Mechanical Properties of CFRC Additionally Reinforced with CFRP Rods

Potential of using pitch-based high modulus carbon fiber was investigated as a reinforcement in cementitious composites for structural reinforced concrete (RC) members. For this purpose, effects of carbon fiber mechanical properties on the mechanical properties of CFRC reinforced with CFRP rods were studied through the three-point flexural test by using several pitch-based high modulus carbon fiber rods of varying fiber moduli and strengths. For the specimens with a fiber volume fraction larger than the critical volume fraction, the flexural strength is found to exceed the CFRC matrix strength and is linearly proportional to the sum of all rod strengths, and the flexural modulus after matrix cracking is found to also be linearly proportional to the sum of all rod stiffnesses.