Fiber reinforced recycled aggregate concrete has become a new type of green concrete material. The maximum particle size of coarse aggregates and steel fiber contents affect the mechanical properties and impact resistance of recycled aggregate concrete. However, such studies are rare in literature. The present paper shortens the gap through experimental study. A total of 144 specimens of 12 kinds of concrete mixtures were tested, which adopted different steel fiber volume admixtures (0%, 0.8%, 1.0%, 1.2%) and recycled coarse aggregates in different maximum particle sizes (9.5, 19, 31.5 mm) replacing 30% natural coarse aggregate. The compressive strength, splitting tensile strength, and impact resistance of the 12 concrete mixtures were tested. The results showed that the compressive strength, splitting tensile strength, and impact resistance of recycled aggregate concrete increased first and then decreased with the increase of the maximum particle size. The recycled aggregate concrete with the maximum particle size of 19 mm had the highest mechanical properties and impact resistance. Besides, with the increase of steel fiber content, the compressive strength, splitting tensile strength, and impact resistance of recycled aggregate concrete showed an increasing trend. Considering a large amount of experimental data and the coupling effect of steel fiber contents and the maximum particle size of coarse aggregates, the Weibull distribution function was introduced to analyze the impact test results and predict the number of resistance to impact under different failure probabilities. The results showed that the number of blows of the recycled aggregate concrete followed a two-parameter Weibull distribution, and the estimated value of the number of resistance to impact for failure increased with the increase of the failure probability.

纤维增强再生骨料混凝土已成为一种新型的绿色混凝土材料。粗骨料的最大粒径和钢纤维含量影响再生骨料混凝土的力学性能和抗冲击性能。然而，这样的研究在文献中很少见。本文通过实验研究缩短了这一差距。采用不同钢纤维掺合料（0%、0.8%、1.0%、1.2%）和不同最大粒径（9.5、19、31.5 mm）再生粗骨料，共试验12种混凝土混合料144个试件) 替代 30% 的天然粗骨料。测试了 12 种混凝土混合物的抗压强度、劈裂抗拉强度和抗冲击性。结果表明，抗压强度、劈裂抗拉强度、再生骨料混凝土的抗冲击性能随着最大粒径的增大先增大后减小。最大粒径为 19 mm 的再生骨料混凝土具有最高的力学性能和抗冲击性能。此外，随着钢纤维含量的增加，再生骨料混凝土的抗压强度、劈裂抗拉强度和抗冲击强度均呈增加趋势。考虑到大量的实验数据以及钢纤维含量与粗骨料最大粒径的耦合效应，引入威布尔分布函数对冲击试验结果进行分析，预测不同失效概率下的抗冲击次数。