Improving Freeze-thaw Resistance and Fatigue Resistance of Recycled Aggregate Concrete
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2024-09-04
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Edition:Draft Final Report 12/31/2023 – 09/04/2024
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Abstract:The use of recycled aggregate concrete (RAC) in pavement infrastructure provides a sustainable solution to address construction waste. However, RAC typically suffers from poor freeze-thaw resistance and reduced fatigue life due to the undesirable properties of recycled aggregates. This study explores three modification treatments—silane surface modification, sodium silicate surface modification, and silane internal modification—to improve RAC's durability and fatigue performance under freeze-thaw conditions. The modified RAC was evaluated based on mass loss ratio, compressive strength, relative elastic modulus, water permeability, and flexural strength during freeze-thaw cycles. Using scanning electron microscopy (SEM) and backscattered electron imaging (BSE), the microstructure of the recycled aggregates and the ITZ between aggregates and the cement matrix were analyzed. Additionally, fatigue life was assessed after 0, 70, and 140 freeze-thaw cycles at stress levels of 0.6, 0.7, and 0.8, and a fatigue life model was developed. The results indicate that the proposed treatments significantly enhance the freeze-thaw durability and fatigue resilience of RAC. This study supports the broader use of recycled aggregates in sustainable pavement construction.
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