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首页> 外文期刊>Journal of Tropical Forest Science >Accelerated and outdoor ageings of laminated veneer lumber and their correlations with strength and stiffness.
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Accelerated and outdoor ageings of laminated veneer lumber and their correlations with strength and stiffness.

机译：层压单板木材的加速老化和室外老化及其与强度和刚度的关系。

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摘要

This study evaluated the effect of accelerated ageing treatment (AAT) and outdoor ageing on properties of bintangor (Callophyllum sp.) laminated veneer lumber (LVL). It established the strength correlations between AAT and outdoor ageing under tropical climate. LVLs of 1220 mm x 2440 mm were fabricated using veneers of 3.1 and 4.1 mm, producing 13- and 17-ply panels respectively. Static bending and bending shear tests were used to determine the strength of LVL after ageing. For AAT, a cyclic boil-dry (CBD) treatment was employed where specimens were submerged in boiling water for 2 hours followed by drying in an oven for 18 hours. The process was carried out for 1, 2, 5 and 10 cycles. Long-term outdoor ageing involved exposure to the tropical weather for 3 and 6 months. At each cycle and duration of exposure to the outdoor, specimens were evaluated for modulus of rupture (MOR) and modulus of elasticity (MOE) in static bending and bending shear. Statistical analysis showed that properties of bintangor LVL were significantly influenced by veneer thickness, number of CBD cycle and duration of outdoor ageing. LVL produced from thinner veneers had higher mechanical properties than that produced from thicker veneers. The former had lower property reduction after exposure to CBD treatment and outdoor ageing. The results also revealed that MOR and MOE after 2, 5 or 10 cycles of CBD treatment had high correlations with properties after 3 and 6 months of outdoor ageing.
机译：这项研究评估了加速老化处理（AAT）和室外老化对Bintangor（Callophyllum sp。）层压单板木材（LVL）性能的影响。它建立了热带气候下AAT与室外老化之间的强度关系。使用3.1毫米和4.1毫米的贴面制作了1220毫米x 2440毫米的LVL，分别生产了13层和17层的面板。静态弯曲和弯曲剪切试验用于确定老化后LVL的强度。对于AAT，采用循环干烧（CBD）处理，其中将标本浸入沸水中2小时，然后在烤箱中干燥18小时。该过程进行1、2、5和10个循环。长期的室外老化需要在热带气候中暴露3到6个月。在暴露于室外的每个周期和持续时间下，评估样品在静态弯曲和弯曲剪切下的断裂模量（MOR）和弹性模量（MOE）。统计分析表明，Bintangor LVL的性能受贴面厚度，CBD循环数和户外老化时间的影响很大。用薄木皮制成的LVL的机械性能要比用薄木皮制成的LVL高。前者在接受CBD处理和户外老化后，其性能下降较低。结果还表明，在CBD处理2、5或10个周期后，MOR和MOE与户外老化3和6个月后的性能高度相关。

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