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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

29卷

期数:

2012年02期

页码:

55-60

栏目:

出版日期:

2012-06-30

文章信息/Info

Title:

Experiment on Mechanical Properties of Ultra-high Performance Reinforced Concrete with Hybrid-fiber

作者:

孙小凯^1,2,刁波^1,2,叶英华^1,2,耿娇¹,玛丽娅¹

1. 北京航空航天大学 土木工程系,北京 100191; 2. 华南理工大学 亚热带建筑科学国家重点实验室,广东 广州 510640

Author(s):

SUN Xiao-kai^1,2, DIAO Bo^1,2, YE Ying-hua^1,2, GENG Jiao¹, MA Li-ya¹

1. Department of Civil Engineering, Beihang University, Beijing 100191, China; 2. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, Guangdong, China

关键词:

超高性能纤维混凝土;  力学性能;  纤维混杂;  弯曲韧性;  延性;  抗弯强度

Keywords:

ultra-high performance fiber reinforced concrete;  mechanical property;  hybrid-fiber;  bend ductility;  ductility;  flexural strength

分类号:

TU528.572

DOI:

-

文献标志码:

A

摘要:

采用工程上常用的2种不同长径比、不同强度的端弯型钢纤维和超细型钢纤维,通过立方体抗压试验和小梁抗弯试验,研究纤维体积率(体积分数)为2.0%时,端弯纤维和超细纤维混合比例对超高性能混凝土抗压强度、抗弯强度、延性的影响。结果表明:端弯纤维和超细纤维分别主导了超高性能混凝土强度和延性性能; 随着超细纤维体积率增加,超高性能混凝土抗压强度、抗弯强度和弯曲韧性提高; 随着端弯纤维体积率提高,小梁的延性增强; 2种纤维混合,可以均衡地改善基体混凝土的相应性能; 综合考虑各力学性能指标和经济性,端弯纤维与超细纤维体积率分别为0.5%和1.5%时为最佳配比。

Abstract:

When doped volume ratio of fiber(volume fraction)was 2.0%, through cubic compressive tests and beam flexural tests, hybrid-fibers between end-hooked and superfine tape steel fibers with different ratios of length to diameter and different parameters were used to study their effects on compressive strength, flexural strength, ductility of the ultra-high performance concrete(UHPC). The results show that the end-hooked and superfine fibers have their own dominative effects on mechanical properties of the bearing capacity and ductility behavior. With the increase doped volume ratios of superfine fibers, the mechanical properties of compressive strength, flexural strength and bend ductility of the UHPC increase. With the increase doped volume ratios of end-hooked fibers, the beam has a better performance on ductility. Hybrid-fibers between end-hooked and superfine fibers can enhance performance in all aspects of mechanical properties of concrete. Taking all factors of mechanical property index and economical efficiency into consideration, it is the best mixture proportion when doped volume ratios of end-hooked and superfine fibers are 0.5%, 1.5%.

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备注/Memo

备注/Memo:

收稿日期:2011-11-26
基金项目:国家自然科学基金项目(50978010); 亚热带建筑科学国家重点实验室开放基金项目(2010KB04)
作者简介:孙小凯(1987-),男,苗族,湖南湘西人,北京航空航天大学工学硕士研究生,E-mail:sunxiaokai37@163.com。

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更新日期/Last Update: 2012-06-20