Test assemblies for monitoring decay in wood exposed above ground

Groot, R. C. De

doi:10.1016/0964-8305(92)90014-f

Cited by 14 publications

(4 citation statements)

References 1 publication

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“…This is an existing disadvantage of the current E25 decking specimens. Other methods that use stacks or layers of somewhat smaller specimens that serve to trap moisture while still allowing disassembly for internal inspection may warrant further consideration (De Groot 1992, Jenkins 2012, Meyer and others 2016. The E27 accelerated lap-joint method does use two layers, but it appears that larger pieces and/or additional layers are needed to enhance moisture trapping.…”

Section: Observed Specimen Temperaturesmentioning

confidence: 99%

Internal moisture content and temperature of standardized aboveground wood durability test specimens

Lebow¹,

Lebow²

2018

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Durability of wood products intended for use in outdoor aboveground applications are evaluated using one or more standardized test methods. These methods use relatively small specimens in an effort to accelerate decay growth and allow detection of decay. In this study, we evaluated internal moisture content and temperature of standardized specimens and compared them with specimens of a simulated post and beam connection that is recommended for residential deck construction. Specimens of each type were cut from endmatched Southern Pine timbers and exposed above ground at a test site near Madison, Wisconsin. Pairs of stainless steel screws were inserted at multiple locations within each specimen to allow moisture content determination with a resistance-type moisture meter. Internal temperature was monitored in one specimen of each type using a thermistor probe and data logger. The specimens of the simulated post and beam connection sustained higher moisture contents and experienced less moisture content fluctuation than any of the standardized test specimens. Internal temperature also varied by specimen type but not to the extent observed for moisture content. The findings of this study suggest that frequent drying of standardized specimens has the potential

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Section: Observed Specimen Temperaturesmentioning

confidence: 99%

Internal moisture content and temperature of standardized aboveground wood durability test specimens

Lebow¹,

Lebow²

2018

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“…Above-ground tests are useful for evaluating the natural durability of building components intended for applications protected from the environment (Clausen and Lindner 2011;Clausen and others 2006;Eslyn and others 1985;Highley 1995;Räberg and others 2005). A number of standardized and alternative test designs have been evaluated; e.g., post-rail, cross braces, Y-joints, simulated deck test, L-joints, and lap joints (DeGroot 1992;Hedley and others 1995;Morrell and others 1998;Morris and McFarling 2007), with L-and lap-joints most commonly used. One alternative test assembly, the simulated deck test, addresses the need for accelerated test methods to speed up the otherwise lengthy period of time necessary to acquire sufficient performance data for new preservatives (Williams and others 1995;Morris and McFarling 2007).…”

Section: Objective and Scopementioning

confidence: 99%

Evaluating Naturally Durable Wood Species for Repair and Rehabilitation of Above-Ground Components of Covered Bridges

Kirker¹,

Clausen²,

Blodgett³

et al. 2013

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“…It is well-known that these elevated moisture contents facilitate decay growth, as damages on existing structures are predominantly found in such areas (see Robbers et al 2018). Also, standardized specimens used for accelerated decay testing in above-ground conditions are, in general, designed as joints to facilitate decay growth (Groot 1992;Meyer et al 2016). Several research studies have investigated the moisture conditions in joints through continuous moisture monitoring (see Gaby and Duff 1978;Isaksson and Thelandersson 2013;Fredriksson et al 2016;Niklewski et al 2018).…”

Section: Introductionmentioning

confidence: 99%

The effects of joints on the moisture behaviour of rain exposed wood: a numerical study with experimental validation

Niklewski

Fredriksson

2019

Wood Material Science & Engineering

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Joints in timber structures are particularly vulnerable to degradation due to their tendency to trap moisture. The mechanisms involved, and their effect on the moisture conditions of wood, are here investigated numerically. The horizontal member of a rail and post-type configuration is modelled numerically by a two-dimensional diffusion model with material properties for Norway spruce. Contact areas are assumed to be fully wetted when the specimen is exposed to free water but are unable to interact with the ambient air. Water that is absorbed through such areas cannot dry out through the same surface and is instead redistributed. The model was validated against experimental data, both previously unpublished data and data obtained from the literature, including both laboratory and outdoor exposure. The numerical solutions were, in general, consistent with the measured data. The model provides a simple, yet accurate, method to estimate the moisture conditions in certain types of wood joints. In addition, the spatial distribution of time spent above 25% moisture content was calculated, in order to investigate the suitability of the model for durability applications. ARTICLE HISTORY

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Test assemblies for monitoring decay in wood exposed above ground

Cited by 14 publications

References 1 publication

Internal moisture content and temperature of standardized aboveground wood durability test specimens

Internal moisture content and temperature of standardized aboveground wood durability test specimens

Evaluating Naturally Durable Wood Species for Repair and Rehabilitation of Above-Ground Components of Covered Bridges

The effects of joints on the moisture behaviour of rain exposed wood: a numerical study with experimental validation

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