ASTM D1101- 97a (2006) Standard Test Methods for Integrity of Adhesive Joints in Structural Laminated Wood Products for Exterior Use
The test is suitable for check testing properly selected samples from regular production or for determining the suitability of adhesives and bonding techniques for the production of joints for exterior service. Vary the number of specimens taken from each member and the number of members selected for test depending on the total number of members involved and the purpose of the tests. It is advisable, however, to include at least three specimens in the test, with the specimens selected to represent the probable range of quality of the adhesive joints.
These test methods cover an accelerated means of
measuring the resistance to delamination of struetural laminated wood members intended for exterior service.
These test methods are not intended as substitutes or
replacements for the more severe test of resistance to delamination in Specification D2559.
Two test methods are included. Choice of test method
depends on purpose of the test and available time to complete.
Test Method A: This test requires 3 days to complete
and is a method for determining the suitability of adhesives and
manufacturing techniques and equipment for production of
joints adequate for exterior service.
Test Method B:This test requires approximately 122
h. (If excessive delamination occurs, the cycle is repeateD). It
is a quality-control type test for examining adhesive joint
Referenced Documents: ASTM Standards:
D907 TEerminology of Adheives
D2559 Specification for Adhesives for Bonded Structural
Wood Products for Use Under Exterior Exposure Conditions
ANSI A190.1-2012 American Nation Standard for Wood
ProductsStructural Glued Laminated Timber
By laminating a number of smaller pieces of lumber, a single large, strong, structural member is manufactured from smaller pieces. These structural members are used as vertical columns, horizontal beams, and arches. Glulams are readily produced in curved shapes and is available in a range of species and appearances. Connections are usually made with bolts or steel dowels and steel plates.
Glulam optimizes the structural values of wood. Because of their composition, large glulam members can be manufactured from a variety of smaller trees harvested from second-growth forests and plantations. Glulam provides the strength and versatility of large wood members without relying on the oldgrowth-dependent, solid-sawn timbers. As with other engineered wood products, it reduces the overall amount of wood used when compared to solid-sawn timbers by diminishing the negative impact of knots and other small defects in each component board.
Glulam has much lower embodied energy than reinforced concrete and steel, although it entails more embodied energy than solid timber. However, the laminating process allows the timber to be used for much longer spans, heavier loads, and more complex shapes than reinforced concrete or steel. Glulam is one tenth the weight of steel and one sixth the weight of concrete; the embodied energy to produce it is one sixth of that for a comparable strength of steel. Glulam can be manufactured to a variety of shapes, so it offers architects artistic freedom without sacrificing structural requirements.