Impact of fixation/drying conditions on fixation rate, teachability and bioefficacy in CCA-C treated red pine and southern pine |
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Authors: | Guo Ai-Long Y T Ung P A Cooper |
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Institution: | (1) Faculty of forestry, University of Toronto, Eath Science Center, 33 Willcocks Street, M5J 3B3 Toronto, Ontario, Canada |
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Abstract: | Red pine (Pinus resinosia Ait) and southern pine (Pinus spp.) sapwood blocks were pressure treated with CCA-C at retention of 6.4, 2.0, 1.5 kgm-3 followed by fixation using 11 post-treatment schedules ranging from 50–70 °C and 5 different relative humidity conditions.
The effect of these post-treatment schedules on fixation rate, chemical leachability and decay resistant once were evaluated
to better understand the effects of fixation/drying conditions on leachability and biodeterioration. Southern pine blocks
fixes slightly slower than red pine. Fixation of CCA at high temperature high humidity, essential initially fixation at high
humidity for fixation/drying schedules, resulted in lower leaching of chromium and arsenic elements than high temperature
low humidity or initially fixation at the high temperature low humidity conditions. Copper leaching was indicated no significant
difference under 11 fixation/drying conditions for both species. Weight losses for southern pine byChaetomium globosum was lower than red pine byGloeophyllom trabeum. There were some different capacities of decay resistance for both species under those post treatment conditions. |
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Keywords: | Red pine Southern pine Boiefficacy Leachablity Fixation rate CCA-C Temperature Humidity |
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