The four-point loading tests of polyvinyl alcohol fiber-reinforced recycled aggregate concrete (PVAF-RRAC) slabs are conducted and the impacts of reinforcement ratio ρs, content of PVA fiber ρf, span-thickness ratio l/h and replacement ratio of recycled coarse aggregate (RCA) γ on crack formation mechanism, crack spacing and crack width are analyzed. The failure modes of recycled aggregate concrete (RAC) slabs and PVAF-RRAC slabs are distinguished by yield of longitudinal tensile reinforcement and fragmentation of concrete in compression zone. Meanwhile, the damage of PVAF-RRAC slabs is also accompanied by pull-out or broken of PVA fibers along crack gaps. In contrast, the concrete crushing phenomenon of PVAF-RRAC slabs is not distinct, indicating PVA fibers incorporation could improve flexural performance. The average spacing and maximum crack width of PVAF-RRAC slabs are relatively small, the crack distribution is more uniform. The crack development rate and crack width decrease as ρf or ρs increases while they increase as γ or l/h increases. Considering the impact of ρf on average crack spacing, a formula for approximately forecasting the average crack spacing of PVAF-RRAC slabs is proposed. Additionally, an influence coefficient of RCA is introduced, a prediction model for crack width in PVAF-RRAC slabs is established and test data are validated with favorable results.


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    Title :

    A Model for Predicting Crack Width of PVA Fiber-Reinforced Recycled Aggregate Concrete Slabs


    Additional title:

    KSCE J Civ Eng


    Contributors:
    Yu, Feng (author) / Xie, Changfeng (author) / Fang, Yuan (author) / Song, Jie (author) / Xie, Honglei (author) / Zhang, Shijiang (author) / Song, Wenlong (author)

    Published in:

    Publication date :

    2024-12-01


    Size :

    18 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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