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冻融循环作用下骨料级配对再生透水混凝土抗压强度与透水性能的影响

Effect of Aggregate Gradation on Compressive Strength and Permeability of Recycled Pervious Concrete under Freeze-thaw Cycles

  • 摘要: 再生透水混凝土的冻融循环劣化是道路基础设施面临的关键耐久性问题,探明冻融循环作用下再生透水混凝土的性能劣化机制对促进其资源化利用具有重要意义。本研究基于粒子干涉理论,分别设计了连续级配、间断级配和单粒级配三种典型的再生骨料级配方案,探究了冻融循环作用下骨料级配对再生透水混凝土抗压强度和透水性能的影响。研究表明,间断级配再生骨料配制的透水混凝土在提升混凝土抗压强度方面最具优势,但连续级配再生骨料配制的透水混凝土的抗冻融循环作用能力最稳定。冻融循环作用会引起再生透水混凝土透水系数的增加,且单粒级配和连续级配分别对25次和50次冻融循环作用下透水混凝土的透水性能影响最显著。同时,间断级配G1~G6再生透水混凝土的抗压性能和透水系数在25次和50次冻融循环作用下的相关性最佳。本研究探究了冻融循环作用下三种典型级配方案对再生透水混凝土抗压强度与透水性能的影响,为再生骨料在透水混凝土中的应用提供了有效的试验数据与理论结果。

     

    Abstract: Freeze-thaw cycle deterioration of recycled pervious concrete (RPC) is a key durability issue facing road infrastructure. Elucidating the performance deterioration mechanisms of RPC under freeze-thaw cycles is of significant importance for promoting its resource utilization. Based on the particle interference theory, this study designed three typical gradation schemes for recycled aggregates (RAs): continuous gradation, discontinuous gradation, and single gradation, to investigate the effects of aggregate gradation on the compressive strength and permeability of RPC under freeze-thaw cycles. The research demonstrates that RPC prepared with discontinuous-graded RAs shows the most significant advantage in enhancing compressive strength, while that with continuously-graded RAs exhibits the most stable resistance to freeze-thaw cycles. Freeze-thaw cycles increase the permeability coefficient of RPC, with single gradation and continuous gradation exerting the strongest influence on the permeability performance after 25 and 50 freeze-thaw cycles, respectively. At the same time, the correlation between compressive performance and permeability coefficient of G1-G6 reclaimed RPC with intermittent gradation is the best under 25 and 50 freeze-thaw cycles. This study systematically investigates the impacts of three typical gradation schemes on the compressive strength and permeability of RPC, providing valuable experimental data and theoretical insights for the application of RAs in pervious concrete.

     

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