This paper examines the behavior of the Eurocrete FRP bars (Glass, Carbon, Aramid and Hybrid) in concrete under direct pullout conditions. More than 130 cube specimens were tested in direct pullout, where no splitting was allowed to develop. In normal concrete, the mode of bond failure of FRP bars was found to differ substantially from that of deformed steel bars, due to damage to the resin rich surface of the bar when pull-out takes place. The bond strengths developed by CFRP and GFRP bars appear to be very similar and just below what is expected from deformed steel bars under similar experimental conditions. The load slip curves highlight some of the fundamental differences between steel and FRP materials. This paper reports in detail on the influence of various parameters that affect bond strength and development, such as: the embedment length, type, shape, surface characteristics and diameter of the bar as well as the concrete strength. The testing arrangement is also shown to influence the bond strength, due to the "wedging effect" of the bars.

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