| "Following the results of surveys targeting related government ministries and agencies, industry organizations, local governments, etc., it has become clear that Fiber Reinforced Plastics (FRP) have been applied to members of hydraulic gates since the 1960s with over 400 structures now existing in Japan. Fifty FRP gates were visually inspected. Though they have been only lightly maintained over 30 years, little deterioration is evident. Results of durability tests with FRP specimens in the laboratory indicate that FRP for hydraulic gates has satisfactory water and corrosion resistance, though appearance gradually deteriorates from exposure to ultraviolet light." |
