我が国における結露マップの提案 : 高分子系建築材料の耐久性に関する研究(その2)

抄録

Some deteriorations of polymeric building materials are caused by dissolusion of stabilizers and anti-degradation agents and hydrolyzation of base polymers. These chemical changes can be determined quantitatively by the wetness time. Dry wet cycle is an index of another type of moisture degradation which occurs under thin water layer, where water and oxgen in the atmosphere produce corrosion of metals under polymer coatings. The moisture in the air condenses into dew on the cooled surface of materials when it comes below dew point. The ISO/TC 156 WG 4 generalized that the meteological conditions of dewing occure humidity is higher than 80 % RH, also temperature is higher than the freezing point. According to this standard, wetness time and wet-dry cycle are calculated from meteorological data in Japanese observatories of recent 25 years. The estimated data are plotted on the map for discussing the differeneces of materials deteriorations by wetness.