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33 records – page 1 of 4.

Assessment of heat-treated jack pine and balsam fir

https://library.fpinnovations.ca/en/permalink/fpipub5324
Author
Lihra, T.
Date
May 2003
Edition
42198
Material Type
Research report
Field
Sustainable Construction
durability should be observed. However, some mechanical properties of the wood may have decreased
Author
Lihra, T.
Contributor
Canada. Canadian Forest Service
Date
May 2003
Edition
42198
Material Type
Research report
Physical Description
17 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Treatment
Mechanical properties
Heat
Series Number
CFS Value-Added Report 3675
Location
Sainte-Foy, Québec
Language
English
Abstract
Industrial heat treatment technology for wood has been under development since the 1970s. The technology consists in heating wood to temperatures of from 150°C to 240°C while preventing it from burning. This is achieved by heating the wood in either an inert atmosphere or saturated vapour environment. Heating the wood over 200°C changes the chemical structure of the wood and results in a reduction in its hydrophilic behaviour. After heat treatment when wood colour has changed to brown, an improvement in dimensional stability and biological durability should be observed. However, some mechanical properties of the wood may have decreased. This enhanced dimensional stability and biological durability make heat treatment an interesting option for the protection of wood used in exterior applications. The objectives of this study are to assess the performance of heat treatment technologies and to determine the properties of jack pine and balsam fir after heat treatment, as regards to exterior applications. Owing to difficulties in the start-up period that significantly delayed the project, no experimental work had been conducted by the end of March 2003. The lumber has however been sent to two companies for treatment and the physical and mechanical tests will be conducted under a new project entitled “Quality Control and Certification of Thermally Modified Wood.” A final report will be issued at the end of March 2004.
Heat treatment, Effect on mechanical properties
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Basic wood properties of second-growth sitka spruce

https://library.fpinnovations.ca/en/permalink/fpipub5534
Author
Jozsa, Les A.
von Schilling, B.
Sen, P.
Date
January 1993
Edition
37459
Material Type
Research report
Field
Sustainable Construction
Author
Jozsa, Les A.
von Schilling, B.
Sen, P.
Contributor
British Columbia. Ministry of Forests. Queen Charlotte Forest District.
Date
January 1993
Edition
37459
Material Type
Research report
Physical Description
38 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Second growth
Picea
Physical properties
Mechanical properties
Growth
Series Number
W-1446
Location
Vancouver, British Columbia
Language
English
Abstract
The basic wood properties of 45-year-old second-growth sitka spruce were examined to determine if rapid growth produces poor wood quality. Five dominant and codominant trees were sampled from each of four stands with stocking densities of 520, 640, 1080, and 1520 stems/ha. Stem size, extent of live crown, yearly wood relative density trends, and longitudinal shrinkage were measured.
Picea sitchensis - Mechanical properties
Picea sitchensis - Physical properties
Second growth
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Behaviour of waferboard floor sheating under concentrated and impact loads

https://library.fpinnovations.ca/en/permalink/fpipub2338
Author
Szabo, T.
Date
June 1981
Edition
38900
Material Type
Research report
Field
Sustainable Construction
Author
Szabo, T.
Date
June 1981
Edition
38900
Material Type
Research report
Physical Description
15 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Mechanical properties
Series Number
CFS/DSS project no 10/80-81
DSS o5ss KL 229-0-4143
Location
Ottawa, Ontario
Language
English
Abstract
Floors - Strength - Impact
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Critical times, moisture contents and temperatures for detectable strength loss in plywood and oriented strand board : pilot study|IN: Limiting conditions for decay : compilation of reports.

