Physical and mechanical properties of particleboard P4 depending on moisture content
2018
Kask, R., Estonian Univ. of Life Sciences, Tartu (Estonia). Inst. of Forestry and Rural Engineering | Lille, H., Estonian Univ. of Life Sciences, Tartu (Estonia). Inst. of Forestry and Rural Engineering | Ljahov, J., Estonian Univ. of Life Sciences, Tartu (Estonia). Inst. of Forestry and Rural Engineering | Rebane, A., Estonian Univ. of Life Sciences, Tartu (Estonia). Inst. of Forestry and Rural Engineering
Strand type composite panels such as particleboard is one of the wood based engineering products, which is most commonly used for cladding of wall and ceiling indoors or outdoors, as a floor decking material and wind barrier. The particleboard panel as a wood-based sheet is a hygroscopic material and its mechanical and physical properties depend on its moisture content and on surrounding temperature. This type of material is also applied for structural purposes in load bearing structures as rigidity material only for use in dry conditions (e.g. P4 (EVS-EN 312:2010 [1]). Test methods determined by the European Standard (EN) were applied to study changes in modulus of rupture (MOR), modulus of elasticity (MOE) at bending, thickness swelling (TS), linear expansion (LE) and Janka hardness (JH) at different moisture contents. Changes in MOR, MOE, JH, TS and LE for different soaking times were investigated in a Master’s thesis [2, 3]. The basic method involves soaking of specimens in water for a controlled period of time (2; 4; 6; 8; 16 and 24 hours), at room temperature (22±1°C), and testing them after pre-treatment in water with the universal test machine INSTRON 3369; drying (48 hours) of specimens in a ventilated drying box at 65±1°C, in order to determine moisture content. These procedures are followed by output of data and analysis of obtained results. The sensitivity of the measured data was studied and the expanded uncertainties of the computed mean values are presented. A logarithmic function was used for approximation of the change in the physical and mechanical properties of the samples depending on their moisture content.
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