Impact of Growth Characteristics on Properties of 2 by 8 Southern Yellow Pine Structural Lumber

IF 1.1 4区农林科学 Q3 FORESTRY

Forest Products Journal Pub Date : 2023-12-01 DOI:10.13073/fpj-d-23-00027

T. S. A. Franca, F. França, R. D. Seale, R. Shmulsky

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Abstract

Southern pine is one of the most important softwood resources in the United States, and the majority of southern pine is for lumber production, more specifically for construction. The lumber used for construction is required to meet strength-specifications as a method of ensuring the strength values within different classes. Most of the southern pine lumber is visually graded, which is based on knot, slope of grain, and wane. However, the presence of pith is not included in the visual grading system. The presence of pith indicates presence of juvenile wood, which has a negative effect on mechanical properties. The objective of this study was to evaluate the effect of pith on rings per inch, percentage of latewood, modulus of elasticity (MOE), and modulus of rupture (MOR) in 292 samples of southern pine No. 2 2 by 8 lumber. Lumber without pith had significantly greater MOE (11.1 vs. 10.0 GPa), MOR (39.7 vs. 36.4 MPa), and specific gravity (12% moisture content [MC]; 0.55 vs. 0.52) than did lumber with pith. The results show that the presence of pith is an important factor that can improve lumber grading, and it could be included in the visual grade system.

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生长特性对 2 乘 8 南方黄松结构木材特性的影响

南方松是美国最重要的软木资源之一，南方松大部分用于木材生产，更具体地说是用于建筑。建筑用木材必须符合强度规范，这是确保不同等级木材强度值的一种方法。大部分南方松木材都是根据节疤、纹理斜度和凹凸度进行目测分级的。然而，髓部的存在并不包括在目测分级系统中。髓的存在表明存在幼木，而幼木会对机械性能产生负面影响。本研究的目的是评估髓对 292 个南方松 2 号 2 乘 8 木材样本中的每英寸年轮、晚材百分比、弹性模量（MOE）和断裂模量（MOR）的影响。无髓木材的 MOE（11.1 GPa 对 10.0 GPa）、MOR（39.7 MPa 对 36.4 MPa）和比重（12% 含水率 [MC]；0.55 对 0.52）明显高于有髓木材。结果表明，髓质的存在是可以改善木材分级的一个重要因素，可以将其纳入目测分级系统。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Forest Products Journal 工程技术-材料科学：纸与木材

CiteScore

2.10

自引率

11.10%

发文量

审稿时长

6-12 weeks

期刊介绍： Forest Products Journal (FPJ) is the source of information for industry leaders, researchers, teachers, students, and everyone interested in today''s forest products industry. The Forest Products Journal is well respected for publishing high-quality peer-reviewed technical research findings at the applied or practical level that reflect the current state of wood science and technology. Articles suitable as Technical Notes are brief notes (generally 1,200 words or less) that describe new or improved equipment or techniques; report on findings produced as by-products of major studies; or outline progress to date on long-term projects.