https://library.fpinnovations.ca/en/permalink/fpipub41215
Author
Clark, Jean E.
Morris, Paul I.
Lum, Conroy
Date
April 2000
Material Type
Research report
Field
Sustainable Construction
Author
Clark, Jean E.
Morris, Paul I.
Lum, Conroy
Contributor
Canada. Canadian Forest Service.
Date
April 2000
Material Type
Research report
Physical Description
11 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Mechanical properties
Strandboards
Physical properties
Plywood
Oriented strandboard
Orientation
Series Number
IN Canadian Forest Service No. 16;1963
W-1674
Location
Vancouver, British Columbia
Language
English
Abstract
The project objective is to identify the wood-rotting fungi causing decay in Canadian buildings, and to provide data for a numerical model which will provide an indication of the time required for initiation of strength loss in wood-based panels when exposed to a range of moisture contents and temperatures. The MEWS consortium led by the National Research Council's Institute for Research in Construction is developing a computer model to predict the moisture and temperature conditions within a construction assembly in service. By including a damage function calculation for the various building components, the model can predict the consequences of these conditions in terms of strength loss. Forintek's role is to develop an experimental protocol that will be universally acceptable in the field of wood science, and generate a data set from which one could derive a damage equation for wood decay as a function of time, temperature and moisture conditions. Discussions have established that strength loss in sheathing is the first priority. A series of proposed test methods were examined. In consultation with members of the consortium task force, a method was selected which was felt would provide suitable strength loss data within the constraints of the funding available. Sheathing samples will be subjected to various combinations of temperature and humidity and repeatedly inoculating with a wood-rotting fungus to represent natural infection. The samples will be monitored using non-destructive testing and then destructively tested when the first test suggests a strength change. The result is a two-stage test at a range of temperatures and humidity levels, giving a measurement of time to strength loss. An initial pilot study is concerned with development, refining and verification of the method. "Method B" of ASTM 3043 is being evaluated to determine if it will be appropriate. The test is monitoring the bending stiffness and strength of oriented strand board samples, using a 2-point flexure test. The pilot study is underway, with samples exposed to 20°C and a relative humidity of approximately 96%. Problems involving moisture control in the environmental chambers have been resolved, as have questions around the sample size, the number of test specimens required in the pilot study, the time required for conditioning prior to inoculation and the actual bending and strength test procedures. The inoculation protocol is being evaluated. At this time none of the test pieces have shown significant losses in bending stiffness. A number of test conditions remain to be defined, however, and these will be established at the conclusion of the pilot study.
Plywood - Strength
Oriented strandboard - Strength
Strength - Influence of moisture content
Strength - Influence of temperature
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Critical times, moisture contents and temperatures for detectable strength loss in plywood and oriented strand board : planning and proposed work|IN: Limiting conditions for decay : compilation of reports.

https://library.fpinnovations.ca/en/permalink/fpipub41214
Author
Clark, Jean E.
Morris, Paul I.
O'Connor, J.
Lum, Conroy
Date
April 2000
Material Type
Research report
Field
Sustainable Construction
Author
Clark, Jean E.
Morris, Paul I.
O'Connor, J.
Lum, Conroy
Contributor
Canada. Canadian Forest Service.
Date
April 2000
Material Type
Research report
Physical Description
10 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Mechanical properties
Strandboards
Physical properties
Plywood
Oriented strandboard
Orientation
Series Number
IN Canadian Forest Service No. 16;1963
W-1673
Location
Vancouver, British Columbia
Language
English
Abstract
The project objective is to identify the wood-rotting fungi causing decay in Canadian buildings, and to provide data for a numerical model which will provide an indication of the time required for initiation of strength loss in wood-based panels when exposed to a range of moisture contents and temperatures. The MEWS consortium led by the National Research Council's Institute for Research in Construction is developing a computer model to predict the moisture and temperature conditions within a construction assembly in service. By including a damage function calculation for the various building components, the model can predict the consequences of these conditions in terms of strength loss. We do not have strength data on North American wood species exposed to decay fungi under limiting conditions (20-30%). There is also no standard protocol for assessing strength loss due to decay in non-ideal conditions. Forintek's role is to develop an experimental protocol that will be universally acceptable in the field of wood science, and generate a data set from which one could derive a damage equation for wood decay as a function of time, temperature and moisture conditions. Discussions have established that strength loss in sheathing is the first priority. A series of proposed test methods were examined. In consultation with members of the consortium task force, a method was selected which was felt would provide suitable strength loss data within the constraints of the funding available.
Plywood - Strength
Oriented strandboard - Strength
Strength - Influence of moisture content
Strength - Influence of temperature
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Current applicability of standing timber volumes and wood density for Canadian species in ASTM Standard D2555 on establishing clear wood strength values

