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将高强度等级的自密实新混凝土和低强度等级的废旧混凝土块体混合浇筑,制作了8个300 mm×300 mm×300 mm立方体试件和8个300 mm×300 mm×600 mm棱柱体试件,对其进行了单轴受压试验,研究了废旧混凝土块体取代率(0、20%、30%和40%)和试件形状(立方体和棱柱体)对自密实再生混合混凝土受压性能的影响。研究表明:自密实再生混合混凝土中废旧混凝土块体与新混凝土的界面并非是明显的薄弱部位;随着废旧混凝土块体取代率的增大,自密实再生混合混凝土的组合抗压强度和弹性模量都逐渐降低,废旧混凝土块体取代率对组合抗压强度的影响相比弹性模量更为显著;当荷载比小于0.8时,自密实再生混合混凝土泊松比随荷载比的增长速度与新混凝土相差不大;当荷载比位于0.8~0.9区间时,前者泊松比随荷载比的增长速度明显快于后者。并在试验结果的基础上,提出了自密实再生混合混凝土组合抗压强度、弹性模量和峰值应变的计算方法。
Eight high-strength self-compacting concrete and low-strength waste concrete blocks were mixed and cast to produce eight cube specimens of 300 mm × 300 mm × 300 mm and eight prism specimens of 300 mm × 300 mm × 600 mm The uniaxial compression tests were carried out on the self-compacting hybrid concrete with compression ratio of waste concrete (0, 20%, 30% and 40%) and specimen shape (cubes and prisms) The impact of performance. The results show that the interface between the waste concrete block and the new concrete in the self-compacting recycled concrete is not obviously weak. With the increase of the substitution rate of the waste concrete block, the compressive strength and elastic modulus of the self-compacting recycled concrete The amount of waste concrete block replacement rate of composite compressive strength compared with the elastic modulus is more significant; when the load ratio is less than 0.8, self-compacting recycled concrete Poisson’s ratio with the load-bearing growth rate and the new Concrete is not much difference; when the load ratio is located in the range of 0.8 to 0.9, the former Poisson’s ratio with the load ratio increased significantly faster than the latter. On the basis of the experimental results, the calculation method of compressive strength, elastic modulus and peak strain of self-compacting recycled concrete mixture is proposed.