NDLI: Outdoor exposure tests of structural laminated veneer lumber (II): evaluation of the strength properties after nine years

Content Provider	Springer Nature Link
Author	Hayashi, Tomoyuki Miyatake, Atsushi Fu, Feng Kato, Hideo Karube, Masahiko Harada, Masaki
Copyright Year	2005
Abstract	To investigate the durability of structural laminated veneer lumber (LVL), outdoor exposure tests have been conducted since 1990 at a field-testing site at the Forestry and Forest Products Research Institute. This article is the second interim report on the results after 9 years of exposure. Seven kinds of structural LVL with no preservative treatment were subjected to the tests. Almost all the exposed specimens were decayed by a kind of brown rot fungi (Pseudomerulius aureus (Fr.) Julich). The degree of decay varied with wood species; grand fir and western hemlock LVL in particular showed weak resistance against the decay. All the specimens were stored for more than 1 year in a testing room conditioned at 20°C and 65% relative humidity. We then measured the ultrasonic velocity of the specimens by the Pundit method, penetration depth by the Pilodyn method, and bending strength by a conventional bending test. Correlation between nondestructive measurement factors and the density was strong even on LVL with many adhesive layers. The nondestructive testing method was found to be applicable to LVL as well as solid lumber. After the nondestructive measurements, each LVL was cut into three types of specimen (top: T, middle: M, and bottom: B) for the bending tests. The bending strength varied with the type of specimens. Correlation between modulus of elasticity and modulus of rupture was strong even in the decayed specimens.
Starting Page	486
Ending Page	491
Page Count	6
File Format	PDF
ISSN	14350211
Journal	Journal of Wood Science
Volume Number	51
Issue Number	5
e-ISSN	16114663
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-10-25
Publisher Place	Tokyo
Access Restriction	Subscribed
Subject Keyword	Laminated veneer lumber Outdoor exposure test Durability Characterization and Evaluation Materials Ceramics, Glass, Composites, Natural Methods Wood Science & Technology
Content Type	Text
Resource Type	Article
Subject	Biomaterials Forestry

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