Preliminary communication
https://doi.org/10.15177/seefor.18-10
Characterization of Eucalyptus maidenii Timber for Structural Application: Physical and Mechanical Properties at Two Moisture Conditions
Marta Cristina de Jesus Albuquerque Nogueira
; Federal University of Mato Grosso (UFMT), Department of Architecture, Av. Fernando Corrêa da Costa, BR-78060900 Cuiabá/MT, Brazil
Victor Almeida De Araujo
orcid.org/0000-0002-2747-4738
; Research Group on Development of Lignocellulosic Products (LIGNO), Rua Geraldo Alckmin 519, BR-18409010 Itapeva/SP, Brazil
Juliano Souza Vasconcelos
; São Paulo State University, Faculty of Agricultural Sciences (FCA-UNESP), Av. Universitária 3780, BR-18610034 Botucatu/SP, Brazil
José Nilton Da Cruz
; Federal University of Mato Grosso (UFMT), Department of Statistics, Av. Fernando Corrêa da Costa, BR-78060900 Cuiabá/MT, Brazil
ulio Cezar Souza Vasconcelos
; University of São Paulo (ESALQ-USP), Department of Exact Sciences, Av. Padua Dias 11, BR-13418900 Piracicaba/SP, Brazil
Fabio Prataviera
; University of São Paulo (ESALQ-USP), Department of Exact Sciences, Av. Padua Dias 11, BR-13418900 Piracicaba/SP, Brazil
André Luis Christoforo
; Federal University of São Carlos (UFSCar), Department of Civil Engineering, Rod. Washington Luís, BR-13565905 São Carlos/SP, Brazil
Francisco Antonio Rocco Lahr
; University of São Paulo (EESC-USP), Department of Structures Engineering, Av. Trabalhador Sãocarlense 400, BR-13566120 São Carlos/SP, Brazil
Abstract
Background and Purpose: Eucalypt is an important raw material source of several industrial purposes. However, some eucalypt essences are still underutilized, possibly due to the lack of more embracing information about their properties. In this way, Eucalyptus maidenii species has presented a wide potential, and its lumber utilization is somewhat interesting. Nevertheless, a complete determination of its physical and mechanical properties, as carried out in this paper, certainly could encourage its popularization in construction.
Materials and Methods: Eucalyptus maidenii evaluation included two physical and fourteen mechanical parameters, regarding standard documents from Brazilian National Standards Organization (ABNT) and American Society of Testing Materials (ASTM). Thus, a simple comparison was established concerning the moisture content of wood samples, which were evaluated through two conditions: 30% as the initial level and a standard at 12%. All results were statistically evaluated by t-test. In sixteen parameters, 310 determinations were carried out.
Results: Half of mechanical properties presented significant changes in their resistances with the analysed moisture reduction. Modulus of rupture in static bending and in perpendicular compression, modulus of elasticity in perpendicular compression, strength in tangential cleavage, shear stress, and perpendicular and parallel hardnesses increased their resistances when the moisture content was reduced from 30% to 12%, that is, from green to dried standard stable point. Bulk density was also changed in the evaluated condition, decreasing to a smaller value. Volumetric mass density, modulus of rupture in parallel compression and in parallel and perpendicular tensiles, as well as modulus of elasticity in static bending and in parallel compression and tensile, and tangential toughness did not show any alteration in their values with this studied condition.
Conclusions: Lumber for civil construction needs to be suitable for efficient application, with air equilibrium, generally at 12% of moisture content as international normative documents require. As part of this, mechanical and physical properties/parameters were studied to characterize Eucalyptus maidenii wood regarding moisture content. The results obtained indicate the use of this essence from planted forests for structural purposes in construction.
Keywords
Maiden’s Gum; wood density; strength modulus; cleavage; shear stress; hardness; toughness
Hrčak ID:
214131
URI
Publication date:
22.12.2018.
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