Abstract
The carbonation of reinforced concrete structures, the corrosion of steel by salt damage, the frost damages, the alkali-silica reactions are deeply related to moisture content in concrete. Therefore, by giving the exposure tests in Narashino, Chiba to show some effect that is doing to behaviors of moisture content in concrete, depending on the PVC sidings.In addition, when examining for protective effect of reinforced concrete, it is important to have durability of PVC sidings and clamps, so this report contains the results about these matericals which giving the exposure tests in Tomari, Hokkaido, Benoki, Okinawa, and Narashino, Chiba.