Potential of using pitch-based high modulus carbon fiber was investiga
ted as a reinforcement in cementitious composites for structural reinf
orced 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 fi
ber moduli and strengths. For the specimens with a fiber volume fracti
on 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.