EFFECT OF THE BAR DIAMETER ON THE LOAD RESPONSE OF GFRP-CONCRETE PULL-OUT TESTS

This study focuses on the effect of the bar diameter of glass fiber-reinforced polymer (GFRP) bars on their bond with concrete using pull-out tests. The investigation involves three nominal bar diameters: 6 mm, 12 mm, and 20 mm and several bonded lengths. Within this study, the pull-out test results for both the 6 mm and 20 mm bars are presented for the first time, whereas the findings for the 12 mm bars were previously reported in a paper by the authors, where the effect of the bonded length on the experimental response was assessed. The influence of the bonded length on the bond strength for different diameters is discussed. Different bonded lengths are considered for each bar diameter, and the load responses are discussed.