Sohta TAKATSU
The Relationship Between Airborne Salt and Landform, Wind in Niigata
Eigi IWASAKI, Masatsugu NAGAI
It is well known that airborne salt has bad influence on structures. It is the main cause to drop durability irrespective of concrete structure or steel structure.ˇˇWeathering steel is known as a type of steel that is especially affected by airborne salt in them. Because this steel is used by unpainted. In use of the weathering steel, users are must measure airborne salt amount for one year and must be less than 0.05mdd(mg/dm2/day). However, large labor and time become necessary for the measurement in order to change through season. Therefore if distance of coastline is longer than specific distance, the measurement of airborne salt is able to omit.
In this study, following procedures are carried out. Airborne salts are predicted using wind data by AMeDAS and measurement data for airborne salt in Niigata.Because predicted airborne salt including error, landform and the direction of wind are discussed. As a result, it can be judged that direction of wind influences the amount of airborne salt. Finally, measurement method of airborne salt is developed. this method is not affected by direction of apparatus.
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