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Experimental study reveals enhanced toughness in rubber- and PVA-reinforced recycled gravel, suggesting extended pavement service life in variable climates.
Cold recycling of cement-stabilised materials represents a significant strategy for mitigating the environmental impact associated with highway reconstruction and expansion activities. To improve the toughness of cold-recycled cement-stabilised gravel, the incorporation of waste rubber particles and polyvinyl alcohol (PVA) fibres was implemented. The NaOH solution and fly ash were utilised for the treatment of waste rubber particles and PVA fibres, respectively. The mechanical properties of waste rubber particles and PVA fibres-reinforced cold-recycled cement-stabilised gravel (RPCCG) were investigated. The effectiveness of RPCCG in practical applications was validated. The results show that mixing rubber particles treated with a 5% NaOH solution and fibres treated with fly ash at a mass ratio of 1:50 can improve bonding effect of cement-stabilised materials. When the rubber particle content is set at 1% and the PVA fibre content is 0.9 kg/m3, the RPCCG demonstrates exceptional mechanical properties and toughness. Compared with cold-recycled cement-stabilised gravel, the ultimate split tensile strain has increased by more than 7 times. The application of waste rubber particles and PVA fibres alleviates the temperature-induced stress in RPCCG. The research findings can effectively extend the service life of asphalt pavement in areas with large temperature variations.
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Alimu et al. (2026) studied this question.
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