河南城建学院学报2024，Vol.33Issue(4)：26-32,7.DOI:10.14140/j.cnki.hncjxb.2024.04.004
聚丙烯纤维混凝土基本力学性能及其尺寸效应研究
Basic mechanical properties and size effect of polypropylene fiber reinforced concrete
摘要
Abstract
To explore the size effect among strength indexes of polypropylene fiber reinforced concrete,the com-pressive strength,splitting tensile strength,bending flexural strength and fracture energy of concrete specimens with different sizes and different polypropylene fiber content were tested.The results showed that with the in-crease of polypropylene fiber content,the tensile strength,flexural strength and fracture energy of concrete specimens with all sizes increased significantly,but the compressive strength decreased.According to analysis of the load-displacement curve,failure mode,tension-compression ratio and folding-compression ratio of con-crete specimens,it was found that the maximum strain of compressive strength increased by 250%and the ten-sion-compression ratio increased from 1/11.2 to 1/7.3 after adding 1.5 kg/m3 polypropylene fiber,which showed that adding polypropylene fiber could improve the mechanical characteristics of concrete and make the material change from brittleness to toughness.The relationship among strength indexes and size effect were dis-cussed,and the conversion relationship among compressive strength,tensile strength and flexural strength was established,which provides a theoretical basis for structural design and analysis of polypropylene fiber rein-forced concrete.关键词
聚丙烯纤维/混凝土/强度指标/尺寸效应Key words
polypropylene fiber/concrete/strength index/size effect分类
建筑与水利引用本文复制引用
姚韦靖,江慧,庞建勇,肖宇辰..聚丙烯纤维混凝土基本力学性能及其尺寸效应研究[J].河南城建学院学报,2024,33(4):26-32,7.基金项目
淮南市科技计划项目(2023A313) （2023A313）
安徽省住房城乡建设科学技术计划项目(2023-YF048) （2023-YF048）
安徽省大学生创新创业训练计划项目(S202310361232) （S202310361232）
