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Increasing adhesive choices in engineered wood products that meet market requirements

https://library.fpinnovations.ca/fr/permalink/fpipub41381
Auteur
Pirvu, Ciprian
Date
March 1907
Genre du document
Research report
Domaine
Sustainable Construction
Auteur
Pirvu, Ciprian
Collaborateur
Alberta Forestry Research Institute
Date
March 1907
Genre du document
Research report
Secteur
Wood Products
Domaine
Sustainable Construction
Champ de recherche
Building Systems
Sujet
Materials
Adhesives
Série
W-2481
Localisation
Vancouver, British Columbia
Langue
English
Résumé
Test results for three representative adhesives were obtained for use in the development of a proposed standard for limited moisture exposure (CSA O112.10). The adhesives tested were an emulsion polymer isocyanate (EPI), a polyurethane (PUR) and a melamine-urea formaldehyde with 40% melamine resin content (MUF40). Currently, EPI and PUR are used for I-joists and fingerjoined lumber. MUF40 was included in the study as a non-conforming adhesive. The range of performance of these adhesives, along with that of melamine formaldehyde (MF) and polyvinyl acetate (PVA) evaluated in a previous study, is baseline information used in defining acceptable performance levels for adhesives undergoing block shear tests required in the proposed standard. Specimens in this study were evaluated under five test conditions: dry, vacuum-pressure wet or re-dried, and three-cycle boil-dry-freeze wet or re-dried. Dry and re-dried test conditions are the proposed test protocols for the draft CSA O112.10 standard. In terms of shear strength and percentage of wood failure, EPI and MUF40 met the requirements of CSA O112.9 for the dry test condition, and PUR did not. The following block shear test requirements are recommended for CSA O112.10, based on the 95% lower confidence limit of the EPI test results, and structured to be analogous to the requirements of CSA O112.9:
Median dry shear strength = 10 MPa (1450 psi) (adopted from CSA O112.9);
Vacuum-pressure re-dried median shear strength = 7.4 MPa (1070 psi);
Three-cycle boil-dry-freeze re-dried median shear strength = 4.4 MPa (640 psi);
Median percentage wood failure = 85% for all the proposed tests (adopted from CSA O112.9); and
Lower quartile percentage wood failure = 75% for all the proposed tests (adopted from CSA O112.9). The above requirements will be discussed in the CSA Task Group, which will eventually make recommendations to the CSA Standards Committee.
Adhesion and Adhesives - Composite Materials
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Moins de détails

State-of-the-art report on fibre reinforced polymer (FRP) utilization in wood products

https://library.fpinnovations.ca/fr/permalink/fpipub41302
Auteur
Pirvu, Ciprian
Date
June 2004
Genre du document
Research report
Domaine
Sustainable Construction
Auteur
Pirvu, Ciprian
Date
June 2004
Genre du document
Research report
Description physique
35 p.
Secteur
Wood Products
Domaine
Sustainable Construction
Champ de recherche
Advanced Wood Materials
Sujet
Materials
Série
W-2073
Localisation
Vancouver, British Columbia
Langue
English
Résumé
Fibre-reinforced wood systems are light, strong, stiff composites that can efficiently replace larger wood members and can be relied on to provide consistent mechanical properties. This report is an introduction to fibre-reinforced wood systems for members of the Canadian wood products industry. It provides the motivation for reinforcing wood with synthetic fibres, and surveys the choice of materials and their uses. Numerous examples of current applications are discussed to demonstrate the strong and weak points of various approaches and examine the durability and management of fibre-reinforced wood products, as well as to indicate opportunities that exist for the Canadian wood products industry. This report is intended to be a useful reference for the Canadian wood products industry, and assist future developments in structural and non-structural applications of fibre-reinforced wood products.
Composite materials - Durability
Fibres
Board products - Materials used
Documents
Moins de détails

