A Study on Dynamic Compressive Mechanical Properties of Multi-size Polypropylene Fiber Concrete Under High Strain Rate

被引：0
|
作者：
Liang N. [1 ,2 ]
Yang P. [1 ,2 ]
Liu X. [1 ,2 ]
Zhong Y. [1 ,2 ]
Guo Z. [1 ,2 ]
机构：
[1] College of Civil Engineering, Chongqing University, Chongqing
[2] Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing
来源：
| 2018年 / Cailiao Daobaoshe/ Materials Review卷 / 32期
关键词：
Dynamic characteristics; Multi-size; Polypropylene fiber reinforced concrete; SHPB; Strain rate effect;
D O I：
10.11896/j.issn.1005-023X.2018.02.026
中图分类号：
学科分类号：
摘要：
Impacting compression tests of fine polypropylene fibers in two sizes and thick polypropylene fibers in one size, single-doped and mix-doped with concrete were conducted by 74 mm diameter split Hopkinson pressure bar (SHPB). Multi-size polypropylene fiber concrete specimens with coarse, fine fiber and different fiber content at 5 different strain rates under dynamic compressive strength, dynamic compressive deformation, dynamic compressive toughness and failure forms were compared and analyzed. The dynamic mechanical properties of polypropylene fiber were studied. The results showed that the dynamic compressive strength, dynamic compression deformation and dynamic compression toughness of concrete and fiber concrete show a significant strain rate effect with the increase of strain rate. In the range of strain rate, the dynamic compressive strength of coarse polypropylene fiber reinforced concrete is the highest, and in comparing with that of the plain concrete increased by 132.36%-213.85%. The dynamic compressive strength growth factor of multi-scale polypropylene fiber concrete is basically the same with that of plain concrete. The dynamic peak strain and ultimate strain of concrete under different strain rates can be increased effectively by adding polypropylene fiber. The dynamic ultimate toughness of multi-scale polypropylene fiber concrete is higher than that of polypropylene fiber concrete, and the dynamic ultimate toughness is the highest when the content of fine polypropylene fiber is 1.2 kg/m3, and the growth rate is up to 121.11%. © 2018, Materials Review Magazine. All right reserved.
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页码：288 / 294
页数：6
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