Bond properties of bimetallic steel bar in seawater sea-sand concrete at different ages

被引：54
作者：
Hua, Jianmin [1 ,2 ]
Yang, Zhengtao [1 ]
Xue, Xuanyi [1 ,2 ]
Huang, Lepeng [1 ,2 ]
Wang, Neng [3 ]
Chen, Zengshun [1 ]
机构：
[1] Chongqing Univ, Sch Civil Engn, Chongqing 400045, Peoples R China
[2] Chongqing Univ, Key Lab New Technol Construct Cities Mt Area, Minist Educ, Chongqing 400045, Peoples R China
[3] Chongqing Univ, Sch Management Sci & Real Estate, Chongqing 400045, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2022年 / 323卷
基金：
中国国家自然科学基金;
关键词：
Bimetallic steel bar; Seawater sea-sand concrete; Bond property; Time-varying bond -slip model; Failure mode; MECHANICAL-PROPERTIES; REINFORCING STEEL; BEHAVIOR; CONSTRUCTION; PERFORMANCE; FATIGUE;
D O I：
10.1016/j.conbuildmat.2022.126539
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The bimetallic steel bar (BSB) consisting of stainless steel (cladding) and carbon steel (substrate) exhibits outstanding mechanical properties and high corrosion resistance and has a wide application in reinforced concrete (RC) structures with seawater sea-sand concrete (SWSSC). A metallurgical bonding layer exists between the cladding and substrate. The bond properties between the BSB and SWSSC with different concrete ages and c/ d ratios were investigated experimentally. Polyoxymethylene (POM) fibre, which has exceptional alkali resistance and tensile properties, was selected to improve the bond properties. The effects of the concrete age, POM fibre, and c/d ratio on the failure mode of bond test specimens are discussed. The scanning electron microscope (SEM) method was selected to clarify the connection between the POM fibre and SWSSC. After the bond test, there was no crack or broken area in the stainless-steel cladding of the BSB. Based on the test results, the variation trends of the key parameters of bond properties between the BSB and SWSSC are discussed. A timevarying bond-slip model is suggested to quantify the bond properties between the BSB and SWSSC effectively. A comparison of the peak bond stress tau u variation trend between SWSSC and ordinary concrete specimens was conducted. The variation trend of tau u,t/tau u,28 of the test specimens without POM fibre was similar to that of ordinary concrete specimens. The test results indicated that the POM fibre had an adverse effect on the growth rate of bond properties between the BSB and SWSSC.
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页数：15
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