Microwave Treatments and Their Effects on Selected Properties of Portuguese Pinus pinaster Aiton. and Eucalyptus globulus Labill. Wood

Author:

Mascarenhas Fernando Júnior Resende12ORCID,Dias Alfredo Manuel Pereira Geraldes12,Christoforo André Luis3ORCID,Simões Rogério Manuel dos Santos4ORCID,Cunha André Eduardo Palos4ORCID

Affiliation:

1. ISISE, Department of Civil Engineering, Rua Luís Reis Santos—Pólo II, University of Coimbra (UC), 3030-788 Coimbra, Portugal

2. SerQ—Innovation and Competence Forest Centre, Rua J, N° 9, Zona Industrial da Sertã, 6100-711 Sertã, Portugal

3. Department of Civil Engineering, Federal University of São Carlos (UFSCar), Rodovia Washington Luís (SP-310), Km 235, São Carlos 13565-905, Brazil

4. Unit of Fiber Materials and Environmental Technologies (FibEnTech-UBI), Department of Chemistry, University Beira Interior (UBI), 6201-001 Covilhã, Portugal

Abstract

The most widespread wood species in the Portuguese forest and the most widely utilized are maritime pine (Pinus pinaster) and eucalyptus (Eucalyptus globulus Labill). In the case of eucalyptus, except for the pulping sector, it might have limited usage due to drying issues and low permeability. Microwave (MW) treatment is a technology that has been used to improve wood species’ permeability. Therefore, the present paper aimed to evaluate the MW treatment of both Portuguese wood species and to investigate the effects of different MW treatments on wood’s density, water uptake capability, modulus of rupture (MOR), and modulus of elasticity (MOE). Using small clear wood specimens, two MW powers were used, 700 and 1200 W, and the samples were submitted to successive MW cycles of 2 min till they reached the required dryness. The results showed that each wood species had a different behavior during the MW drying in terms of drying rate, supply, and consumption of energy. In general, with the increase in MW power, the densities of both species decreased and the water uptake increased, as a possible indicator that a certain level of microstructural damage might have occurred. Regarding the mechanical properties of MW-treated maritime pine and eucalyptus wood specimens, under the harshest conditions (MW power of 1200 W), MOR and MOE were reduced compared with the wood sample without MW treatment.

Funder

Foundation for Science and Technology—FCT

Institute for Sustainability and Innovation in Structural Engineering

Publisher

MDPI AG

Subject

Forestry

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