Abstract
This paper investigates the effects of the glue line, moisture content, and temperature on diffusion coefficients of engineered wood products. The diffusion coefficient were measured in three orthogonal directions for glued laminated timber (Glulam) made of Blackbutt (Eucalyptus pilularis), Pacific Teak (Tectona grandis), Tasmanian Oak (Eucalyptus regnans/obliqua/delegatensis), Radiata Pine (Pinus radiata), Slash Pine (Pinus elliottii), Laminated Veneer Lumber (LVL) made of Radiata Pine, and Cross Laminated Timber (CLT) made of Norwegian Spruce (Picea abies). Experiments were conducted on specimens with and without glue line at four different temperatures, i.e. 15, 25, 35, and 45 °C and three different relative humidity gradients. Adsorption isotherms were obtained, and analytical equations were fitted to the experimental data to determine the diffusion coefficient of wood as a function of temperature and moisture content. The diffusion coefficient showed a strong dependency on the temperature and moisture content, highlighting the importance of accounting for these factors in modelling of moisture transport and analysis of drying stresses, distortion and warping, as well as long-term serviceability analysis of the timber elements.
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