A FRP rebar composition includes 15-45 vol % of a polymer matrix and 55-85% of a fiber mixture in which the fiber mixture includes 50-70 vol % of a first plurality of fibers which include carbon fibers and 30-50 vol % of a second plurality of fibers which are selected from the group consisting of PET fibers, glass fiber, and combinations thereof. A method of forming a FRP rebar includes feeding a first plurality of fibers and a second plurality of fibers simultaneously into a resin impregnator, pulling the fiber mixture through a liquid polymeric resin in the resin impregnator to form a resin-soaked fiber mixture, and passing the resin-soaked fiber mixture through a heated stationary die.