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Steel corrosion is one of the main factors of affecting the reinforced concrete structures durability.The chloride ion is one of the main causes of leading to the steel corrosion. that is importantly affect the concrete structures life. This paper had done a comprehensive study on the permeability of concrete, the main conclusions are as follows:1. Concrete is composed of aggregate, mortar and the interfacial transition zone, the permeability of aggregate is zero, from the experimental studies, the permeability of interfacial transition zone is far greater than the permeability of mortar.comparing with increased role of the interfacial transition zone on the permeability of concrete, the aggregate size has great effect on its permeability. Research on the permeability of concrete which is complex, we can not simply divided it into the mortar, aggregate and the interfacial transition zone three separate parts, the permeability of concrete is not a simple three-part superimposed.2. When concrete aggregate content increases from 40% to 100%, Permeability coefficient decreases at first, then increases, reduces at last. The conclusion same to rules aggregate concrete, Reflects the increase interface area with aggregate number of concrete, and the permeability of the concrete increasing. And the permeability of the concrete reduces with the aggregate increase. under the two together work, the results appear.3. When Concrete was little damaged, the permeability almost no different with none damage concrete, when damagevariable grows to a certain value, damage palys a significant impact on permeability, the permeability of concrete logarithmic increases as growing of damagevariable, and the permeability of concrete linear increases as growing of axial deformation.
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