Enhancement of high temperature performance of cement blocks via CO 2 curing

Meng, Yazi and Ling, Tung Chai and Mo, Kim Hung and Tian, Weihao (2019) Enhancement of high temperature performance of cement blocks via CO 2 curing. Science of the Total Environment, 671. pp. 827-837. ISSN 0048-9697, DOI https://doi.org/10.1016/j.scitotenv.2019.03.411.

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Official URL: https://doi.org/10.1016/j.scitotenv.2019.03.411


Carbonation for the curing of cement-based materials has been gaining increased attention in recent years, especially in light of emerging initiatives to reduce carbon dioxide (CO 2 ) emissions. Carbonation method or CO 2 curing is founded on the basis of the reaction between CO 2 and cement products to form thermally stable and denser carbonate, which not only improves the physical and mechanical properties of cement-based materials, but also has the ability to utilize and store CO 2 safely and permanently. This study aims to assess the effect of CO 2 curing technology on the high-temperatures performance of cement blocks. Upon molding, dry-mix cement blocks were cured under statically accelerated carbonation condition (20% CO 2 concentration with 70% relative humidity) for 28 days, followed by exposure to elevated temperatures of 300 °C to 800 °C in order to comprehensively study the principal phase changes and decompositions of cement hydrates. The results indicated that CO 2 curing improved the performance of cement blocks, such as enhancement in the residual compressive strength and reducing the sorptivity. At 600 °C, the scanning electron microscopy (SEM) revealed a denser microstructure while thermal analisis and X-ray diffraction (XRD) analysis also clearly demonstrated that higher amounts of calcium carbonate were present in the cement blocks after CO 2 curing, suggesting better high-temperature performance compared to natural cured cement blocks. In general, an improved high-temperature performance, specifically at 600 °C of the dry-mixed cement blocks was demonstrated by adopting the CO 2 curing technology. This confirms the potential of utilizing CO 2 curing technology in not only improving quality of cement blocks, new avenue for storing of CO2 in construction material can be realized at the same time. © 2019

Item Type: Article
Funders: Key Research Project of Hunan Provincial Science and Technology Program “one-belt-one-road” ( 2017WK2090 ), NSFC International (Regional) Cooperation and Exchange Program ( 51750110506 )
Uncontrolled Keywords: CO2 curing; Cement block; High-temperature properties; Residual strength; Microstructure
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Mr. Mohd Safri
Date Deposited: 17 Mar 2020 02:52
Last Modified: 17 Mar 2020 02:52
URI: http://eprints.um.edu.my/id/eprint/16691

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