007). The authors gratefully acknowledge the support received from Dr. James Weston, Dr. Oraib Al-Ketan, and Dr. Liang Li of the Core Technology Platforms at NYUAD. Publisher Copyright: © 2021

PY - 2021/10/20

Y1 - 2021/10/20

N2 - 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.

AB - 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.

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KW - Recycling

KW - Sustainability

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

Abstract

Keywords

ASJC Scopus subject areas

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