中南大学学报（自然科学版）2017，Vol.48Issue(10)：2783-2789,7.DOI:10.11817/j.issn.1672-7207.2017.10.031
多尺寸聚丙烯纤维混凝土抗弯韧性试验研究
Experimental study of flexural toughness for multi-scale polypropylene fiber reinforced concrete
摘要
Abstract
In order to study the flexural toughness for multi-scale polypropylene fiber reinforced concrete, thirty 400 mm×100 mm×100 mm polypropylene fiber reinforced concrete beams were investigated by using the four point bending test, and their stress-strain curves were obtained. Based on the ASTM-C1399-98 method and the optimal engineering fiber content, the effects of multi-scale polypropylene fiber and hybrid fiber on the flexural toughness of concrete were studied. The results show that under the condition of the same content, the addition of polypropylene fine fibers will greatly improve the flexural toughness of concrete before cracking. Both coarse polypropylene fiber and multi-scale polypropylene fiber will greatly improve the flexural toughness of concrete, and after cracking a stress-strain hardening phenomenon appears under low stress circumstance. Multi-scale polypropylene fiber reinforced concrete would improve the flexural toughness to the maximum. Compared with the common concrete, the residual strength of fine polypropylene fiber concrete increases by 1.53-2.53 times. The residual strength of coarse polypropylene fiber concrete increases to 5.58-8.88 times. The residual strength of hybrid polypropylene fiber concrete increases by 7.76~10.82 times.关键词
抗弯韧性/荷载-挠度曲线/多尺度聚丙烯纤维/剩余强度Key words
flexural toughness/stress-strain curve/multi-scale polypropylene fiber reinforced concrete/residual strength分类
建筑与水利引用本文复制引用
梁宁慧,钟杨,刘新荣..多尺寸聚丙烯纤维混凝土抗弯韧性试验研究[J].中南大学学报（自然科学版）,2017,48(10):2783-2789,7.基金项目
国家自然科学基金资助项目(41372356) （41372356）
中央高校基本科研业务费专项基金资助项目(106112015CDJXY200007) （106112015CDJXY200007）
重庆市研究生科研创新项目(CYS16005)(Project(41372356) supported by the National Natural Science Foundation of China （CYS16005）
Project (106112015CDJXY200007) supported by the Fundamental Research Funds for the Central Universities （106112015CDJXY200007）
Project(CYS16005) supported by Graduate Scientific Research and Innovation of Chongqing) （CYS16005）
