再生粗骨料含量对再生混凝土力学性能的影响分析
发布时间：2019-07-05 14:28
【摘要】：为了研究再生粗骨料取代率对再生混凝土力学性能的影响,利用废弃混凝土为再生粗骨料来源,研究取代率从0%至100%变化,中间级差为10%的11种再生混凝土,制作了33个标准立方体、33个标准棱柱体和33个尺寸为150 mm×150 mm×550 mm的棱柱体再生混凝土试件,依标准试验方法进行力学性能测试。通过试验,获取了再生混凝土取代率与立方体抗压强度、轴心抗压强度、抗折强度、应变延性系数、耗能系数、割线刚度和损伤度等力学性能指标之间的关系。研究结果表明:随着再生粗骨料取代率的增加,再生混凝土立方体抗压强度和轴心抗压强度总体呈现增长的趋势;抗折强度呈现先增长后减小的趋势;弹性模量总体呈现减小的趋势;延性系数、耗能系数、割线刚度总体均呈现减小的趋势但减小幅度较小;再生混凝土的刚度退化和损伤累积过程与天然混凝土较为一致。综合考虑再生混凝土基本力学性能指标和经济性能指标,建议以30%~40%作为再生混凝土的最优取代率。
文内图片：
图片说明：抗折试验加载方式
[Abstract]:In order to study the effect of recycled coarse aggregate substitution rate on the mechanical properties of recycled concrete, 11 kinds of recycled concrete with replacement rate ranging from 0% to 100% and intermediate grade difference of 10% were studied. 33 standard cubes, 33 standard prism and 33 prism specimens with size of 150 mm 脳 150 mm 脳 550 mm were made. The mechanical properties of recycled concrete were tested according to the standard test method. The relationship between the substitution rate of recycled concrete and the mechanical properties of cube compressive strength, axial compressive strength, bending strength, strain ductility coefficient, energy dissipation coefficient, Secant stiffness and damage degree is obtained. The results show that with the increase of the replacement rate of recycled coarse aggregate, the compressive strength and axial compressive strength of recycled concrete cube increase, the bending strength increases at first and then decreases, the elastic modulus decreases as a whole, the plasticity coefficient, energy dissipation coefficient and Secant stiffness all show a decreasing trend, but the decreasing range is small. The process of stiffness degradation and damage accumulation of recycled concrete is consistent with that of natural concrete. Considering the basic mechanical properties and economic properties of recycled concrete, it is suggested that 30% 鈮，
本文编号：2510590
文内图片：
图片说明：抗折试验加载方式
[Abstract]:In order to study the effect of recycled coarse aggregate substitution rate on the mechanical properties of recycled concrete, 11 kinds of recycled concrete with replacement rate ranging from 0% to 100% and intermediate grade difference of 10% were studied. 33 standard cubes, 33 standard prism and 33 prism specimens with size of 150 mm 脳 150 mm 脳 550 mm were made. The mechanical properties of recycled concrete were tested according to the standard test method. The relationship between the substitution rate of recycled concrete and the mechanical properties of cube compressive strength, axial compressive strength, bending strength, strain ductility coefficient, energy dissipation coefficient, Secant stiffness and damage degree is obtained. The results show that with the increase of the replacement rate of recycled coarse aggregate, the compressive strength and axial compressive strength of recycled concrete cube increase, the bending strength increases at first and then decreases, the elastic modulus decreases as a whole, the plasticity coefficient, energy dissipation coefficient and Secant stiffness all show a decreasing trend, but the decreasing range is small. The process of stiffness degradation and damage accumulation of recycled concrete is consistent with that of natural concrete. Considering the basic mechanical properties and economic properties of recycled concrete, it is suggested that 30% 鈮，
本文编号：2510590
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