NSERC innovation : hybrid structural wood composites for non-residential construction

https://library.fpinnovations.ca/fr/permalink/fpipub41325
Auteur
Pirvu, Ciprian
Date
March 2005
Genre du document
Research report
Domaine
Sustainable Construction
Auteur
Pirvu, Ciprian
Collaborateur
Natural Sciences Engineering Research Council
Date
March 2005
Genre du document
Research report
Description physique
10 p.
Secteur
Wood Products
Domaine
Sustainable Construction
Champ de recherche
Building Systems
Sujet
Mechanical properties
Research
Physical properties
Materials
Série
W-2197
Localisation
Vancouver, British Columbia
Langue
English
Résumé
In recent years, significant attention has been paid to the engineering performance of wood structural systems, and a new generation of more reliable engineered wood components for building construction has evolved. The latest trend is towards advanced products that combine wood and synthetics. This increases performance and structural reliability of engineered wood products, and leads to new markets and expanded opportunities. It is anticipated that cost of fibre reinforcement decreases over time and advances developed on reinforcing techniques and methods of evaluation would provide wood producers with more options to better position their products in the marketplace. A new reinforcing technique has been developed and applied to manufacture a hybrid wood product for structural applications. The technique involves a layering analogy using layers of synthetic reinforcement sandwiched between layers of wood composite. The products manufactured in the laboratory used regular OSB laminations and alternating layers of E-glass fabrics and resin. Three- and four-ply billets were manufactured with various layouts and then tests were conducted to characterize mechanical properties of the hybrid products. Overall, the test specimens performed well relative to the controls. Shear failures were observed as a result of the limited performance of OSB in shear, and consequently the next tests will be conducted with plywood laminations instead of OSB. Selected issues related to code acceptance of structural FRP-reinforced wood products are discussed in the appendix. Future work is suggested to completely characterize and understand the properties and behaviour of the FRP-reinforced wood products, including fire performance, long term durability, maintenance and cost, in order to establish an environment in which to work comfortably with such materials. Overcoming these issues is vital for product acceptance in building codes.
Composite materials - Physical properties
Composite materials - Research
Composite materials - Strength
Documents
Moins de détails

Structural performance of wood diaphragms with thick panels

https://library.fpinnovations.ca/fr/permalink/fpipub37788
Auteur
Pirvu, Ciprian
Date
March 2006
Genre du document
Research report
Domaine
Sustainable Construction
Auteur
Pirvu, Ciprian
Collaborateur
Canada. Canadian Forest Service.
Date
March 2006
Genre du document
Research report
Description physique
4 p.
Secteur
Wood Products
Domaine
Sustainable Construction
Champ de recherche
Building Systems
Sujet
Structural analysis
Design
Building construction
Analysis
Série
Canadian Forest Service No. 13
W-2275
Localisation
Vancouver, British Columbia
Langue
English
Résumé
This report describes work to provide research information suitable for implementing design procedures for diaphragms with thick sheathing in the Canadian Standard for Engineering Design in Wood (CAN/CSA O86.1) and to make the information available to other markets by publishing the results and recommended procedures in a journal article.
Structural analysis
Diaphragm analysis
Building construction - Design
Documents
Moins de détails

Opportunities for glued wood products. Final report

https://library.fpinnovations.ca/fr/permalink/fpipub41349
Auteur
Pirvu, Ciprian
Date
March 2006
Genre du document
Research report
Domaine
Sustainable Construction
Auteur
Pirvu, Ciprian
Collaborateur
Alberta Forestry Research Institute
Date
March 2006
Genre du document
Research report
Description physique
36 p.
Secteur
Wood Products
Domaine
Sustainable Construction
Champ de recherche
Building Systems
Sujet
Markets
Alberta
Série
W-2302
Localisation
Vancouver, British Columbia
Langue
English
Résumé
With recent pressures to extract more value from the Alberta wood resource, efforts are being made to find higher value products that can be marketed along with SPF lumber traditionally used in the construction industry. Products such as reinforced glulam, edge glued and face glued lumber, or overlaid laminated veneer lumber provide additional opportunities for the medium-size Alberta lumber producers who are challenged by fierce competition in a commodity-focused market. Given the steady increase in the utilization of glued products in structural applications, there is a strong potential for further expansion of these markets. A recently developed standard that allows products to be manufactured from face- and edge-gluing of components paves the way for the development of a wide range of products specifically designed for the construction market. A situational analysis of the current state of the Alberta forest industry is presented here. It includes resources, markets, codes and standards, technical and market challenges, and prospects for developing higher value structural wood products by gluing wood together or reinforcing wood with other materials.
AFRI-817G-06, 5063 pertaining to Composite products - Markets; Alberta - Economic conditions
Documents
Moins de détails

