Valorization of waste concrete powder (WCP) through silica fume incorporation to enhance the reactivity and hydration characteristics
The aim of this study is to utilize the bulk proportion of waste concrete powder (WCP) as cementitious material in the fabrication of binder, and to investigate the impact of silica fume on the reactivity and hydration characteristics of thermomechanical activated WCP. A 29 Silicon Nuclear Magnetic...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-12-01
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| Series: | Developments in the Built Environment |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666165923001540 |
| _version_ | 1797387779924033536 |
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| author | Prabhat Vashistha Yanchen Oinam Sukhoon Pyo |
| author_facet | Prabhat Vashistha Yanchen Oinam Sukhoon Pyo |
| author_sort | Prabhat Vashistha |
| collection | DOAJ |
| description | The aim of this study is to utilize the bulk proportion of waste concrete powder (WCP) as cementitious material in the fabrication of binder, and to investigate the impact of silica fume on the reactivity and hydration characteristics of thermomechanical activated WCP. A 29 Silicon Nuclear Magnetic Resonance (NMR) analysis confirmed the presence of reactive silica in the activated WCP. Various blends were prepared with a 50%–80% substitution of type CEM I 52.5 N cement. The combination of activated WCP and silica fume improved the reactivity of the binder blend and achieved a compressive strength comparable to cement. Mineralogical analysis revealed the development of secondary C–S–H gels in mixtures containing silica fumes and activated WCP, which is the result of a secondary hydration reaction between portlandite and reactive silica. The use of life cycle analysis software for the replacement of 60 wt % of cement with activated WCP was found to reduce carbon dioxide emissions by 80.42% due to the use of less cement, an environmentally friendly WCP activation process, even when considering the addition of 10% silica fume. This innovative approach not only enhances WCP reactivity and mechanical strength but also significantly contributes to the reduction of carbon emissions. By elucidating the formation mechanisms and environmental benefits, this study paves the way for a more eco-conscious and efficient construction methodology, promoting the vision of a greener future. |
| first_indexed | 2024-03-08T22:31:04Z |
| format | Article |
| id | doaj.art-24424a1a49a4458d966b325c9fce63ba |
| institution | Directory Open Access Journal |
| issn | 2666-1659 |
| language | English |
| last_indexed | 2024-03-08T22:31:04Z |
| publishDate | 2023-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Developments in the Built Environment |
| spelling | doaj.art-24424a1a49a4458d966b325c9fce63ba2023-12-18T04:25:06ZengElsevierDevelopments in the Built Environment2666-16592023-12-0116100272Valorization of waste concrete powder (WCP) through silica fume incorporation to enhance the reactivity and hydration characteristicsPrabhat Vashistha0Yanchen Oinam1Sukhoon Pyo2Department of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulju-gun, Ulsan, 44919, Republic of KoreaDepartment of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulju-gun, Ulsan, 44919, Republic of KoreaCorresponding author.; Department of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulju-gun, Ulsan, 44919, Republic of KoreaThe aim of this study is to utilize the bulk proportion of waste concrete powder (WCP) as cementitious material in the fabrication of binder, and to investigate the impact of silica fume on the reactivity and hydration characteristics of thermomechanical activated WCP. A 29 Silicon Nuclear Magnetic Resonance (NMR) analysis confirmed the presence of reactive silica in the activated WCP. Various blends were prepared with a 50%–80% substitution of type CEM I 52.5 N cement. The combination of activated WCP and silica fume improved the reactivity of the binder blend and achieved a compressive strength comparable to cement. Mineralogical analysis revealed the development of secondary C–S–H gels in mixtures containing silica fumes and activated WCP, which is the result of a secondary hydration reaction between portlandite and reactive silica. The use of life cycle analysis software for the replacement of 60 wt % of cement with activated WCP was found to reduce carbon dioxide emissions by 80.42% due to the use of less cement, an environmentally friendly WCP activation process, even when considering the addition of 10% silica fume. This innovative approach not only enhances WCP reactivity and mechanical strength but also significantly contributes to the reduction of carbon emissions. By elucidating the formation mechanisms and environmental benefits, this study paves the way for a more eco-conscious and efficient construction methodology, promoting the vision of a greener future.http://www.sciencedirect.com/science/article/pii/S2666165923001540Waste concrete powderSilica fumeHeat of hydrationPozzolanic reactivitySustainable binder |
| spellingShingle | Prabhat Vashistha Yanchen Oinam Sukhoon Pyo Valorization of waste concrete powder (WCP) through silica fume incorporation to enhance the reactivity and hydration characteristics Developments in the Built Environment Waste concrete powder Silica fume Heat of hydration Pozzolanic reactivity Sustainable binder |
| title | Valorization of waste concrete powder (WCP) through silica fume incorporation to enhance the reactivity and hydration characteristics |
| title_full | Valorization of waste concrete powder (WCP) through silica fume incorporation to enhance the reactivity and hydration characteristics |
| title_fullStr | Valorization of waste concrete powder (WCP) through silica fume incorporation to enhance the reactivity and hydration characteristics |
| title_full_unstemmed | Valorization of waste concrete powder (WCP) through silica fume incorporation to enhance the reactivity and hydration characteristics |
| title_short | Valorization of waste concrete powder (WCP) through silica fume incorporation to enhance the reactivity and hydration characteristics |
| title_sort | valorization of waste concrete powder wcp through silica fume incorporation to enhance the reactivity and hydration characteristics |
| topic | Waste concrete powder Silica fume Heat of hydration Pozzolanic reactivity Sustainable binder |
| url | http://www.sciencedirect.com/science/article/pii/S2666165923001540 |
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