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    透水型再生水稳材料工程压实特性与颗粒破碎特征

    Engineering Compaction and Particle Breakage Characteristics of Cement-Stabilized Permeable Recycled Aggregate Materials

    • 摘要: 为研究建筑固体废弃物(建筑固废)再生骨料水泥稳定碎石基层现场压实特性及骨料颗粒破碎问题,基于智能颗粒传感器,研究了含建筑固废再生骨料水泥稳定碎石混合料在工程压实机械下混合料颗粒运动加速度、颗粒转动和内部颗粒振动能量传递特征,并分析了工程现场压实与室内静力压实作用对再生水稳混合料颗粒破碎的影响.研究结果表明,工程机械静压下骨料颗粒加速度较低,在重型钢轮振动压实作用下颗粒加速度是机械静压的10~45倍;在工程机械静压下骨料颗粒主要沿竖直向和横向翻转,在重型钢轮振动压实作用下颗粒主要沿竖直方向翻转;在工程机械静压下骨料颗粒振动能量主要沿竖直向和纵向传递,在重型钢轮振动压实作用下主要沿着竖直方向和行车方向传递;现场压实作用下的再生水稳混合料颗粒破碎没有室内静力压实作用下严重,室内静力压实作用下骨料颗粒破碎率比现场压实高20%,并且现场压实作用下混合料子颗粒分布曲线呈间断型,室内静力压实作用下混合料子颗粒分布曲线呈连续型.

       

      Abstract: The engineering field compaction characteristics and particle breakage of the cement-stabilized aggregate base layer with recycled aggregates(RA) from construction and demolition waste (CDW) were studied.Based on SmartRock sensors,the acceleration,particle rotation and internal particle vibration energy transfer characteristics of cement-stabilized aggregate mixtures (CSRA) containing RA from CDW under engineering compaction machinery,and the particle breakage effects of field compaction and laboratory static compaction on the CSRA mixtures were analyzed.Test results show that the particles acceleration under the weak vibration of heavy steel-wheel vibratory roller is 10~45 times that of static compaction;the aggregate particles under static compaction mainly turn along the vertical direction and transverse sides,and the particles under the steel-wheel roller machine weak vibration mainly turn along the vertical directions.When the aggregate particles under static compaction,the vibration energy is along the vertical and longitudinal directions.When the aggregate particles under the heavy steel-wheel vibratory roller weak vibration,the vibration energy is transferred along the vertical and traveling directions.The particle breakage of CSRA mixtures under field compaction is not serious as compared to laboratory static compaction,and the breakage index of aggregate particles under laboratory static compaction is 20% higher than that under field compaction.The sub-particle distribution curve of CSRA mixture under field compaction is intermittent,and the sub-particle distribution curve of CSRA mixture under laboratory static compaction is continuous.

       

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