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Impacts of boron compounds, imersol-aqua and timbercare-aqua on the screw withdrawal strength of some woods

Musa Atar, Ybrahim Acykel, Hakan Keskin*

The aim of this study was to investigate the effects of impregnation with Boron compounds (Borax (Bx), Boric acid (Ba), Bx+Ba (wt:wt 50:50%)), Imersol-Aqua (Ia) and Timbercare-Aqua (Ta) on the screw (S) withdrawal strength of some solid wood materials. For this aim, Oriental beech (Fagus orientalis Lipsky), European oak (Quercus petrea Liebl.) and Scotch pine (Pinus sylvestris Lipsky) wood samples were prepared according to TS EN 13446 and impregnated with Boron compounds, Imersol-Aqua and Timbercare-Aqua according to ASTM D 1413, TS 344, TS 345 and directions of the manufacturer. After the impregnation process the screw withdrawal strength was measured according to TS EN 13446. Consequently, among the wood types, withdrawal strength was found to be the highest in European oak (4.049 Nmm-2) and the lowest in Scotch pine (2.583 N.mm-2). As for the screw diameter, the withdrawal strength was obtained the highest in S1 (3.5 mm) (3.564 N.mm-2) and the lowest in S2 (4 mm) (3.480 N.mm-2). Considering the interaction of wood types, impregnation chemicals and screw diameters, the withdrawal strength were obtained in European oak + Bx + S1 (4.481 N.mm-2) whereas the lowest was in Scotch pine + Ta + S1 (2.369 N.mm-2). In consequence, it was seen that the impregnation process increased the screw withdrawal strength. It can be said that, in the applications, the pieces that are impregnated with Bx and connected with S1 at the surface shall display the highest strength.