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• W3039551434 startingPage "101638" @default.
• W3039551434 abstract "High-volume (>50%) fly ash (HVFA) is used to partially replace cement in concrete to reduce the greenhouse gas emission, which is beneficial to both cement industry and environment. However, one drawback of using high-volume fly ash cement (HVFAC) is the increase of the water absorption and the reduction of the durability of cement-based materials. In this study, the effect of nanosilica (NS) on the compressive strength and water absorption of HVFAC pastes were investigated. In addition, the phase composition, microstructure and pore structure of the pastes were analyzed through X-ray diffraction (XRD), scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP). Results showed that the addition of NS increased the compressive strength and reduced the water absorption of HVFAC pastes. NS could react with Portlandite to produce additional C–S–H gel, and simultaneously a higher content of fly ash was hydrated in the presence of NS. Therefore, the incorporation of NS refined the pores and reduced the pore volume of HVFAC pastes. The pores with diameter larger than 10 nm were more pronounced for the water absorption ability of HVFAC composites. This study provided a possible way to reduce the negative effect brought by the increased water absorption when using HVFA in cementitious materials." @default.
• W3039551434 created "2020-07-10" @default.
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• W3039551434 date "2021-01-01" @default.
• W3039551434 modified "2023-10-16" @default.
• W3039551434 title "Modification of water absorption and pore structure of high-volume fly ash cement pastes by incorporating nanosilica" @default.
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• W3039551434 doi "https://doi.org/10.1016/j.jobe.2020.101638" @default.
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