骨料类型对再生混凝土力学特性的影响研究

发布时间：2018-04-14 01:04

本文选题：再生混凝土 + 力学特性　；参考：《应用力学学报》2017年01期

【摘要】：为了研究骨料类型对再生混凝土力学性能的影响,以再生粗骨料种类和取代率为变化参数,设计了198个再生混凝土试块,分别进行了立方体抗压强度、棱柱体抗压强度、抗折强度、弹性模量、泊松比等力学性能试验,获取了试件受力破坏全过程的应力-应变曲线以及峰值应力、峰值应变、弹性模量、泊松比等特征参数。基于试验数据,从位移延性、能量耗散、损伤过程、本构关系等方面分析了骨料类型对其破坏机理和力学性能的影响。试验结果表明:再生卵石混凝土的延性系数与耗能系数均值都比再生碎石混凝土大5%,前者的力学性能指标略好,变形性能更优,损伤过程也更为缓慢,而骨料类型对再生混凝土的能量耗散能力无明显影响。最后提出了不同骨料类型再生混凝土应力-应变本构方程,研究结果可供再生混凝土的进一步科学研究和工程应用提供参考。
[Abstract]:In order to study the effect of aggregate type on the mechanical properties of recycled concrete, 198 recycled concrete specimens were designed with the variety parameters of recycled coarse aggregate type and replacement rate. The cube compressive strength and the prism compressive strength were carried out respectively.The mechanical properties such as flexural strength, elastic modulus and Poisson's ratio are tested. The stress-strain curves and characteristic parameters such as peak stress, peak strain, elastic modulus and Poisson's ratio are obtained.Based on the experimental data, the effects of aggregate types on the failure mechanism and mechanical properties were analyzed from the aspects of displacement ductility, energy dissipation, damage process and constitutive relationship.The test results show that the ductility coefficient and energy dissipation coefficient of recycled pebble concrete are larger than that of recycled gravel concrete by 5 times. The former has better mechanical properties, better deformation performance and slower damage process.However, the type of aggregate has no obvious effect on the energy dissipation ability of recycled concrete.Finally, the stress-strain constitutive equations of recycled concrete with different aggregate types are proposed. The results can be used as a reference for further scientific research and engineering application of recycled concrete.
【作者单位】：广西大学土木建筑工程学院;广西大学工程防灾与结构安全教育部重点实验室;华南理工大学亚热带建筑科学国家重点实验室;
【基金】：国家自然科学基金(51268004;51578163) 广西自然科学基金(2016GXNSFDA380032) 广西研究生教育创新计划项目(YCBZ2015009)
【分类号】：TU528

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