Outdoor Exposure Test for Sugi Glued-Laminated Timber Manufactured Using 7 Adhesive Resins I.

Yanagawa Yasuo, Harata Mitsuyoshi

doi:10.2488/jwrs.63.34

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7種類の接着剤で作製したスギ集成材の屋外暴露試験（第1報）
7種類の接着剤で作製したスギ集成材の屋外暴露試験(第1報)せん断強度および木部破断率
7シュルイノセッチャクザイデサクセイシタスギシュウセイザイノオクガイバクロシケン(ダイ1ポウ)センダンキョウドオヨビモクブハダンリツ
せん断強度および木部破断率
Shear strength and wood failure ratio

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Abstract

<p>Five-ply sugi (Cryptomeria japonica D.Don) glued-laminated timbers were manufactured using three resorcinol resin adhesives, three aqueous polymer-isocyanate resin adhesives, and a vinyl acetate-based resin emulsion adhesive (VAE). They were impregnated with wood-preservative (ACQ), and exposed under outdoor conditions with their glue-layers at level position for ten years. Block-shear tests were conducted after 1, 3, 5, and 10 years of exposure. After 10 years of exposure, significant differences were recognized for shear-strength among adhesive resins as the result of analysis of coefficient variance (AOCV). Results for pair-comparison of AOCV between adhesive resins, showed significant differences in 4 pair-comparisons and those included VAE. Standard deviations of shear-strength tend to increase with exposure year, and for VAE they were larger than for the others. Results of goodness-of-fit tests of shear-strength for normal, log-normal, 2P-Weibull, and 3P-Weibull distributions, showed that none of these forms fit VAE after 1 year of exposure. Wood-failure ratio decreased gradually with exposure duration ; however, even after 10 years of exposure, it was more than 80% regardless of adhesive resin.</p>

Journal

Mokuzai Gakkaishi

Mokuzai Gakkaishi 63 (1), 34-40, 2017

The Japan Wood Research Society

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