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Refinement of bending stiffness and ...

Li, Gan.

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Refinement of bending stiffness and compression strength as measurement of wood decay in accelerated test methods.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Refinement of bending stiffness and compression strength as measurement of wood decay in accelerated test methods./
作者:	Li, Gan.
面頁冊數:	129 p.
附註:	Adviser: Darrel D. Nicolas.
Contained By:	Dissertation Abstracts International67-11B.
標題:	Agriculture, Wood Technology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3240152
ISBN:	9780542947933

Refinement of bending stiffness and compression strength as measurement of wood decay in accelerated test methods.
Li, Gan.

Refinement of bending stiffness and compression strength as measurement of wood decay in accelerated test methods. - 129 p.

Adviser: Darrel D. Nicolas.

Thesis (Ph.D.)--Mississippi State University, 2006.

Wafer distribution schemes were explored for a new soil block decay test which uses compression strength to determine the extent of wood decay. The results showed that randomized complete block distribution minimized variation.

ISBN: 9780542947933Subjects--Topical Terms:

1031154
Agriculture, Wood Technology.

Refinement of bending stiffness and compression strength as measurement of wood decay in accelerated test methods.
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100 1 $a Li, Gan. $3 1297160
245 1 0 $a Refinement of bending stiffness and compression strength as measurement of wood decay in accelerated test methods.
300 $a 129 p.
500 $a Adviser: Darrel D. Nicolas.
500 $a Source: Dissertation Abstracts International, Volume: 67-11, Section: B, page: 6137.
502 $a Thesis (Ph.D.)--Mississippi State University, 2006.
520 $a Wafer distribution schemes were explored for a new soil block decay test which uses compression strength to determine the extent of wood decay. The results showed that randomized complete block distribution minimized variation.
520 $a The mechanical properties of wood are very sensitive to wood decay, but accuracy and reproducibility problems have limited its use in wood decay tests. To address these problems, a modified method of evaluating wood preservatives in an accelerated soil contact test was explored using small decay cups containing unsterile soil and thin (3mm) pine sticks. It was found that the decay rate was rapid, with significant decay being detectable in untreated wood after two months exposure. The extent of wood decay was measured by monitoring changes in the bending elasticity (MOE) of the test samples, which was found to be a sensitive measure of the decay rate for both CCA and CuNap treated as well as untreated wood. The rate of wood decay in both treated and untreated wood samples was accelerated when the soil was amended with wood compost. Use of amended soil also resulted in significantly higher copper depletion rates for CCA treated wood, but not for the CuNap treated wood.
520 $a It was also found that in this study that the MOE of 3mm thick southern yellow pine sticks decreased slightly after three bending cycles with a deflection of 2mm, which is under the proportional limit of the sticks. This finding is in contrast to a general understanding that MOE is not compromized when the deflection is less than the proportional limit. It was also found that sterilizing the sticks by autoclaving resulted in a decrease in MOE of approximately 10%, but no further change was observed when the sticks were repeatedly deflected for six cycles. For decayed sticks, there was only a slight decrease in MOE when they were repeatedly bent for six cycles after the decay was arrested. The proportional limit of the decayed sticks subjected to 2mm deflection was not exceeded until the decay advanced to an MOE loss about 40-50%.
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