Durability of glued or nailed wood joints after exposure to sea water.
1990
Sakuno T. | Lee J.S. | Kawada T. | Tanaka K.
Three-ply double lap shear specimens were prepared using beech wood as core. On both sides are solid wood (Buna and Akamatsu) and wood-based materials (plywood and fiberboard). Three types of joints were made, namely, glued joint using resorcinol and water-soluble polyvinyl isocyanate as abhesives, nailed joint and nailed glue joint. The specimens were treated with sea water and fresh water by vacuum soak and dry repeat exposure. After exposure, the maximum load to failure of the specimens and the accumulated salt content were measured and the data was analyzed. The durability of any type of joint (maximum load to failure) decreased compared with the unexposed ones. The decrease in strength was more conspicuous in the case of wood based materials in the solid wood. Nevertheleless, there was no significant difference between the salt water and the fresh water treatment, between glue joint and nailed glue joint, and within different adhesives. The salt content of the specimen increased with the increase in the number of cycles. Inverse correlation between joint strength and the number of cycles were observed.
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