Using WAW-2000 a multifunction servo-controlled testing machine

uniaxial quasi-static compression experiments for the steel fiber reinforced concrete(SFRC) were conducted with three strain rates.The volume fraction(V_f)of SFRC ranged from 0% to 3%

and the matrix was C50 concrete.The whole stress-strain curves of matrix and SFRC were obtained

and the results showed that with the increase of V_f

the compressive strength increased slowly

while the toughness increase quickly.With the increase of the strain rate

the strength of SFRC increased

but the toughness decreased

and the more the Vf

the less decreasing of the toughness.The results also showed that the elastic modulus and Poisson's ratio of SFRC were not sensitive material parameters

and with the increase of V_f

the former raised slightly and the latter decreased a little

respectively.A well suited numerical expression of the compressive stress-strain curve applicable to SFRC was put forward.