再生粗骨料取代率及粒径对混凝土抗压性能影响试验研究

为研究单轴受压情况下再生粗骨料粒径范围、取代率对再生混凝土抗压性能的影响规律，分别以粒径范围5～10、10～20和20～31.5 mm,以及取代率分别为0%、10%、30%和50%为参量设计制作再生混凝土棱柱体试件，并对其开展单轴抗压性能试验研究。结果表明：在取代率相同时，粒径范围为5～10 mm时再生混凝土的抗压强度及峰值应变均比粒径范围为10～20、20～31.5 mm时的大；在粒径范围相同情况下，随取代率增大，再生混凝土抗压强度呈现出逐渐减小的变化趋势，而峰值应变则呈现出逐渐增大的变化趋势。根据试验数据，得出了再生混凝土抗压强度和峰值应变的函数关系式。

Experimental Study on the Effect of Replacement Rate and Particle Size of Recycled Coarse Aggregate on the Compressive Properties of Concrete

To study the influence of particle size range and substitution rate of recycled coarse aggregate on the compressive performance of recycled concrete under uniaxial compression, recycled concrete prism specimens were designed and manufactured with particle size ranges of 5~10, 10~20, and 20~31.5 mm, as well as substitution rates of 0%, 10%, 30%, and 50%, respectively. Uniaxial compre-ssive performance tests were conducted on them. The results show that the compressive strength and peak strain of recycled concrete in the particle size range of 5~10 mm are higher than those in the particle size range of 10~20 mm and 20~31.5 mm when the substitution rate is the same. Under the same particle size range, as the substitution rate increases, the compressive strength of recycled concrete shows a gradually decreasing trend, while the peak strain shows a gradually increasing trend. Based on the experimental data, a functional relationship between the compressive strength and peak strain of recycled concrete was obtained.