A CORRELATION BETWEEN THE GAS AND LIQUID PERMEABILITIES OF BEECH WOOD HEAT-TREATED IN HOT WATER AND STEAM MEDIUMS

Hamid Reza Taghiyari, Aisona Talaei, Ali Karimi

Abstract


Heat-treatment, a major method of wood modification for improving dimensional stability and naturaldurability, has been studied considerably in the scientific literature. This study will focus on the effectof heat-treatment on permeability, an important physical property of wood by subjecting beech samplesto two different mediums of hot water and steam, as well as in two buffered hot water of pH 7 and 8.Hydrothermal treatment caused gas permeability to decrease to its lowest value among the treatments(91.6% decrease comparing the control treatment). Hydrothermal treatment in buffered hot water of pH8 made the lowest impact on gas permeability (12.3% decrease). The decrease in gas permeability wasdue to settlement of extractives on vessel perforation plates. Gas permeability showed a highly significantcorrelation with the amount of swelling in radial direction. Low correlation was found between liquidpermeability with water absorption and the amount of swelling. Gas permeability is considered a suitablecriterion for predicting the amount of swelling in beech wood.

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