https://library.fpinnovations.ca/en/permalink/fpipub37233
Author
Gonzalez, J.S.
Stieda, C.K.A.
Date
March 1991
Material Type
Research report
Field
Sustainable Construction
Author
Gonzalez, J.S.
Stieda, C.K.A.
Date
March 1991
Material Type
Research report
Physical Description
18 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Mechanical properties
Series Number
Forestry Canada No. 11;5410K024
W-839
Location
Vancouver, British Columbia
Language
English
Abstract
Pith-to-bark increment cores were obtained at breast height from 199 interior Douglas-fir parent trees located in the east Kootenay region of British Columbia. The cores were divided into equal lengths and were analyzed separately for wood density. The half portion close to the pith (inner half) was used to estimate the juvenile wood density; the outer half was used to estimate the wood density of the mature volume of the tree. The outer half was significantly higher in wood density than the inner half. When compared to other parent trees of the same species located in other interior seed zones, the outer half of these east Kootenay trees had significantly lower wood density.
Density
Strength
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Development of performance criteria for residential floors under concentrated loads at the Mark XI project

https://library.fpinnovations.ca/en/permalink/fpipub38006
Author
Onysko, D.M.
Date
March 1982
Material Type
Research report
Field
Sustainable Construction
Author
Onysko, D.M.
Date
March 1982
Material Type
Research report
Physical Description
72 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Testing
Mechanical properties
Research
Materials tests
Materials
Joists
Building materials
Series Number
CFS/DSS project no 7/81-82
E-35
Location
Ottawa, Ontario
Language
English
Abstract
HUDAC Mark XI Research House
Floors - Testing
Joists - Strength
Building materials - Testing
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Développement d'applications pour le bois modifié thermiquement

https://library.fpinnovations.ca/en/permalink/fpipub39100
Author
Tremblay, Carl
Date
March 2008
Material Type
Research report
Field
Sustainable Construction
Author
Tremblay, Carl
Date
March 2008
Material Type
Research report
Physical Description
27 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Thermodynamics
Physical properties
Mechanical properties
Series Number
General Revenue Report Project No. 5798
5798
Location
Québec, Québec
Language
French
Abstract
Ce rapport d’étape présente les principaux résultats obtenus dans le cadre d’un projet réalisé en collaboration avec le Laboratoire des Technologies de l’Énergie de Hydro-Québec. Au cours de la première année de ce projet, les propriétés mécaniques et physiques du bois de tremble modifié thermiquement à trois niveaux de température ont été déterminées en respectant les classes de traitement établies par la Finnish ThermoWood Association. Des travaux ont aussi été réalisés en étroite collaboration avec l’industrie afin d’évaluer le potentiel d’utilisation d’essences variées de bois feuillus modifiés thermiquement pour des applications telles que des composants d’instruments de musique, lames de plancher, armoires de cuisine et autres produits d’apparence pour usage intérieur. Ces travaux se poursuivront au cours de la prochaine année. Des essais additionnels permettront aussi d’étudier davantage l’impact des programmes de traitement, plus précisément l’effet du délai à la température maximale sur la couleur et les propriétés du bois. Finalement, le LTE poursuivra ses études portant sur l’efficacité énergétique du procédé de modification thermique.
Mechanical properties
Physical properties
Thermodynamics
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Effects of basidiomycetes isolated from utility poles on wood strength and biomass

https://library.fpinnovations.ca/en/permalink/fpipub5919
Author
McAfee, B.J.
Dawson-Andoh, B.
Lovell, R.
Rossignol, L.
Date
June 1994
Edition
41662
Material Type
Research report
Field
Sustainable Construction
Author
McAfee, B.J.
Dawson-Andoh, B.
Lovell, R.
Rossignol, L.
Date
June 1994
Edition
41662
Material Type
Research report
Physical Description
18 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Wood
Utility poles
Mechanical properties
Poles
Biomass
Series Number
Canadian Forest Service No. 21a
E-2231
Location
Ottawa, Ontario
Language
English
Abstract
Basidiomycetes
Utility Poles
Wood Strength
Biomass
Documents
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Fundamental properties of black cottonwood and balsam poplar in British Columbia and Alberta

https://library.fpinnovations.ca/en/permalink/fpipub37035
Author
Kellogg, R.M.
Swan, E.P.
Date
April 1984
Material Type
Research report
Field
Sustainable Construction
Author
Kellogg, R.M.
Swan, E.P.
Date
April 1984
Material Type
Research report
Physical Description
1 v.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Populus
Physical properties
Mechanical properties
Balsam
Aspen
Series Number
CFS Contract 02-80-56-008
W-243
Location
Vancouver, British Columbia
Language
English
Abstract
Populus balsamifera - Mechanical properties
Populus trichocarpa - Mechanical properties
Populus balsamifera - Physical properties
Populus trichocarpa - Physical properties
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33 records – page 1 of 4.