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Title: A Comparison of the Durability of Two Stake Sizes in Southern Mississippi

Source: In: Proceedings One Hundred fifth annual meeting of the American Wood Protection Association, Hyatt Regency Riverwalk, San Antonio, Texas; April 19-21, 2009 Volume 105, pp. 66-72, 2009

Author(s)Lebow, Stan; Hatfield, Cherilyn; Evans, James

Publication Year: 2009  View PDF »

Category: Conference Proceedings
Associated Research Project(s):   FPL-4723-3  FPL-4851-1A

Abstract: The small stakes used in preservative evaluation are thought to accelerate deterioration relative to larger in-service members, but the extent of the acceleration is poorly understood. This paper compares the durability of the commonly used 19-by 19-mm stakes to larger 38-by 89-mm (nominal 2 by 4) stakes that more closely resemble commodity-size material. The years to reach average ratings corresponding to loss of 10% of the cross section or complete failure were compared for 53 sets of matched 19-by 19-mm and 38-by 89-mm stakes exposed in plots near Saucier, Mississippi. The larger stakes required an average of 2.1 times longer to reach an average rating corresponding to loss of 10% of the cross section, but this ratio ranged from as low as 1.0 to as high as 8.0. It took an average of 2.2 times longer for the larger stakes to fail, with maximum and minimum ratios of 3.5 and 1.4, respectively. The efficacy of the preservative system appeared to have little consistent effect on relative longevity of the two stakes sizes. Linear regression of average years to loss of 10% of the cross section or failure for the two stake sizes yielded Rvalues of 0.60 and 0.69, respectively. The data indicate substantial uncertainty in using the durability of 19by 19-mm stakes to predict the durability of 38-by 89-mm stakes, and by extension, the durability of in-service members.

Keywords: Stake size; durability; ratings; commodity-size; prediction; accelerated life testing; wood preservatives; testing; preservative treated wood; deterioration; regression analysis; service life; uncertainty; exposure tests; Mississippi; field tests; stake tests; stakes; decay; resistance to decay; decomposition of wood; duration; preservation; treated wood; preservatives; failure; accelerated testing

Publication Review Process: Non-Refereed (Other)

File size: 462 kb(s)

Date posted: 05/17/2010
RITS Product ID: 35760
Current FPL Scientists associated with this product (listed alphabetically)
Evans, James W.
Mathematical Statistician
Lebow, Stan T.
Research Forest Products Technologist

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