Abstract—This paper presents experimental results for shear strengths of glue lines of glued laminated timber (GLT) made from hardwoods. GLT samples were produced from Carpinus Betulus L., Quercus Cerris L. and Acer Campestre L., all harvested in Croatian forests. For each hardwood species three sets of samples were produced varying different surface treatments. The adhesive used is melamine-urea. The results presented here show that surface treatment made no difference on shear strength of glue lines for GLT made from Turkey oak and Maple, while it had some influence on shear strength of glue lines for GLT made from European hornbeam, with roughest surface treatment being least favorable.

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