Structural performance of wood diaphragms with thick panels

https://library.fpinnovations.ca/fr/permalink/fpipub37821
Auteur
Pirvu, Ciprian
Date
March 2007
Genre du document
Research report
Domaine
Sustainable Construction
Auteur
Pirvu, Ciprian
Collaborateur
Canada. Canadian Forest Service.
Date
March 2007
Genre du document
Research report
Description physique
10 p.
Secteur
Wood Products
Domaine
Sustainable Construction
Champ de recherche
Building Systems
Sujet
Structural analysis
Design
Building construction
Analysis
Série
Canadian Forest Service No. 13;4636
W-2396
Localisation
Vancouver, British Columbia
Langue
English
Résumé
The objectives of this project are to provide research information suitable for implementing design procedures for diaphragms with thick sheathing in the Canadian Standard for Engineering Design in Wood (CAN/CSA O86.1) and to make the information available to other markets by publishing the results and recommended procedures in a journal article.
Structural analysis
Diaphragm analysis
Building construction - Design
Documents
Moins de détails

Development of standards for edge-glued and face-glued engineered products

https://library.fpinnovations.ca/fr/permalink/fpipub41365
Auteur
Pirvu, Ciprian
Date
March 2007
Genre du document
Research report
Domaine
Sustainable Construction
Auteur
Pirvu, Ciprian
Date
March 2007
Genre du document
Research report
Description physique
66 p.
Secteur
Wood Products
Domaine
Sustainable Construction
Champ de recherche
Building Systems
Sujet
Veneer
Mechanical properties
Specifications
Laminate product
Joints
Gluing
Specification
Série
Value to Wood No. FCC 58
W-2384
Localisation
Vancouver, British Columbia
Langue
English
Résumé
Forintek has completed a two-year investigation of the NLGA SPS 6 Standard, Special Products Standard for Structural Face-Glued Lumber. The NLGA SPS 6 Standard prescribes product specifications and qualification and quality control requirements for structural products created by edge-gluing and/or fingerjoining lumber segments. Under the NLGA SPS 6 Standard, the design values assigned are based on the visual grade and the stress level achieved in qualification tests on the glue joints. The project assessed the effect of the following three factors on strength of the NLGA SPS 6 product: 1. Tension proof-loading; 2. Relative location of fingerjoints in adjacent members when fingerjoined material is edge-glued; 3. Strength of the material used to make the NLGA SPS 6 product. Results showed a positive effect of proof-loading, a minor effect of staggering of fingerjoints, and a highly significant effect of density of raw material on tensile stress of edge-glued specimens. It was confirmed that SPS6 products of greater commercial value can be obtained from lower grade lumber. However, visual grading of SPS 6 products proved to be more difficult than visual grading of lumber, because grade-determining wood characteristics were sometimes hidden in the bond line, and could not be properly identified. The findings of this project can be used to fine tune the NLGA SPS 6 standard and the other NLGA fingerjoint and face-glued lumber product standards. The project will help the wood industry maximize the utilization of their raw material resource, resulting in increased profitability.
Structural timbers - Mechanical properties
Gluing - Specifications
Lumber - Gluing
Glued joints - Finger
Glued joints - Edge
Glued joints - Specifications
Lumber, Laminated veneer - Strength
Documents
Moins de détails

