Einfluß der Lagerdauer auf Eigenschaften von Fichtenbrettern

Schulz, H.; Fuchs, A.; Henrici, D.

doi:10.1007/bf02607826

Cited by 1 publication

(3 citation statements)

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“…Furthermore, erosion rates vary with time and thus predicting erosion values by extrapolation from data obtained for a single exposure period has limited precision. Nevertheless, based on our figures for the erosion of earlywood at transverse surfaces, which was only slightly less than that of earlywood at radial longitudinal surfaces, and the results of previous studies, we can cautiously estimate that the rate of end-grain erosion due to weathering would be in the range of 0.1-0.2 mm per year (Schulz et al 1984;Sell and Feist 1986;Arnold and Dost 1990;Arnold et al 1992;Williams et al 2001a). Hence, it is possible that end-grain erosion due to weathering might reduce the length of Douglas fir mining posts over ∼20 years by 2-4 mm.…”

Section: Discussionmentioning

confidence: 44%

“…Nevertheless, based on our figures for the erosion of earlywood at transverse surfaces, which was only slightly less than that of earlywood at radial longitudinal surfaces, and the results of previous studies, we can cautiously estimate that the rate of end-grain erosion due to weathering would be in the range of 0.1–0.2 mm per year (Schulz et al . 1984; Sell and Feist 1986; Arnold and Dost 1990; Arnold et al . 1992; Williams et al .…”

Section: Discussionmentioning

confidence: 99%

“…Wood exposed outdoors ‘weathers to a grey colour and becomes rougher as it checks and earlywood erodes’ (Feist and Hon 1984). The erosion of wood during weathering has been measured using light microscopy and laser profilometry (Browne 1960; Black and Mraz 1974; Feist and Mraz 1978; Feist and Hon 1984; Schulz, Schöppler and Böhner 1984; Sell and Feist 1986; Arnold and Dost 1990; Feist, Rowell and Ellis 1991; Arnold, Lemaster and Dost 1992; Williams, Knaebe, Evans and Feist 2001a, 2001b, 2001c, 2011d). These studies have examined the effects of the following factors on the erosion of wood during weathering: wood species, growth rate, and density; weathering method (natural vs. artificial); chemical treatments; time of exposure, orientation (N, S, E, W) and angle of inclination (0°, 45°, 90°); and surface texture and grain orientation (radial vs. tangential longitudinal).…”

Section: Introductionmentioning

confidence: 99%

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End-grain erosion of Douglas fir wood during natural weathering

Hazneza

Evans

2016

International Wood Products Journal

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We hypothesise that end-grain (transverse) wood surfaces will erode less during natural weathering than side-grain (radial and tangential longitudinal) surfaces. Douglas fir samples were exposed to 10 000 hours of weathering, and confocal profilometry was used to measure depth of erosion of the different planar surfaces. End-grain eroded less than side-grain, but the difference in erosion of end-grain and radial surfaces was only statistically significant if voids in end-grain created by checks were excluded from erosion measurements. Tangential surfaces were the most susceptible to erosion, due in part to the presence of lens-shaped voids caused by erosion of ray tissues. Erosion of earlywood was greater than that of latewood, particularly for end-grain. Erosion of earlywood is caused by thinning of cell walls in combination with transverse and longitudinal micro-checking, which creates loosely bonded cell wall fragments at weathered wood surfaces. We conclude that end-grain erodes less than side-grain surfaces when exposed to weathering, but differences in erosion of these planar surfaces is affected by checking, which complicates measurement of the erosion of wood using confocal profilometry. We discuss this issue, and describe the practical implications of our findings for the use of wooden posts as boundary markers for mining leases.

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Section: Discussionmentioning

confidence: 44%

Section: Discussionmentioning

confidence: 99%