Outdoor Exposure Test of Sugi Glued-Laminated-Timber Manufactured with 7 Adhesive Resins II.

Yanagawa Yasuo, Harata Mitsuyoshi

doi:10.2488/jwrs.64.10

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Other Title

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<b>2</b>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2報)部位別の劣化
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2ホウ)ブイベツノレッカ
部位別の劣化
Deterioration according to position

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Abstract

<p>Sugi five-ply glued-laminated-timbers (GLT) were manufactured using 3 resorcinol resin adhesives, 3 water-based-polymer-isocyanate resin adhesives, and vinyl-acetate emulsion adhesive (VAE). GLTs were treated with wood preservative, ACQ (Alkaline Copper Quaternary), and exposed under outdoor conditions with their glue-layers positioned horizontally for ten years. After one, three, five, and ten years of exposure, block-shear test were conducted and deterioration of GLT according to position was investigated. Residual ratio of shear-strength increased in order of south-side, north-side, and middle of south-side and north-side positions. Deterioration rates of shear-strength at south-side were larger than those at north-side. Decrease and deterioration rate of shear-strength were large at upper glue-layers, and this was conspicuous in VAE with low adhesion durability. Wood-failure ratio decreased at the first glue-layer of VAE after five year of exposure. However, in other adhesive resins, differences of wood-failure ratio among position or glue-layers were small regardless of exposure duration.</p>

Journal

Mokuzai Gakkaishi

Mokuzai Gakkaishi 64 (1), 10-16, 2018

The Japan Wood Research Society

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