Structural performance of wood diaphragms with thick panels

https://library.fpinnovations.ca/fr/permalink/fpipub37881
Auteur
Pirvu, Ciprian
Date
March 2008
Genre du document
Research report
Domaine
Sustainable Construction
Auteur
Pirvu, Ciprian
Collaborateur
Canada. Canadian Forest Service.
Date
March 2008
Genre du document
Research report
Description physique
70 p.
Secteur
Wood Products
Domaine
Sustainable Construction
Champ de recherche
Building Systems
Sujet
Mechanical properties
Design
Building construction
Série
Canadian Forest Service No. 13
4636
W-2525
Localisation
Vancouver, British Columbia
Langue
English
Résumé
Wood design standards in Canada and the United States provide design values for floor and roof diaphragms with sheathing thickness ranging from 9.5 mm (3/8 in) up to 18.5 mm (3/4 in), that are supported by joists spaced less than 610 mm (24 in) on centre. This range of sheathing thicknesses is adequate for housing and small buildings, but for large non-residential structures, diaphragms with thicker sheathing and wider joist spacing may be more appropriate. This paper includes the findings of a study aimed at providing research information suitable for implementing design values for diaphragms with thick sheathing in the North American wood design standards. Results from quasi-static monotonic tests on fifteen full-scale 7.3 m (24 ft) long by 2.4 m (8 ft) wide diaphragms framed with 38x191 mm or 38x235 mm (nominal 2x8 and 2x10, respectively) solid sawn lumber or laminated strand lumber and sheathed with plywood or oriented strand board are discussed. A numerical model was developed using the finite element method. The basic properties of the sheathing, framing members and nailed connections were implemented in the model to replicate the structural behaviour of the diaphragms with thick panels. The numerical model was successfully validated against the experimental data. The shear resistance values for the diaphragms with thick panels tested in this study were calculated. The model may be used to interpolate between various diaphragm configurations and calculate shear resistance values for other configurations of diaphragms with thick sheathing. In the long run, it is hoped that the use of thicker sheathing will enable the use of structural systems that are cost effective for wider joist or beam spacing than systems made with dimension lumber and traditional sheathing thickness. The experimental data and the model developed in this project will be used to develop proposals for implementation of wood floor and roof diaphragms with thick panels in the Canadian and United States wood design standards.
Diaphragms - Strength
Building construction - Design
Documents
Moins de détails

Load duration test protocols for engineered wood products

https://library.fpinnovations.ca/fr/permalink/fpipub37951
Auteur
Pirvu, Ciprian
Date
March 2009
Genre du document
Research report
Domaine
Sustainable Construction
Auteur
Pirvu, Ciprian
Collaborateur
Canada. Canadian Forest Service.
Date
March 2009
Genre du document
Research report
Description physique
12 p.
Secteur
Wood Products
Domaine
Sustainable Construction
Champ de recherche
Building Systems
Sujet
Mechanical properties
Materials
Building construction
Série
Canadian Forest Service No. 4
W-2653
Localisation
Vancouver, British Columbia
Langue
English
Résumé
The objective of the project is to develop/improve practical, reliable and internationally recognized methods for assessing/pre-screening the long-term structural performance of engineered wood products used in residential and non-residential applications.
Building construction - Materials used - Strength
Documents
Moins de détails

Fabrication du bois lamellé-croisé (CLT)

https://library.fpinnovations.ca/fr/permalink/fpipub42935
Auteur
Wang, Brad J.
Pirvu, Ciprian
Lum, Conroy
Date
January 2011
Genre du document
Research report
Domaine
Sustainable Construction
lamellé collé. 3. Construction en bois d’ingénierie. I. Gagnon, Sylvain, 1970- . II. Pirvu, Ciprian, 1968
Auteur
Wang, Brad J.
Pirvu, Ciprian
Lum, Conroy
Date
January 2011
Genre du document
Research report
Description physique
70 p.
Secteur
Wood Products
Domaine
Sustainable Construction
Champ de recherche
Building Systems
Sujet
Timber
Laminate product
Building construction
Design
Langue
French
Résumé
Le présent chapitre fournit de l’information générale sur la fabrication du CLT qui peut être intéressante pour les concepteurs. Les renseignements contenus dans ce chapitre peuvent également servir de guide aux fabricants de CLT quant au développement de leur cahier de spécifications d'exploitation d'usine. Ce chapitre aborde également les étapes spécifiques du processus de fabrication de CLT et les variables de processus clés qui ont une incidence sur la qualité d’adhésion des lamelles des produits de CLT. On y retrouve également les méthodes proposées pour évaluer la qualité des panneaux.
Documents
Moins de détails

20 notices – page 1 of 2.