Experimental study on the effect of concrete strength and corrosion level on bond between steel bar and concrete

  • Doan Dinh Thien Vuong

    HoChiMinh City University of Technology and Education, No. 1 Vo Van Ngan Street, Thu Duc, Ho Chi Minh City, Vietnam
  • Nguyen Thanh Hung

    HoChiMinh City University of Technology and Education, No. 1 Vo Van Ngan Street, Thu Duc, Ho Chi Minh City, Vietnam
  • Nguyen Dinh Hung

    International University, VNU HCMC, Quarter 6, Linh Trung Ward, Thu Duc, Ho Chi Minh City, Vietnam
Email: ndinhhung@hcmiu.edu.vn
Từ khóa: Bond-slip relationship, concrete strength, corrosion level, corroded RC structure, pull-out.

Tóm tắt

Corrosion of the steel reinforcement bars reduces the area of the steel bar and the bond stress between the steel bars and around concrete that decreases the capacity of concrete structures. In this study, the bond stress between steel bar with a diameter of 12mm and concrete was examined with the effect of different corrosion levels and different concrete grades. A steel bar was inserted in a concrete block with a size of 20×20×20cm. The compressive strength of concrete was 25.6MPa, 35.1MPa, and 44.1MPa. These specimens were soaked into solution NaCl 3.5% to accelerate the corrosion process with different corrosion levels in the length of 60mm. The pull-out test was conducted. Results showed that the bond strength of the corroded steel bar was higher than that predicted from CEB-FIP. Slip displacement and the range of slip displacement at the bond strength were reduced when the concrete compressive strength was increased. The rate of bond stress degradation occurred faster with the increment of the corrosion level when the concrete compressive strength was increased.

Tài liệu tham khảo

[1]. Tekeste Teshome Gebregziabhier, Durability problems of 20th century reinforced concrete heritage structures and their restorations, Barcelona, July 2008.
[2]. Training and retraining materials on corrosion test for concrete and reinforced concrete, Training program Project 1511, Vietnam Ministry of Construction, 2016.
[3]. C. D. Tien, P. V. Khoan, L. Q. Hung, Final report of Economic - Technical project for anti-corrosion and protection of reinforced concrete works in coastal areas, Vietnam Institute for Building Science and Technology (IBST), 11 (2003) 78-88.
[4]. N. N. Thang, Application study of calcium nitrite as an additive to inhibit reinforcement for reinforced concrete in Vietnam, Vietnam Institute for Building Science and Technology (IBST), 3 (2006) 44-47.
[5]. M. G. Richardson, Fundamentals of durable reinforced concrete, London: Engineering & Technology, 23 May 2002. https://doi.org/10.1201/9781482272109
[6]. X. Fu, D. Chung, Effect of corrosion on the bond between concrete and steel rebar, Cement and Concrete Research, 27 (1997) 1811–1815. https://doi.org/10.1016/S0008-8846(97)00172-5
[7]. A. A. Torres-Acosta, S. Navarro-Gutierrez, J. Teran-Guillen, Residual flexure capacity of corroded reinforced concrete beams, Engineering Structures, 29 (2007) 1145–1152. https://doi.org/10.1016/j.engstruct.2006.07.018
[8]. J. Rodriguez, L. M. Ortega, A. M. Garda, Assessment of Structural Elements with Corroded Reinforcement, In Proceedings of the International Conference Corrosion and Corrosion Protection of Steel in Concrete, Structural Integrity Research Institute, 1994, pp. 172–185. http://worldcat.org/isbn/1850757232
[9]. J. P. Ollivier, A. Vichot, La durabilite des betons : bases scientifiques pour la formulation de bétons durables dans leur environnement/ sous la direction de Jean-Pierre Ollivier et Angelique Vichot, Ecole française du beton, 2008. (In French)
[10]. CEB-FIP, Fib Model Code for Concrete Structures, 2010.
[11]. P. F. Bamonte, P. G. Gambarova, High-Bond Bars in NSC and HSC: Study on Size Effect and on the Local Bond Stress-Slip Law, Journal of Structure Engineering, 133 (2007) 225-234. https://doi.org/10.1061/(ASCE)0733-9445(2007)133:2(225)
[12]. ASTM International Standard, ASTM C136-01, Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates, American, 2001.
[13]. ASTM International Standard, ASTM C33-18, Standard Specification for Concrete Aggregates, 2018.
[14]. American Concrete Institute, ACI CODE-318-19: Building Code Requirements for Structural Concrete and Commentary, 2019.
[15]. ACI 440.3R-04, Guide test methods for fiber-reinforced polymers (FRPs) for reinforcing or strengthening concrete structures, ACI Committee 440, American Concrete Institute, Farmington Hills, Michigan, USA; 2004.

Tải xuống

Chưa có dữ liệu thống kê
Nhận bài
28/04/2021
Nhận bài sửa
25/05/2021
Chấp nhận đăng
26/05/2021
Xuất bản
27/05/2021
Chuyên mục
Công trình khoa học