Weatherability of sugi(Cryptomeria japonica D. Don)sound barriers- Enhanced performance of coatings applied on preservative-treated wood -

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  • スギ製遮音壁の耐候性-保存薬剤注入処理による塗装耐候性向上効果-
  • スギセイシャオンヘキ ノ タイコウセイ : ホゾン ヤクザイ チュウニュウ ショリ ニ ヨル トソウ タイコウ セイコウ ジョウ コウカ

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Abstract

Three full scale models of wood sound barrier walls were made either of DDAC or CUAZ pressure-impregnated, or untreated sugi (Cryptomeria japonica D. Don) wood, and a half of each wall surface was finished with five wood preservative semitransparent coatings (3 water-borne and 2 solvent-borne). The wall models were then weathered for 108 months (9 years) at 90 degrees facing south and north in Tsukuba, and the effects of wood preservative treatments on the weatherability of coatings were examined. Service life of most coatings lasted for more than 108 months in the case of CUAZ-treated wood and coating performance decreased in the order: CUAZ-treated > DDAC-treated> untreated wood. Color stability also decreased in the same order, and several coatings applied on CUAZ-impregnated wood showed an excellent color stability, E *ab less than 7, during 108 months. These results indicate that long-term weatherability of wood coatings was improved when they were applied on CUAZ or DDAC-impregnated wood. It is also suggested that a maintenance cycle of wood wall coating as long as 10 years can be achieved by using a good combination of wood preservatives and wood preservative semitransparent coatings.

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