Microcrack propagation in red and black heartwoods of Cryptomeria japonica during drying

Hiroki Sakagami, Fumiko Hatae, Hiroyuki Yamamoto, Yoshio Kijidani, Junji Matsumura

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Microcrack behaviors in black and red heartwoods of Cryptomeria japonica were compared in this study. Black and red heartwoods have extremely different green moisture contents but similar wood structure. Small heartwood samples were prepared from these two types of green wood. Moisture contents of black and red heartwood were 201.5% and 51.3%, respectively. The samples were dried at 50 °C in a controlled-environment chamber with a relative humidity below 5%. The propagation of microcracks was continuously observed using a confocal laser scanning microscope while the samples dried. The electrical resistivity of the surface was also measured to assess surface moisture content. Results showed that the transformation of the microcracks was similar between black and red heartwoods. However, the appearance of microcracks in the black heartwood was delayed, whereas the microcracks appeared in red heartwood immediately after drying. These suggested that in-situ observation is essential for distinguishing when microcracks emerged. It was also suggested the green moisture content of heartwood has a major effect on the occurrence of microcracks. Drying conditions must be adjusted to account for the moisture content of green heartwood, even for specimens of the same species that have the same anatomical structure.

Original languageEnglish
Pages (from-to)5983-5994
Number of pages12
JournalBioResources
Volume8
Issue number4
DOIs
Publication statusPublished - Jan 1 2013

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microcrack
Microcracks
Drying
moisture content
Moisture
Wood
drying
relative humidity
electrical resistivity
Atmospheric humidity
Microscopes
laser
Scanning
Lasers

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Bioengineering
  • Waste Management and Disposal

Cite this

Microcrack propagation in red and black heartwoods of Cryptomeria japonica during drying. / Sakagami, Hiroki; Hatae, Fumiko; Yamamoto, Hiroyuki; Kijidani, Yoshio; Matsumura, Junji.

In: BioResources, Vol. 8, No. 4, 01.01.2013, p. 5983-5994.

Research output: Contribution to journalArticle

Sakagami, Hiroki ; Hatae, Fumiko ; Yamamoto, Hiroyuki ; Kijidani, Yoshio ; Matsumura, Junji. / Microcrack propagation in red and black heartwoods of Cryptomeria japonica during drying. In: BioResources. 2013 ; Vol. 8, No. 4. pp. 5983-5994.
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