Influence of Corrosion on the Bond-Slip Behaviour between Corroded Bars and Concrete

被引：8

作者：

Zhao, Chenxu ^{[1
]}

Ying, Zongquan ^{[2
,3
,4
]}

Du, Chengbin ^{[1
]}

Yang, Shuai ^{[2
,3
,4
]}

Liu, Hansheng ^{[1
]}

机构：

[1] Hohai Univ, Coll Mech & Mat, Nanjing 210098, Peoples R China

[2] CCCC Fourth Harbour Engn Inst Co Ltd, Guangzhou 510230, Peoples R China

[3] Hydraul Struct Durabil Technol Key Lab Transportat, Guangzhou 510230, Peoples R China

[4] Guangdong Prov Lab Southern Ocean Sci & Engn Zhuha, Zhuhai 519082, Peoples R China

来源：

MATERIALS | 2023年 / 16卷 / 23期

关键词：

reinforced concrete; longitudinal bar corrosion; stirrup corrosion; concrete strength; bond-slip; constitutive model; STRENGTH;

D O I：

10.3390/ma16237366

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Pull-out tests were conducted to investigate the effects of corrosion of both the longitudinal bars and stirrups on the bond slip behaviour of reinforced concrete specimens. The main experimental variables include concrete strength (26.7 MPa, 37.7 MPa and 45.2 MPa) and expected corrosion loss (0%, 4%, 8% and 12%), with a total of 63 specimens fabricated. The results show that the relative bonding strength of specimens under different concrete strengths gradually decreases with increasing corrosion loss, but the higher the concrete strength is, the faster its degradation rate. The influence of stirrup corrosion on the peak slip can be ignored, but it will further aggravate the degradation of the bonding strength of the specimens. This reduction in bonding strength is linearly related to the stirrup corrosion loss. Based on the experimental results of this work and the achievements of other scholars, a modified relative bonding strength degradation model and a bond-slipbond-slip constitutive model of corroded reinforced concrete are presented by accounting for the influence coefficient of concrete strength. The results show that the constitutive model is in good agreement with the relevant experimental results.

引用

页数：17

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