为研究掺入塑料颗粒对混凝土力学强度及断裂特性的影响，开展掺聚丙烯颗粒混凝土抗压、劈裂抗拉及三点弯曲试验，研究不同聚丙烯颗粒掺量对混凝土抗压强度、抗拉强度、弯曲性能、弹性模量及断裂能的影响。结果表明：与素混凝土相比，聚丙烯颗粒掺量为10%、20%和30%的试件抗压强度分别减小8.3%、17.7%和23.8%，劈裂抗拉强度减小10.7%、21.4%和31.9%，峰值荷载减小17.6%、32.5%和45.9%，抗弯强度减小18.0%、32.3%和46.0%，弹性模量减小22.4%、42.3%和53.9%；聚丙烯颗粒掺量为0、10%、20%和30%的试件断裂能增长速率分别为2.4、11.6、17.1、24.9 kN/m。

To investigate the effect of adding plastic particles on the fracture behavior of concrete, three-point bending tests were conducted on concrete with polypropylene particles. The effects of different amounts of polypropylene particles on the compressive strength, tensile strength, flexural properties, elastic modulus, and fracture energy of concrete were studied. The results showed that compared with plain concrete, the compressive strength of specimens with 10%, 20% and 30% of polypropylene particles decreased by 8.3%, 17.7% and 23.8%, the splitting tensile strength decreased by 10.7%, 21.4% and 31.9%, the peak load decreased by 17.6%, 32.5% and 45.9%, the flexural strength decreased by 18.0%, 32.3% and 46.0%, and the elastic modulus decreased by 22.4%, 42.3% and 53.9%, respectively. For specimens with 0, 10%, 20% and 30% of polypropylene particles, the fracture energy growth rates were 2.4, 11.6, 17.1, 24.9 kN/m, respectively.