高应变率下多尺寸聚丙烯纤维混凝土动态压缩力学性能研究

doi:10.11896/j.issn.1005-023X.2018.02.026

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Abstract

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/m ³, and the growth rate is up to 121.11%.

Key words： polypropylene fiber reinforced concrete SHPB multi-size strain rate effect dynamic characteristics

Published: 25 January 2018 Online: 2018-01-25

CLC number:

TU37

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	Articles by authors
	Ninghui LIANG
	Peng YANG
	Xinrong LIU
	Yang ZHONG
	Zheqi GUO

Cite this article:

Ninghui LIANG,Peng YANG,Xinrong LIU, et al. A Study on Dynamic Compressive Mechanical Properties of Multi-size Polypropylene Fiber Concrete Under High Strain Rate[J]. Materials Reports, 2018, 32(2): 288-294.

URL:

https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.02.026 OR https://www.mater-rep.com/EN/Y2018/V32/I2/288

Physical and mechanical parameters of polypropylene fiber

Mix proportions of concrete

Specimen number and average static compressive strength

Apparatus of 74 mm diameter SHPB

Processed part of the specimen

Summary of SHPB tests on multi-scale polypropylene fiber concrete

Stress-strain curves of concrete and fiber reinforced concrete with different strain rates

Dynamic compressive strength of MPFC with different strain rate

Dynamic increase factor of MPFC with different strain rate

Dynamic peak strain of MPFC with different strain rate

Dynamic limit strain of MPFC with different strain rate

Dynamic peak toughness of MPFC with different strain rates

Dynamic limit toughness of MPFC with differentstrain rates

Typical damage form of plain concrete and fiber concrete

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