Cyclic compression test and stress-strain constitutive relationship of polypropylene fiber coral seawater concrete

CHEN Zongping; QIN Qinquan; LIANG Ying; ZHOU Ji

doi:10.13801/j.cnki.fhclxb.20231215.002

Volume 41 Issue 8

Aug. 2024

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CHEN Zongping, QIN Qinquan, LIANG Ying, et al. Cyclic compression test and stress-strain constitutive relationship of polypropylene fiber coral seawater concrete[J]. Acta Materiae Compositae Sinica, 2024, 41(8): 4259-4271. doi: 10.13801/j.cnki.fhclxb.20231215.002

Citation:

CHEN Zongping, QIN Qinquan, LIANG Ying, et al. Cyclic compression test and stress-strain constitutive relationship of polypropylene fiber coral seawater concrete[J]. Acta Materiae Compositae Sinica, 2024, 41(8): 4259-4271. doi: 10.13801/j.cnki.fhclxb.20231215.002

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Cyclic compression test and stress-strain constitutive relationship of polypropylene fiber coral seawater concrete

doi: 10.13801/j.cnki.fhclxb.20231215.002

CHEN Zongping^{1, 2},
QIN Qinquan¹,
LIANG Ying^{2
,
,},
ZHOU Ji¹

1.
School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
2.
School of Architecture and Civil Engineering, Nanning University, Nanning 530200, China

Funds: National Natural Science Foundation of China (51578163); Central Leading Local Science and Technology Development Fund Project (ZY21195010); Bagui Scholars Program ([2019]79); Guangxi Science and Technology Base and Talent Special Project (Guike AD210750031); Counterpart Aid Project for Discipline Construction from Guangxi University (2023N01)

Received Date: 2023-10-20
Accepted Date: 2023-12-06
Rev Recd Date: 2023-11-14

Available Online: 2023-12-16

Publish Date: 2024-08-01

Abstract

Abstract

The stress-strain characteristics and damage evolution of polypropylene fiber coral seawater concrete (PPF/CAC) under uniaxial cyclic compression were studied. A total of 20 samples with different fiber volume fractions were tested. The failure form of PPF/CAC was observed in the test, and the stress-strain curve, peak stress-strain, plastic strain and other important indexes were obtained. The results show that the strength of specimens under cyclic loading is reduces by 1.21%-3.67% compared with that under monochrome loading, and the degradation can be slowed down with the increase of fiber content. The peak stress and peak strain increases are the largest when the polypropylene fiber volume fraction is 0.15vol%, which are 10.45% and 6.45%, respectively. In addition, the increase of PPF volume fraction can significantly reduce the accumulation of plastic strain and increase the elastic stiffness ratio. According to the test results, four characteristic points of hysteresis curve are defined: Unloading point, common point, residual point and end point. And the relationship between residual strain, common point strain and end point strain and unloading strain is established. Finally, the stress-strain constitutive equation and damage constitutive model of PPF/CAC under cyclic load are proposed, and the simplified stress-strain constitutive equation based on the damage evolution law can effectively predict the stress-strain behavior of PPF/CAC under cyclic load.
- polypropylene fiber,
- coral sea concrete,
- cyclic compression,
- stress-strain,
- constitutive equation
Long Abstrsct
Innovation Points

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References(29)

References

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