Effect of chloride ion on the compressive mechanical properties of RC-65/35-BN steel fiber reinforced concrete

Abstract

The influence of two corrosive environments on a short term and the fiberdosage on the compressive mechanical properties of RC-65/35-BN steelfiber reinforced concrete, SFRC, is assessed in this study. The experimentalprogram comprised the test of 54 cylindrical-type SFRC specimens havingsteel fibers characterized by a length/diameter ratio of 65 and fiber dosagesof 30 and 60 kg/m3. Regarding the exposure environments, 18 cylinderswere subjected to the action of a watery environment, 18 cylinders weresubjected to an environment of 3.5 % NaCl solution (chloride ion) and 18cylinders were kept in unaltered conditions, during 60 days. A reductionof 2 % in the compressive strength, a decrease of 6 % in the modulus ofelasticity, and an increase of 13 % in the Poisson’s ratio of the SFRC wasobserved for this phase of corrosion initiation. These results demonstratedthat, on a short time, the corrosive environments do not affect significantlythe mechanical properties under compressive stresses of the SFRC usedin this study.