Aging Effect on Hygroscopisity of Wood By Using Aged Hinoki Wood from Japanese Historical Buildings

Abstract

The hygroscopicity of various aged hinoki wood building elements (Chamaecyparis obtusa) was evaluated from their isotherms. The data showed that the moisture content of new wood was higher than that of aged wood when equilibrated at the same humidity. By applying the Hailwood-Horrobin adsorption equations to the data for aged wood, we determined that the number of sorption sites per unit volume at low humidity decreased and that the aggregation of water at high humidity decreased.