The article presents the modified configuration of the longitudinal shear test of composite bars based on ASTM D 4475. The aim of the experimental program is to verify the possibility of using a three-point bending test to evaluate the resin quality and resin/fibre interface. The study focuses on influence of distance between support on calculated interlaminar shear strength. The properties of the resin are influenced by the alkaline environment. Resistance of the resin and resin/fibre interface exposed to this environment was determined by the test. An influence of the alkaline environment on interlaminar shear strength of FRP members was observed on both types of tested FRP bars.
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