The effect of cyclic relative humidity changes on moisture content and thickness swelling behavior of oriented strandboard

Laura Moya, William T.Y. Tze, Jerrold E. Winandy

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

This study examines the effect of cyclic RH exposure on MC and thickness swelling (TS) of oriented strandboard (OSB) made from fire-impacted trees. Two specimens were cut from the center of each OSB panel and one was edge-sealed. After being conditioned to 65% RH, specimens were placed in a climate-controlled chamber and subjected to three cyclic changes of 90-30% RH at 20°C. Experimental data were characterized by three time-dependent MC or TS models: logarithmic, power law, and exponential. The latter two models gave the best fits showing that edge-sealing reduced the extent of swelling during adsorption and reduced the moisture loss at desorption. The models also described the effect of burnt level and bark throughout the humidity exposure cycles. The exponential model revealed no significant effect of burnt level on the panel TS. Both the power law and exponential models indicated that addition of charred bark to the panels significantly decreased the maximum amount of moisture and thickness change. The exponential model revealed an increase in equilibrium TS at the end of each RH cycle compared with the end of precyclic desorption. True nonrecoverable TS was difficult to discern in Cycle 1 because of moisture hysteresis, but the nonrecoverable effect was evident in Cycles 2 and 3.

Original languageEnglish (US)
Pages (from-to)447-460
Number of pages14
JournalWood and Fiber Science
Volume41
Issue number4
StatePublished - Oct 29 2009

Keywords

  • Cyclic humidity exposure
  • Fire-impacted wood
  • Oriented strandboard
  • Thickness swelling modeling

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