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Comparison between heat treated sapwood and heartwood from Pinus pinaster |
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| Authors: | Bruno Esteves Lina Nunes Idalina Domingos Helena Pereira |
| Affiliation: | 1. Polytechnic Institute of Viseu, Portugal and Centre for the Study of Education, Technologies and Health (CI&DETS), Viseu, Portugal 2. National Laboratory for Civil Engineering (LNEC), Lisbon, Portugal 3. Timber Structures Division, Structures Department, Azorean Biodiversity Group (CITA-A), Platform for Enhancing Ecological Research and Sustainability (PEERS), Universidade dos A?ores, Terceira, Azores, Portugal 4. Forest Research Centre (CEF), School of Agriculture, Technical University of Lisbon, Lisbon, Portugal |
| Abstract: | Sapwood and heartwood samples of Pinus pinaster were treated in an oven at 190 and 200 °C for 2–6 h. Dimensional stability, measured as Anti Shrinking Efficiency (ASE) between 0 and 65 % relative humidity, durability against fungi, mechanical resistance (MOE and MOR), hardness and chemical composition were determined for treated and untreated sapwood and heartwood. Radial ASE reached 52 % for sapwood and 50 % for heartwood, while tangential ASE reached 50 and 40 %, respectively. MOE increased slightly at the beginning of the treatment, decreasing afterwards. No significant differences were found between sapwood and heartwood. MOR decreased by 50 and 30 % for sapwood and heartwood, respectively. A significant increase in durability against Rhodonia placenta was found for both heartwood and sapwood at the higher temperature (200 °C), but at the lower temperature (190 °C) only heartwood showed good results. |
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