SURFACE CHARACTERISTICS OF CCA TREATED SCOTS PINE AFTER ACCELERATED WEATHERING

摘要

Some surface characteristics such as surface hardness, gloss, and colour characteristics of wood treated with CCA (chromated copper arsenate) after accelerated weathering were investigated. Wood specimens were prepared from air-dried sapwood of Scotspine (Pinus sylvestris L.). Before tests, wood specimens were impregnated with 6.25,12.50, and 25.00 percent aqueous solutions of CCA.The results showed that CCA treatment caused increases in gloss and surface hardness of Scots pine after accelerated weathering. While the decrease in L* values of Scots pine indicates that the specimens became darker, positive values of triangle opena*and triangle openb* indicate a tendency in wood surface to become reddish and yellow, respectively. Total changes in colour (triangle openE*) exhibited a systematic trend to higher values with increasing accelerated weathering time. triangle openE* of CCA treated Scots pine was lower than untreated Scots pine. Generally, surface characteristics of CCA treated Scots pine gave better results than untreated Scots pine after accelerated weathering.