摘要
为探讨掺入塑料颗粒对混凝土弯曲特性及断裂损伤行为的影响,以改性回收聚丙烯(PP)塑料颗粒混凝土为研究对象,开展针对不同塑料颗粒掺量的混凝土切口梁三点弯曲疲劳断裂试验。结果表明,塑料颗粒混凝土荷载-裂缝口张开位移曲线呈“单峰型”,掺入PP塑料颗粒后,裂缝口张开位移保持不变,但曲线下降分支明显变缓,混凝土疲劳破坏延性增强;PP塑料颗粒适当掺入,可有效缓解混凝土的疲劳损伤;PP颗粒在受拉时起到一定的桥接作用,提高混凝土韧性和抗变形能力;随着PP塑料颗粒掺量的增大,混凝土断裂能和吸能能力呈线性增加,疲劳寿命明显延长。
To investigate the effect of plastic particles on the bending characteristics and fracture damage behavior of con-crete,three-point bending fatigue fracture tests were conducted on the modified recycled polypropylene(PP)plastic parti-cle concretes used for the concrete notched beams.The experimental results indicated that the load crack opening dis-placement curve of plastic particle concretes presented a single peak shape.With the addition of PP plastic particles,there is no change in the crack opening displacement.However,the downward section of the curve descended significant-ly,and the fatigue failure ductility of concrete was enhanced.The appropriate addition of PP plastic particles can effec-tively alleviate the fatigue damage of concrete;The shape of plastic particles has a significant impact on the fatigue perfor-mance of concrete.Short columnar PP particles play a bridging role in the tension,improving the toughness and deforma-tion resistance of concrete.There is an increase in the fracture energy and energy absorption capacity of concrete after ad-dition of PP plastic particles.This results in a significant extension in the fatigue life.
作者
李静
肖东
何雨
代在波
LI Jing;XIAO Dong;HE Yu;DAI Zaibo(Huanghe University of Science and Technology,Zhengzhou 450006,China;Sichuan Railway Intelligent Operation and Maintenance Engineering Research Center,Chengdu 610218,China;Sichuan Highway Planning,Survey,Design and Research Institute Ltd,Chengdu 610041,China)
出处
《中国塑料》
北大核心
2025年第4期92-96,共5页
China Plastics
基金
国家重点实验室开放课题(FH2018sk201)。
关键词
聚丙烯塑料颗粒
混凝土
切口梁
损伤裂缝
弯曲断裂特性
polypropylene plastic particles
concrete
cutting beam bending
damage crack
bending fracture characteristics
