Ceramics-Silikáty 62, (1) 59 - 66 (2018)

Chloride induced corrosion is an important reason for the deterioration of reinforced concrete structures. The chloride transport properties of steel fibre reinforced concrete (SFRC) coupled with and without bending load (stress level of 0.5) were investigated through bulk diffusion test. A prediction model for chloride ingress in SFRC under bending load was established based on the Fick's second law. The time-dependent chloride diffusion coefficient was discussed and calculated. Apparent chloride diffusion coefficient was used to predict the corrosion initiation of SFRC structures. The experimental results showed that SFRC had better chloride resistance than plain concrete, especially when specimens were under bending load. The chloride diffusion coefficient of SFRC under tension was 30∼38% lower than that of plain concrete. For unstressed concrete, the calculated corrosion initiation of SFRC was 6∼40% longer compared with plain concrete. For concrete under bending load, the corrosion initiation of SFRC was 2.2∼3.6 times of that for plain concrete, varying with fibres dosage and cover thickness.