Application of radio-frequency heating to utility poles. 2. Accelerated fixation of chromated copper arsenate
2001
Fang, F. | Ruddick, J.N.R. | Avramidis, S.
The use of radio-frequency (RF) heating at atmospheric pressure to accelerate the fixation of chromated copper arsenate (CCA) in roundwood was investigated. This was done using the hexavalent chromium (Cr(VI)) color reaction with chromotropic acid and by analysis of leachable Cr(VI) from sample borings/shavings. The fixation time was greatly reduced by heating the pole sections to above 80 degrees C at high humidity. All three wood species used in this study required less than 6 hours to achieve complete fixation of the CCA. This fixation time was further reduced by using the stored heat to complete the process. Following the RF fixation, the moisture content of the treated sapwood had been reduced by 50 to 90 percent, although it remained well above the fiber-saturation point.
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