Influence of the accelerated ageing chosen species of wood from East-Southern Asia on compressive strength along the fibres.
This study investigated the changes (compressive strength along the fibres) occurring in exotic wood species originating from East-Southern Asia: teak (Tectona grandis), merbau (Intsia sp.) and yellow balau (Shorea laevis) under the influence of artificial aging. A total of 121 artificial aging cycles (corresponding to ageing in open air for 11 years in the temperate climate typical of the area of Poland) were conducted. The colour of the wood samples was changed as a result of accelerated aging. At first the colour became darker and then turned grey-ashen. Cracks on surfaces appeared as a result of the aging process. Aging also caused a decrease in density of the tested wood species. Artificial aging decreased the densities of merbau wood from 772 to 717 kg/m3, of teak from 562 to 528 kg/m3, and of yellow balau from 991 to 864 kg/m3. Artificial aging decreased compressive strength of merbau, teak and yellow balau from 91.4 to 57.9 MPa, from 71.8 to 65.6 MPa and 131.1 to 111.6 MPa, respectively.