TY - JOUR
T1 - Accelerated carbonation of reactive magnesium oxide cement (RMC)-based composite with supercritical carbon dioxide (scCO2)
AU - Celik, Kemal
N1 - Funding Information:
The authors wish to express their gratitude and sincere appreciation to New York University Abu Dhabi for grant number ADHPG-ST254 to make this research possible and to Core Technology Platforms (CTPs) experts, specifically Dr. James Weston and Dr. Liang Li for guidance and assistance with some of the experiment. The help by undergraduate student Joel Ntwali Rukazambuga is also much appreciated.
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2020/3/1
Y1 - 2020/3/1
N2 - Reactive magnesium oxide cement (RMC) has the potential to become a sustainable alternative to ordinary Portland cement (OPC). In this study, an approach utilizing supercritical CO
2 (scCO
2) was investigated to accelerate carbonation of an RMC-based composite and to overcome its long carbonation process under the natural environment. It was found that scCO
2 led to an extremely rapid strength gain of the composite, with a mature strength level achievable within a period of hours. CO
2 sequestration factors were also increased by three folds as compared to samples cured under a 20% CO
2 concentration environment for 28 days. It was also revealed that the carbonation phases under scCO
2 were dominated by nesquehonite followed by hydromagnesite and some other intermediate hydrated magnesium carbonates (HMCs). More uniform carbonation within the matrix was also attained under the scCO
2 condition. Despite the promising outcomes, technical and cost challenges would need to be resolved before a possible scale-up.
AB - Reactive magnesium oxide cement (RMC) has the potential to become a sustainable alternative to ordinary Portland cement (OPC). In this study, an approach utilizing supercritical CO
2 (scCO
2) was investigated to accelerate carbonation of an RMC-based composite and to overcome its long carbonation process under the natural environment. It was found that scCO
2 led to an extremely rapid strength gain of the composite, with a mature strength level achievable within a period of hours. CO
2 sequestration factors were also increased by three folds as compared to samples cured under a 20% CO
2 concentration environment for 28 days. It was also revealed that the carbonation phases under scCO
2 were dominated by nesquehonite followed by hydromagnesite and some other intermediate hydrated magnesium carbonates (HMCs). More uniform carbonation within the matrix was also attained under the scCO
2 condition. Despite the promising outcomes, technical and cost challenges would need to be resolved before a possible scale-up.
UR - http://dx.doi.org/10.1016/j.jclepro.2019.119282
U2 - 10.1016/j.jclepro.2019.119282
DO - 10.1016/j.jclepro.2019.119282
M3 - Article
SN - 0959-6526
VL - 248
JO - Journal of Cleaner Production
JF - Journal of Cleaner Production
M1 - 119282
ER -