Advances in the carbonation of MgO-based binder and CO_2 utilization in the construction industry

Chikezie Chimere Onyekwena; Qiang Xue; Qi LiHappiness Ijeoma UmeobiAbdul GhaffarMohammad Hamed Fasihnikoutalab

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Advances in the carbonation of MgO-based binder and CO_2 utilization in the construction industry

机译：Advances in the carbonation of MgO-based binder and CO_2 utilization in the construction industry

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Magnesium oxide carbonation, especially the reactive magnesia (rMgO), is a new paradigm regarded as a green alternative to the traditional Portland cement. The eco-friendly nature of rMgO binder and the ability to consume industry-derived wastes during carbonation have caused it to receive significant attention in recent years as solutions are being sought for the difficulties facing the cement and construction industry. However, the reaction mechanisms and the carbonation conditions required to achieve an optimized carbonation degree and CO_2 uptake are still unclear and not fully understood. This article aimed to review previous studies that investigated the rMgO reaction mechanisms, some factors influencing the carbonation curing of rMgO-based composites, and the application of carbonated rMgO in soil stabilization. Findings revealed that rMgO hydration is a crucial aspect of the reaction process and suggests that factors such as material properties and curing conditions influence the carbonation process. The carbonation treatment utilizes sequestered CO_2 to enhance the mechanical and durability performance of carbonated rMgO composites by refining the pore structure and improving the porosity of the carbonated products. Meanwhile, utilizing hydration agents eliminates delayed hydration and improves the overall carbonation efficiency. Finally, recommendations for future research directions on the carbonation of rMgO-based composites were provided.

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《Clean technologies and environmental policy》 |2023年第6期|1763-1782|共20页
作者
Chikezie Chimere Onyekwena; Qiang Xue; Qi LiHappiness Ijeoma UmeobiAbdul GhaffarMohammad Hamed Fasihnikoutalab;
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作者单位

State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China, University of Chinese Academy of Sciences, Beijing 100049, China;

State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China, University of Chinese Academy of Sciences, Beijing 100049, China, Nnamdi Azikiwe University, Awka, N;

Department of Civil Engineering, University of Putra Malaysia, 43400 Serdang, Malaysia;

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正文语种英语
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Magnesium oxide; CO_2 sequestration; Carbonation efficiency; Carbonated rMgO composites; Soil stabilization;

Advances in the carbonation of MgO-based binder and CO_2 utilization in the construction industry

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