Swelling properties of bark

✍ Scribed by J. Raczkowski

• Book ID: 104734643
• Publisher: Springer
• Year: 1979
• Tongue: English
• Weight: 583 KB
• Volume: 13
• Category: Article
• ISSN: 0043-7719
• DOI: 10.1007/bf00350223

✦ Synopsis

Swelling pressure of outer bark (rhytidome) of pine, larch, poplar, wiUow, oak, birch and black locust was investigated. Swelling pressure was determined on oven-dry samples moistened in water, using an accelerated method consisting of initial evacuation of air from the samples. Additionally, free swelling of bark, water-absorption capacity, and stress at proportional limit in compression of wet bark were investigated. Swelling pressure of bark ranges from 0.11 to 0.87 MPa, depending on the species and anatomical direction. These figures are 4 to 71% of respective values for the swelling pressure of wood of the same species. Swelling pressure of bark amounts to 11-71% of stresses at proportional limit when bark is subjected to compression in the wet state. With increasing bark density, a clear tendency was observed for an increase in swelling pressure and stress at proportional limit, as well as a decrease in water-absorption capacity.