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A platform for research: civil engineering, architecture and urbanism
Early-Day Effects of Graphene on NA2CO3: Activated GGBS Concrete
Achieving net-zero construction is curial for construction sector to mitigate the effects of climate change. Using alkali-activated materials (AAM) to replace the carbon intensive ordinary Portland cement (OPC) in concrete has attracted many researchers’ attention in the past years. However, several problems are associated with AAM, such as lower early age mechanical strength. This paper aimed to investigate the early days effects of graphene on hydration mechanism of Na2CO3-activated granulated blast-furnace slag (GGBS) concrete. Graphene dosages ranging from 0.005% to 0.02% (of slag weight) were considered in this study. The compressive strength of GGBS concrete was measured at 3 days. Samples were cured under ambient room temperature around 20 ± 3 °C. Results indicated the incorporation of graphene could increase the compressive strength up to 33%. To understand the changes on the microstructure level, various microstructure technics were performed on 3-day curing samples to provide a comprehensive understanding of the microstructure elements. X-ray diffraction (XRD) was employed to identify the composition and crystallinity of different phases. Overall, the higher gain in early-day strength of concrete and the shortened setting times are mainly due to the nucleation effect of graphene which was revealed by the much denser and compact microstructure, as shown in the SEM images.
Early-Day Effects of Graphene on NA2CO3: Activated GGBS Concrete
Achieving net-zero construction is curial for construction sector to mitigate the effects of climate change. Using alkali-activated materials (AAM) to replace the carbon intensive ordinary Portland cement (OPC) in concrete has attracted many researchers’ attention in the past years. However, several problems are associated with AAM, such as lower early age mechanical strength. This paper aimed to investigate the early days effects of graphene on hydration mechanism of Na2CO3-activated granulated blast-furnace slag (GGBS) concrete. Graphene dosages ranging from 0.005% to 0.02% (of slag weight) were considered in this study. The compressive strength of GGBS concrete was measured at 3 days. Samples were cured under ambient room temperature around 20 ± 3 °C. Results indicated the incorporation of graphene could increase the compressive strength up to 33%. To understand the changes on the microstructure level, various microstructure technics were performed on 3-day curing samples to provide a comprehensive understanding of the microstructure elements. X-ray diffraction (XRD) was employed to identify the composition and crystallinity of different phases. Overall, the higher gain in early-day strength of concrete and the shortened setting times are mainly due to the nucleation effect of graphene which was revealed by the much denser and compact microstructure, as shown in the SEM images.
Early-Day Effects of Graphene on NA2CO3: Activated GGBS Concrete
Lecture Notes in Civil Engineering
Kioumarsi, Mahdi (editor) / Shafei, Behrouz (editor) / Zhao, Yongcong (author) / Su, Meini (author) / Wang, Yong (author)
The International Conference on Net-Zero Civil Infrastructures: Innovations in Materials, Structures, and Management Practices (NTZR) ; 2024 ; Oslo, Norway
The 1st International Conference on Net-Zero Built Environment ; Chapter: 12 ; 131-140
2025-01-09
10 pages
Article/Chapter (Book)
Electronic Resource
English
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