Comparative Studies on Two Types of OSB Boards Obtained from Mixed Resinous and Fast-growing Hard Wood

Aurel Lunguleasa,Adela-Eliza Dumitrascu,Valentina-Doina Ciobanu

doi:10.3390/app10196634

Aurel Lunguleasa, Adela-Eliza Dumitrascu + Show 1 more

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https://doi.org/10.3390/app10196634

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Journal: Applied Sciences	Publication Date: Sep 23, 2020
Citations: 8	License type: CC BY 4.0

Affiliation: Transylvania University of Brașov

Abstract

The paper aims to compare the oriented strand boards (OSBs) made in the laboratory from a mixture of softwood species to those made from hardwood species, followed by their comparison to European and industry standards. In this regard, the main properties of the panels made in the laboratory were determined, including density, absorption, and swelling in thickness, modulus of elasticity, modulus of rupture, and internal bond. The analysis of the properties of swelling (24 h) and absorption (24 h) revealed that the mixture of softwood species was slightly better thanthe hardwood one. It was also shown that the panels manufactured from the mixture of hardwood species had better mechanical properties than those made of the softwood mixture (modulus of rupture (MOR) = 43.48 N/mm2, modulus of elasticity (MOE) = 7253 N/mm, and internal bond (IB) = 1.57 N/mm2). Additionally, the comparative analysis of properties indicates that the density is highly significant in determining the MOE values of the OSBs. This will allow softwood speciestobe replaced with other species of soft and fast-growing deciduous trees such as willow, birch, and poplar in the manufacture of oriented strand boards.

Highlights

Oriented strands boards (OSBs) are increasingly sought after on the construction materials market due to its excellent properties, especially due to the increasingly competitive price
oriented strand boards (OSBs) made of mixed hardwood, the estimated mean values of the densities were similar for kg/m3 and for mixed hardwood OSBs 719.1 kg/m3
The analysis indicates that the density is highly significant in determining modulus of elasticity (MOE) values of OSBs manufactured from both mixed species.This can be explained by the fact that the elasticity of the boards is dependent on other factors than the strength and thickness properties [38]

Summary

Introduction

Oriented strands boards (OSBs) are increasingly sought after on the construction materials market due to its excellent properties, especially due to the increasingly competitive price. The three layers are symmetrical, the core layer is thicker, ensuring high dimensional stability and balanced strength in the direction parallel to the fibers of the surface chips (in the direction of board length or major axis), and perpendicular to them (in the direction of board width or minor axis). From this last point of view, OSBs are almost similar to plywood; one difference could be thatthe price of OSBs is much lower than plywood, which it successfully replaces today in the construction field

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