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.

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