You are here: Home
/ Publication Information
Title: A new method of determining moisture gradient in wood
Author: Cai, Zhiyong
Source: Forest products journal. Vol. 58, nos. 7/8 (July/Aug. 2008): pages 41-45.
Publication Series: Not categorized
Description: 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
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
XML: View XML
Cai, Zhiyong 2008. A new method of determining moisture gradient in wood. Forest Products Journal. 58(7/8): 41-45.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility