Abstract
This study aims to explore the impact of fly ash (FA) as a partial replacement for cement on the durability of recycled sand (RS) ultra high performance concrete (UHPC). The effects of FA content on the mechanical properties, resistance to chloride salt freezing-thawing coupling, and resistance to sulfate dry-wet cycling coupling of F-RUHPC were investigated. The results showed that FA improved the mechanical properties of F-RUHPC, with a compressive strength of up to 120.8 MPa. It also resulted in higher tensile strength compared to the control group and demonstrated excellent resistance to chloride salt freezing-thawing and sulfate dry-wet cycling. Microscopic analysis revealed a low content of free chloride ions within F-RUHPC, all below 0.08%. Additionally, the permeability coefficient of F-RUHPC with 10% FA was found to be the lowest under chloride salt freezing-thawing conditions. Microstructural characterization demonstrated the dense structure of UHPC. The addition of 10% FA was found to be beneficial in improving the mechanical properties and durability of F-RUHPC, providing a theoretical reference for the development of environmentally friendly UHPC.
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