Performance of polyurea-coated Douglas-fir timbers exposed in Hilo Hawaii
| Autor: | Mathew J. Konkler, Jed Cappellazzi, Jeffrey J. Morrell |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
040101 forestry
0106 biological sciences Fungal attack Chemistry Forestry 04 agricultural and veterinary sciences engineering.material 01 natural sciences Horticulture chemistry.chemical_compound Coating 010608 biotechnology Antrodia sinuosa engineering 0401 agriculture forestry and fisheries General Materials Science Douglas fir Polyurea |
| Zdroj: | International Wood Products Journal. 10:31-36 |
| ISSN: | 2042-6453 2042-6445 |
| DOI: | 10.1080/20426445.2019.1601825 |
| Popis: | The potential for polyurea coatings to improve wood crossarm performance was assessed on untreated and treated Douglas-fir exposed to termite/fungal attack in Hawaii. Treated materials performed similarly regardless of coating, although coating reduced UV damage. Untreated non-coated timbers were decayed within 2-years of exposure and were unserviceable after 7 years. Upper surfaces of coated, untreated samples experienced pronounced coating loss and contained advanced decay on the undersides of the timbers, but no decay occurred on coated, treated samples. Decay fungi were isolated from treated and non-treated coated arms, but isolation frequency was greater for non-treated materials. Coating thickness declined on both treated and non-treated materials, but the effects were greater on non-treated samples. Termites did not attack treated samples with or without coating, but destroyed untreated, non-coated samples and penetrated the polyurea coating to destroy untreated and borate dipped Douglas-fi... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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