The corrosion of steel bar caused by the chloride ion eroding into the concrete is the main reason of durability descent and fracture of the concrete structure, and in the same way, the resistance of chloride ion penetration of recycled aggregate concrete is directly related to the safety and durability of the recycled aggregate concrete structure. Aiming at those, the contrast test of chloride ion penetrability of the recycled aggregate concrete and the natural aggregate concrete which were added with fly ash, granulated blast-furnace slag and high-rang water reducing agent was carried out by...