Alteration of Bending Properties of Wood Due to Ammonia Treatment and Additional Densification

This paper deals with comparative studies of bending behavior untreated and modified European beech (Fagus sylvatica L.), oak (Quercus spp.) black locust (Robinia pseudoacacia L.). The modification the woods included both ammonia treatment in combination mechanical densification. For each treatment, pure gaseous was used. investigations were conducted by means three-point tests. bulk density increases significantly due to and, furthermore, additional modulus rupture is not affected treatment. Additional densification, however, leads a strong increase strength stiffness. deflection changes such way that an deflection, densification further reinforces this trend.