EXPERIMENTAL RESEARCH ON RECYCLED AGGREGATE CONCRETE TENSILE AND SHEAR STRENGTH
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摘要: 考虑混凝土两个强度等级(C20、C30)和再生骨料取代率,进行再生混凝土劈裂抗拉试验、非标准试件的抗折试验和等高变宽梁的抗剪试验,研究再生混凝土抗拉、抗剪性能和变形,获得了以下成果:1)再生混凝土的劈裂强度稍低于普通混凝土。2)再生混凝土抗折强度离散范围较大,与立方体抗压强度间没有显著的回归关系。3)再生混凝土的抗剪能力随取代率增加没有明显的变化,极限切应力与混凝土的强度回归相关性较差。4)抗剪试验梁的主拉应变曲线在大约70%最大值以下时呈直线,超过此值以后逐渐弯曲。试验实测的名义切应力、剪切弹性模量较低。Abstract: Taking account of concrete cube strength and coarse aggregate replacement rate,tensile strength and shear strength property of recycled aggregate concrete had researched.In this paper,the tensile samples were standard cube,bending strength test used non-standard samples,section of the shear test beams was uniform depth and varying width.The stress strength and the strain of the test samples were researched.The following results were obtained: 1) the split strength of recycled concrete was lower than the natural aggregate concrete;2) bending strength of recycled concrete had a large range discrete,a reasonable regression formula could not be found;3) the ultimate shear stress was not changed with the replacement variation,regression of the shear strength and the cube strength had a lower relationship coefficient;4) the shear stress-principal strain curve of sample beams was a line when the indicated value was less than about 70% maximum value,the measured nominal stress of shear and shear modulus of elasticity were lower than natural coarse concrete.
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Key words:
- recycled concrete /
- replacement rate /
- shear /
- tensile /
- test
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