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Title: A new method of determining moisture gradient in wood

Source: Forest products journal. Vol. 58, nos. 7/8 (July/Aug. 2008): pages 41-45.

Author(s)Cai, Zhiyong

Publication Year: 2008  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4706-1A

Abstract: Moisture gradient in wood and wood composites is one of most important factors that affects both physical stability and mechanical performance. This paper describes a method for measuring moisture gradient in lumber and engineering wood composites as it varies across material thickness. This innovative method employs a collimated radiation beam (x rays or [gamma] rays) emitted from a radiation source that discretely scans the material in steps or continuously through its thickness direction. A radiation detector on the other side detects intensities of the transmitted beam, which directly relates to the material density profile through scanning direction. Moisture gradient can be calculated by contrasting it to the oven dried density profile. A series of solid wood samples were tested to verify the accuracy of this technique. The estimated moisture content (MC) gradients measured using the radiation method were compared with the actually measured MC gradients using the ovendry method of microtomed sections. The high correlation between the two MC gradient methods proved that the radiation method could provide an accurate and prompt estimation of internal wood MC gradient.

Keywords: Wood drying, drying, wood defects, defects, wood moisture, moisture, composite materials, X-rays, nondestructive testing, wood density, density, dimensional stability, moisture content, hygroscopicity

File size: 252 kb(s)

This publication is also viewable on Treesearch:  view
RITS Product ID: 26167
Current FPL Scientist associated with this product
Cai, Zhiyong
Supervisory Research Materials Engineer
  

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