Synergistic effects of CO2 sequestration on mechanical, microstructural, and environmental performance in carbonated MgO-based ECC
Reactive magnesium oxide (MgO) cement (RMC) presents a promising approach to reducing CO2 emissions and mitigating environmental impacts in cement production. Owing to its capacity to form a durable, high-strength matrix, RMC is particularly suitable for producing Engineered Cementitious Composites...
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Elsevier
2025-01-01
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| Series: | Journal of CO2 Utilization |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2212982024003457 |
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| author | Zihao Song Rui Chen Tianyu Wang Haoliang Wu |
| author_facet | Zihao Song Rui Chen Tianyu Wang Haoliang Wu |
| author_sort | Zihao Song |
| collection | DOAJ |
| description | Reactive magnesium oxide (MgO) cement (RMC) presents a promising approach to reducing CO2 emissions and mitigating environmental impacts in cement production. Owing to its capacity to form a durable, high-strength matrix, RMC is particularly suitable for producing Engineered Cementitious Composites (ECC) with enhanced structural integrity. This study leveraged RMC’s high carbonation potential to assess its influence on the sustainability and mechanical performance of carbonated MgO-based ECC. Specifically, the effects of varying MgO content on mechanical properties, crack patterns, and microstructure were investigated across six mix designs, with MgO dosages ranging from 40 % to 70 % of the binder, under both standard and accelerated carbonation curing conditions. Results indicated that higher MgO dosages improved compressive and flexural strengths, with CM0.7 (70 % MgO) achieving a compressive strength increase from 30.02 MPa to 63.62 MPa over 28 days. Microstructural analyses via SEM-EDS and XRD revealed carbonation-induced densification, enhancing crack control and fiber-matrix bonding. The study concludes that increasing MgO content enhances both the sustainability and mechanical resilience of carbonated MgO-based ECC, though optimal dosing is necessary to balance strength gains with dimensional stability. These findings underscore the potential of carbonated MgO-based ECC as an environmentally favorable option for sustainable construction applications. |
| format | Article |
| id | doaj-art-38ce9a18e69545e59e390348fcd5129a |
| institution | Kabale University |
| issn | 2212-9839 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of CO2 Utilization |
| spelling | doaj-art-38ce9a18e69545e59e390348fcd5129a2025-01-13T04:18:52ZengElsevierJournal of CO2 Utilization2212-98392025-01-0191103010Synergistic effects of CO2 sequestration on mechanical, microstructural, and environmental performance in carbonated MgO-based ECCZihao Song0Rui Chen1Tianyu Wang2Haoliang Wu3State Key Laboratory for Tunnel Engineering, Sun Yat-sen University, Guangzhou 510275, China; School of Civil Engineering, Sun Yat-sen University & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, ChinaState Key Laboratory for Tunnel Engineering, Sun Yat-sen University, Guangzhou 510275, China; School of Civil Engineering, Sun Yat-sen University & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, ChinaDepartment of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SARState Key Laboratory for Tunnel Engineering, Sun Yat-sen University, Guangzhou 510275, China; School of Civil Engineering, Sun Yat-sen University & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China; Corresponding author at: State Key Laboratory for Tunnel Engineering, Sun Yat-sen University, Guangzhou 510275, China.Reactive magnesium oxide (MgO) cement (RMC) presents a promising approach to reducing CO2 emissions and mitigating environmental impacts in cement production. Owing to its capacity to form a durable, high-strength matrix, RMC is particularly suitable for producing Engineered Cementitious Composites (ECC) with enhanced structural integrity. This study leveraged RMC’s high carbonation potential to assess its influence on the sustainability and mechanical performance of carbonated MgO-based ECC. Specifically, the effects of varying MgO content on mechanical properties, crack patterns, and microstructure were investigated across six mix designs, with MgO dosages ranging from 40 % to 70 % of the binder, under both standard and accelerated carbonation curing conditions. Results indicated that higher MgO dosages improved compressive and flexural strengths, with CM0.7 (70 % MgO) achieving a compressive strength increase from 30.02 MPa to 63.62 MPa over 28 days. Microstructural analyses via SEM-EDS and XRD revealed carbonation-induced densification, enhancing crack control and fiber-matrix bonding. The study concludes that increasing MgO content enhances both the sustainability and mechanical resilience of carbonated MgO-based ECC, though optimal dosing is necessary to balance strength gains with dimensional stability. These findings underscore the potential of carbonated MgO-based ECC as an environmentally favorable option for sustainable construction applications.http://www.sciencedirect.com/science/article/pii/S2212982024003457Engineered cementitious compositeReactive magnesium oxide (MgO) cementCarbonated MgO-based ECCMechanical propertiesSustainability |
| spellingShingle | Zihao Song Rui Chen Tianyu Wang Haoliang Wu Synergistic effects of CO2 sequestration on mechanical, microstructural, and environmental performance in carbonated MgO-based ECC Journal of CO2 Utilization Engineered cementitious composite Reactive magnesium oxide (MgO) cement Carbonated MgO-based ECC Mechanical properties Sustainability |
| title | Synergistic effects of CO2 sequestration on mechanical, microstructural, and environmental performance in carbonated MgO-based ECC |
| title_full | Synergistic effects of CO2 sequestration on mechanical, microstructural, and environmental performance in carbonated MgO-based ECC |
| title_fullStr | Synergistic effects of CO2 sequestration on mechanical, microstructural, and environmental performance in carbonated MgO-based ECC |
| title_full_unstemmed | Synergistic effects of CO2 sequestration on mechanical, microstructural, and environmental performance in carbonated MgO-based ECC |
| title_short | Synergistic effects of CO2 sequestration on mechanical, microstructural, and environmental performance in carbonated MgO-based ECC |
| title_sort | synergistic effects of co2 sequestration on mechanical microstructural and environmental performance in carbonated mgo based ecc |
| topic | Engineered cementitious composite Reactive magnesium oxide (MgO) cement Carbonated MgO-based ECC Mechanical properties Sustainability |
| url | http://www.sciencedirect.com/science/article/pii/S2212982024003457 |
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