透水型建筑固废再生水稳材料抗压性能及疲劳性能试验研究

    Experimental Study on Compressive Strength and Fatigue Behavior of Cement-stabilized Permeable Recycled Aggregate Materials

    • 摘要: 老旧建筑拆除固体废弃物再生骨料可作为生态化建材用于透水型再生水稳基层, 但其力学性能和耐久性仍亟待深入研究。该文采用建筑固废再生骨料替代天然碎石, 将再生骨料、高炉矿渣、粉煤灰和硅灰等组分掺量作为设计变量, 基于正交试验理论共设计了9种不同胶凝材料配比类型的透水型再生水稳材料, 测试并分析了其室内无侧限抗压强度、渗透系数、弯拉应力以及疲劳寿命等力学性能的变化规律, 并构建了相应的预测模型。研究结果表明: 透水型再生水稳材料7天无侧限抗压强度满足我国高等级公路使用要求, 渗透系数也满足我国透水道路使用要求; 其疲劳寿命值离散性较大, 可用威布尔双参数分布模型较为准确地拟合, 基于此分布模型建立了其疲劳寿命预估方程, 可较好地预测试样不同存活概率下的疲劳寿命。

       

      Abstract: Recycled aggregates derived from construction demolition wastes (CDW) can be used as ecological alternatives in cement-stabilized permeable recycled aggregate base courses. However, their mechanical performance and long-term durability still need to be studied. In this study, the CDW derived recycled aggregates were used to replace natural ones, and the contents of four constituents (i.e., recycled aggregate, blast furnace slag, fly ash, and silica fume) were chosen as design variables. A total of 9 different cement-stabilized permeable recycled aggregate materials (CPRAM) were designed based on orthogonal design theory. They were tested in the laboratory with the results of unconfined compressive strength, coefficient of permeability, fracture strength, and fatigue life analyzed comparatively. The experimental results show that the 7-day unconfined compressive strength and the coefficient of permeability of CPRAM meet the requirements of high-grade roads and permeable roads in China, respectively. The laboratory-measured fatigue life values highly scattered, but can be fitted more acurately by the two-parameter Weibull distribution function. The fatigue life prediction equations were proposed accordingly, which were found capable of predicting the fatigue life of CPRAM under different survival probability levels.

       

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