Tiago Hendrigo de Almeida, F. Icimoto, Diego Henrique Almeida, V. Aquino, A. Christoforo, F. Lahr
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引用次数: 0
摘要
木材的尺寸稳定性可以根据ABNT NBR 7190 (associa o Brasileira de Normas t cnicas [ABNT], 1997),通过测量0%和FSP含水率之间的总膨胀率来确定。由含水率变化引起的木材尺寸变化必须影响结构元件和与木结构的连接。根据巴西木材样品饱和规范,木材膨胀过程可能需要一个多月的时间,但使用高压灭菌器设备可能会加速这一活动,使尺寸稳定性的测定更容易。本文旨在研究使用高压灭菌器装置加速木材膨胀活性的可能性,考虑到巴西十三种商业木材的巴西代码。对比加速过程(第4阶段- 225分钟,压力为0.49 MPa)和木材膨胀的常规过程,p值为0.0730,组间平均差异约为1.1307%(95%置信水平为-0.0541至2.3156)。结果表明,与常规方法相比,在0.49 MPa压力下225分钟可获得等效的木材膨胀,可根据ABNT NBR 7190 (ABNT, 1997)更快地进行木材尺寸稳定性评估。
Accelerated swelling of wood for rapid dimensional stability
Dimensional stability of wood can be determined by measuring the total swelling percentage between 0% and FSP moisture content according to the ABNT NBR 7190 (Associação Brasileira de Normas Técnicas [ABNT], 1997). Wood dimensional variation by the moisture content modifications must influence both structural elements and connections into timber structures. The wood swelling procedure according to the Brazilian code for saturation of wood samples can take more than a month, but the use of autoclave devices may accelerate this activity, making easier the dimensional stability determination. This paper aims to investigate the possibility of accelerating the wood swelling activity using an autoclave device, considering the Brazilian code for thirteen Brazilian commercial wood species. Contrast test for comparison between accelerated process (Stage 4 – 225 min. at 0.49 MPa pressure) and the conventional procedure for wood swelling resulted in p-value equal to 0.0730 and the average difference between groups about 1.1307% (varying between -0.0541 and 2.3156 with 95% confidence level). According to results, 225 min. at 0.49 MPa pressure provides an equivalent wood swelling compared to the conventional procedure, which can make faster the wood dimensional stability evaluation according to the ABNT NBR 7190 (ABNT, 1997).
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