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The reduction of wood response to variations of ambient humidity, describedas kind of ageing, has been studied from both points of view of moisture uptakeand dimensional changes. Clearwood specimens from 3 gymnosperms (Pinussylvestris L., Pinus pinaster Ait., Pinus insignis Dougl.) and 4 angiosperms(Populus spp., Quercus pyrenaica Willd., Entandrophragma cylindricum Sprague,Chlorophora excelsa Benth. & Hook f.) were subjected to five wet-dry cycles andtheir moisture content and dimensional changes in radial and tangentialdirection at three increasing levels of relative humidity (57.6, 84.2 and90.2%) were measured before and after the treatment. For a given increase ofrelative humidity, a coefficient of hygroscopic ageing was defined as therelative decrease of moisture uptake, and the coefficient of dimensional ageingas the difference of swelling strain before and after ageing. All speciesexhibited a clear ageing effect, much stronger in the wet range than in the dryrange. Calculation of swelling coefficients suggested that in some cases therelation between swelling strain and moisture content is no longer linear inaged wood.

Reduction of wood hygroscopicity and associated dimensional response by repeated humidity cycles