Modelling the Moisture Induced Risk of Decay for Treated and Untreated Wood Above Ground
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A. O. Rapp
Summary
During two years of natural weathering the course of the moisture content of test samples of pine sapwood (Pinus sylvestris L.), Norway spruce (Picea abies L.), oak heartwood (Quercus robur L.) and Douglas fir heartwood (Pseudotsuga menziesii Franco.) was recorded by means of 12,000 individual gravimetric readings. The samples were untreated, treated with a weather protection varnish, or impregnated with melamine resin. The data were evaluated with regard to the number of days per year on which the moisture content of wood exceeded the limit of 25%. From the results of subsequent laboratory investigations into the adsorption of liquid water and moisture vapour desorption using the same test material, it was possible to work out a mathematical relationship (MRI = moisture induced risk index) which correlates closely with the number of days of more than 25% moisture content during the second year of natural weathering. The MRI is proposed as a parameter for the assessment of the protective effect of wood treatments which are intended to reduce moisture content and also for durability prediction of untreated wood in out of ground contact situations.
Copyright © 2000 by Walter de Gruyter GmbH & Co. KG
Articles in the same Issue
- Modelling the Moisture Induced Risk of Decay for Treated and Untreated Wood Above Ground
- FTIR Characterization of Copper Ethanolamine—Wood Interaction for Wood Preservation
- Glycerol/Glyoxal: A New Boron Fixation System for Wood Preservation and Dimensional Stabilization
- Removal of Phenolic Hydroxyl Groups in Lignin Model Compounds and Its Effect on Photostability
- Cation Exchange Capacity Tests on Some Lignocellulosic Materials Highlight Some Aspects of the Use of Copper as Wood Preservative
- Biological, Chemical and Mechanical Characteristics of "Wulstholz" as a Response to Mechanical Stress in Living Trees of Picea abies [L.] Karst
- A Comparative Study on Reactions of Hydrogen Peroxide and Peracetic Acid with Lignin Chromophores. Part 1. The Reaction of Coniferaldehyde Model Compounds
- A Comparative Study on Reactions of Hydrogen Peroxide and Peracetic Acid with Lignin Chromophores. Part 2. The Reaction of Stilbene-Type Model Compounds
- Chlorinated Phenolic Compounds in Bleaching Filtrates from a Mixed Eucalyptus and Acacia Pulp Using Different Sequences
- Kinetic Studies on Oxidation of Veratryl Alcohol by Laccase-Mediator System. Part 1. Effects of Mediator Concentration
- Kinetic Studies on Oxidation of Veratryl Alcohol by Laccase-Mediator System. Part 2. The Kinetics of Dioxygen Uptake
- Determination of Residual Stresses in Medium Density Fibreboard
- Dynamics of Hardwood Impregnation
- Study of the System Wood – Coating Material. I. Wood – Liquid Coating Material
- Effect of Lignocellulosic Materials on the Properties of Thermoplastic Polymer/Wood Composites
- A New Air Dehydration Process for Wood Dryers. Part I. Kinetic and Quality of Drying
- A New Air Dehydration Process for Wood Dryers. Part II. Elimination of Organic Compounds
- A New Method of Sample Preparation for Kenaf Bast Fiber Length Analysis with Automated Fiber Length Analyzer
- Literature Reports
Articles in the same Issue
- Modelling the Moisture Induced Risk of Decay for Treated and Untreated Wood Above Ground
- FTIR Characterization of Copper Ethanolamine—Wood Interaction for Wood Preservation
- Glycerol/Glyoxal: A New Boron Fixation System for Wood Preservation and Dimensional Stabilization
- Removal of Phenolic Hydroxyl Groups in Lignin Model Compounds and Its Effect on Photostability
- Cation Exchange Capacity Tests on Some Lignocellulosic Materials Highlight Some Aspects of the Use of Copper as Wood Preservative
- Biological, Chemical and Mechanical Characteristics of "Wulstholz" as a Response to Mechanical Stress in Living Trees of Picea abies [L.] Karst
- A Comparative Study on Reactions of Hydrogen Peroxide and Peracetic Acid with Lignin Chromophores. Part 1. The Reaction of Coniferaldehyde Model Compounds
- A Comparative Study on Reactions of Hydrogen Peroxide and Peracetic Acid with Lignin Chromophores. Part 2. The Reaction of Stilbene-Type Model Compounds
- Chlorinated Phenolic Compounds in Bleaching Filtrates from a Mixed Eucalyptus and Acacia Pulp Using Different Sequences
- Kinetic Studies on Oxidation of Veratryl Alcohol by Laccase-Mediator System. Part 1. Effects of Mediator Concentration
- Kinetic Studies on Oxidation of Veratryl Alcohol by Laccase-Mediator System. Part 2. The Kinetics of Dioxygen Uptake
- Determination of Residual Stresses in Medium Density Fibreboard
- Dynamics of Hardwood Impregnation
- Study of the System Wood – Coating Material. I. Wood – Liquid Coating Material
- Effect of Lignocellulosic Materials on the Properties of Thermoplastic Polymer/Wood Composites
- A New Air Dehydration Process for Wood Dryers. Part I. Kinetic and Quality of Drying
- A New Air Dehydration Process for Wood Dryers. Part II. Elimination of Organic Compounds
- A New Method of Sample Preparation for Kenaf Bast Fiber Length Analysis with Automated Fiber Length Analyzer
- Literature Reports
