Abstract
Boukawa bridge is located at the Boukawa forest road in Takanosu District Forest Office, Akita. This bridge is glued laminated grillage girder bridge with laminated deck panels and steel cross beam. In this bridge, water-borne preservative treatment were provided to main girders, deck panels and curb. The bridge elements were pressure-impregnated of 2% solution CCA1. The present paper is concerned with the influence of pressure-impregnated preservative treatment and asphalt pavement on the strengths for glued laminated timbers. Through the tests, the effect of pressure treatment on bonding strength is small and negligible, and also any deterioration of strength properties are hardly recognized in the impregnated glued laminated timbers.
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