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Increasing adhesive choices in engineered wood products that meet market requirements

https://library.fpinnovations.ca/en/permalink/fpipub41381
Author
Pirvu, Ciprian
Date
March 1907
Material Type
Research report
Field
Sustainable Construction
Author
Pirvu, Ciprian
Contributor
Alberta Forestry Research Institute
Date
March 1907
Material Type
Research report
Sector
Wood Products
Field
Sustainable Construction
Research Area
Building Systems
Subject
Materials
Adhesives
Series Number
W-2481
Location
Vancouver, British Columbia
Language
English
Abstract
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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State-of-the-art report on fibre reinforced polymer (FRP) utilization in wood products

https://library.fpinnovations.ca/en/permalink/fpipub41302
Author
Pirvu, Ciprian
Date
June 2004
Material Type
Research report
Field
Sustainable Construction
Author
Pirvu, Ciprian
Date
June 2004
Material Type
Research report
Physical Description
35 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Materials
Series Number
W-2073
Location
Vancouver, British Columbia
Language
English
Abstract
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
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