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首页> 外文期刊>South-East European Forestry >Characterization of Eucalyptus maidenii Timber for Structural Application: Physical and Mechanical Properties at Two Moisture Conditions
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Characterization of Eucalyptus maidenii Timber for Structural Application: Physical and Mechanical Properties at Two Moisture Conditions

机译：结构用桉树木材的表征：两种水分条件下的物理和机械性能

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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.
机译：背景和目的：桉树是多种工业用途的重要原料。但是，某些桉树精髓仍未得到充分利用，这可能是由于缺乏有关其性质的更多信息所致。通过这种方式，无花桉树种具有广阔的潜力，其木材利用也颇受关注。然而，如本文所述，对其物理和机械性能的完全确定无疑可以鼓励其在建筑中的普及。材料和方法：关于来自巴西国家标准组织（ABNT）和美国测试材料学会（ASTM）的标准文件，少女桉树评估包括两个物理参数和十四个机械参数。因此，对木材样品的水分含量进行了简单的比较，通过两个条件对其进行了评估：初始含量为30％，标准含量为12％。通过t检验对所有结果进行统计学评估。在16个参数中，进行了3​​10次测定。结果：随着分析水分的减少，一半的机械性能表现出其电阻的显着变化。当水分含量从30％降低到12％时，静态弯曲和垂直压缩时的断裂模量，垂直压缩时的弹性模量，切向劈裂强度，剪切应力以及垂直和平行硬度均增加了它们的抵抗力。从绿色到干燥的标准稳定点。在评价条件下，堆积密度也改变，减小到较小的值。在此研究条件下，体积质量密度，平行压缩以及平行和垂直拉伸中的断裂模量，以及静态弯曲和平行压缩与拉伸中的弹性模量和切向韧性均未显示其值的任何改变。结论：民用建筑用木材需要适合有效应用，空气平衡，水分含量一般应达到国际标准文件要求的12％。作为其一部分，研究了机械和物理性质/参数以表征初生桉树木材的水分含量。获得的结果表明，从人工林中提取的这种精华素在建筑中用于结构目的。

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