Divided into the process:
• The chloride ion permeability destroying reinforced passive screen.
Depending on the environmental conditions of specific work structure: wetlands, waters ebb, the right atmosphere marine and coastal areas
to prevent chloride ion ability of protective layer of reinforced concrete: may evaluate this possibility through the water tightness and thickness of reinforced concrete protection.
• diffusion process oxygen, moisture in the air temperatures high.
Structural dry as moisture under alternating cycles, the more likely a strong corrosive. By contrast, in a dry location, the ability of steel corrosion occurs slowly.
• The SO42- ion permeability
carbonate • chemical process reduces the pH of concrete over time
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