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中文摘要：
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。
英文摘要：
In order to research mechanical properties and failure mechanism of recycled concrete with different recycled coarse aggregate replacement rate .Using waste concrete as recycled coarse aggregate , 33 standard cubes , 33 standard prisms and 33 prisms (150 mm ×150 mm ×550 mm) were made as recycled concrete specimens , whose replacement rate changed from 0% to 100%, level difference was 10%.Through the test , the relationships among replacement rate and the mechanical properties indexes of cube compressive strength , axial compressive strength , flexural strength , strain ductility coefficient , energy dissipative coefficient , secant stiffness and damage degree of the recycled concrete were obtained .The research results showed that with increasing replacement rate , cube compressive strength and axial compressive strength of recycled concrete presented increasing trend .Flexural strength presented decreasing first and then increasing trend .Elastic modulus also presented decreasing trend .Ductility, energy dissipation and stiffness presented decreasing trend;secant stiffness and damage degree of the recycled concrete had the same trend as natural concrete .Considering comprehensively the basic mechanics and economic performance index, it was suggested that 30%~40%should be taken the optimal replacement rate .
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