Influence of electrochemical chloride extraction on the bond between steel and concrete

摘要

Laboratory tests were undertaken to assess the effect of electrochemical chloride extraction (ECE) on the bond strength of plain reinforcing steel in concrete. Specimens were cured/stored for 3 months prior to ECE and were then treated at a current density of between 0.02 and 0.75 A/m~2 of reinforcement area for periods of up to 32 weeks. Chloride-free specimens showed a small gradual increase in bond strength after ECE. Prior to ECE, specimens containing chloride (1.5/100 by weight of cement ) had higher bond strength than chloride-free specimens, due to corrosion.