[1]赵仁银,王业宇,施翔,等.PP纤维增强生态混凝土的力学性能研究[J].江苏水利,2023,(06):11-17,21.
 ZHAO Renyin,WANG Yeyu,SHI Xiang,et al.Study of mechanical properties of PP fiber reinforced eco-concrete[J].JIANGSU WATER RESOURCES,2023,(06):11-17,21.
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PP纤维增强生态混凝土的力学性能研究()
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《江苏水利》[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2023年06期
页码:
11-17,21
栏目:
水利工程建设
出版日期:
2023-06-30

文章信息/Info

Title:
Study of mechanical properties of PP fiber reinforced eco-concrete
文章编号:
1007-7839(2023)06-0011-0007
作者:
赵仁银1王业宇2施翔2野博超1侯利军1
(1. 河海大学 海岸灾害及防护教育部重点实验室,江苏 南京 210098;2. 江苏省骆运水利工程管理处,江苏 宿迁 223800)
Author(s):
ZHAO Renyin1 WANG Yeyu2 SHI Xiang2 YE Bochao1 HOU Lijun1
(1. Key Laboratory of Coastal Disaster and Protection (Hohai University), Ministry of Education, Nanjing 210098, China;2. Luoyun Hydraulic Project Management Division of Jiangsu Province, Suqian 223800, China)
关键词:
生态混凝土纤维抗压劈拉抗弯韧性
Keywords:
eco-concrete fiber compression splitting tension anti-bending toughness
分类号:
TV213.4
文献标志码:
B
摘要:
掺加短切纤维是改善生态混凝土脆性行为的重要方法。以聚丙烯(PP)纤维作为增强纤维,通过抗压、劈拉和受弯试验研究了不同纤维掺量下生态混凝土的力学性能。试验结果表明,纤维桥接作用可有效抑制微裂缝扩展,改善受压破坏试件整体性,增大劈拉和受弯破坏截面的粗糙度。其次,掺加纤维略微降低生态混凝土孔隙率。此外,在力学性能方面,纤维掺量在0.3%以内时,抗压强度仅轻微降低,而掺量0.4%时抗压强度下降23%;劈拉和抗弯强度随着纤维掺量增大呈先增大后减小的变化规律,在掺量0.2%时性能较优。随着纤维掺量增大,受弯荷载-挠度曲线下降段残余荷载增大,弯曲韧性也相应提高。与纤维掺量相比,纤维长度对生态混凝土孔隙率和力学性能影响较小。
Abstract:
The addition of chopped fiber is an important method to improve the brittle behavior of eco-concrete. In this study, using polypropylene (PP) fiber as reinforcing fiber, the mechanical properties of eco-concrete with different fiber fractions are investigated through compression, splitting tension and bending tests. The experimental results show that the fiber bridging action can effectively inhibit the extension of microcracks, improve the integrity of specimens subjected to compression failure, and increase the roughness of cross sections under splitting tension and bending failure. Secondly, the addition of fiber slightly reduces the porosity of eco-concrete. In addition, in terms of mechanical properties, the compressive strength only decreases slightly at a fiber fraction lower than 0.3%, while at a fiber fraction of 0.4%, the compressive strength decreases by 23%. Moreover, the splitting tensile strength and flexural strength increase first and then decrease with an increase of fiber fraction, and the performance is better at the fraction of 0.2%. With an increase of fiber fraction, the residual flexural load in the descending section of the load-deflection curve increases gradually, and the flexural toughness is also enhanced correspondingly. Compared with the fraction of PP fiber, the length of PP fiber has slight influence on the porosity and mechanical properties of eco-concrete.

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备注/Memo

备注/Memo:
收稿日期:2023-03-18
基金项目:江苏省水利科技项目(2020016),南通市科技项目(JC2021168)
作者简介:赵仁银(1996—),男,硕士研究生,主要从事水工混凝土结构研究。E-mail:1035879784@qq.com
通信作者:侯利军(1981—),男,教授,博士生导师,主要从事水运工程结构研究。E-mail:hlj2932@hhu.edu.cn
更新日期/Last Update: 2023-06-30