The influence of two corrosive environments on a short term and the fiber dosage on the compressive mechanical properties of RC-65/35-BN steel fiber reinforced concrete, SFRC, is assessed in this study. The experimental program comprised the test of 54 cylindrical-type SFRC specimens having steel fibers characterized by a length/diameter ratio of 65 and fiber dosages of 30 and 60 kg/m3. Regarding the exposure environments, 18 cylinders were subjected to the action of a watery environment, 18 cylinders were subjected to an environment of 3.5 % NaCl solution (chloride ion) and 18 cylinders were kept in unaltered conditions, during 60 days. A reduction of 2 % in the compressive strength, a decrease of 6 % in the modulus of elasticity, and an increase of 13 % in the Poisson’s ratio of the SFRC was observed for this phase of corrosion initiation. These results demonstrated that, on a short time, the corrosive environments do not affect significantly the mechanical properties under compressive stresses of the SFRC used in this study.