Influence of ratio of water to cement on corrosion of steel bar in hydraulic concrete

To study the destruction of hydraulic concrete structure resulting from the corrosion of steel bar,the influence of ratio of water to cement (W/C) on corrosion of steel bar in concrete without cracks were carried out using electrochemical tests. The results showed that the corrosion of steel bar was delayed at low W/C. It also showed that at stable corrosion time,the W/C had a well function relationship with stable corrosion current density. Further studies showed that with low W/C,concrete microstructure was compacted effectively decreasing of oxygen,capillary water,and interlayer water on the interface of concrete and steel bar,which was beneficial for preventing from the corrosion of steel bar. Therefore,reducing the ratio of water to cement can effectively delay the corrosion of steel bar reinforced concrete without cracks.