Date of Award

May 2021

Document Type


Degree Name

Master of Science (MS)


Civil Engineering

Committee Member

Amir Poursaee

Committee Member

M. Z. Naser


To enhance the corrosion resistance of steel, coated reinforcing bars are used in concrete. This coating can also affect the bond performance and crack size in steel reinforced concrete. This thesis presents the results of an experimental program wherein the flexural cracks of concrete beams reinforced with steel bars with different coatings are compared. Specimens with uncoated carbon “black” bars, epoxy-coated bars, galvanized bars, and textured epoxy-coated bars were used in this study. Beam specimens with one of these four types of reinforcements were subjected to a sustained load in 4-point bending for up to one week. During this time, cracks and displacement were monitored and documented. Then, the beams were loaded to failure to compare their load-displacement responses. The length and width of cracks as well as the number and spacing of cracks were recorded and compared. Consistent with other researchers, the results indicate that epoxy-coated bars have relatively poor bond with concrete and consequently poor crack control. In comparison, the black bars and bars with galvanizing and textured-epoxy coating resulted in better bond and crack control.



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