Title:
Bond Strength of Black and Epoxy-Coated
Reinforcement-A Theoretical Approach
Author(s):
John Cairns and Ramli Bin Abdullah
Publication:
Materials Journal
Volume:
93
Issue:
4
Appears on pages(s):
362-369
Keywords:
bond (concrete to reinforcement); concretes; epoxy resins; lap
connections; reinforcing materials.
DOI:
10.14359/9823
Date:
7/1/1996
Abstract:
This paper analyzes the mechanics of bond strength of ribbed reinforcing bars in lapped joints under splitting modes offailure. Two failure types are identified, and analytical expressions to relate the bond strength developed by ribbed bars to the bursting forces generated by bond action are derived. Accuracy of the analysis is validated against test data. The resulting expressions are used to evaluate the bond strength reduction attributable to epoxy coating of reinforcement, and to examine the factors that influence the magnitude of that reduction. The analysis indicates that relative rib area and confining pressure both exert a significant influence on the reduction in bond strength of coated reinforcement, but that the reduction is not greatly influenced by rib face angle or by concrete strength.