W. v. Roth’s scientific contributions

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Publications (1)


Important structural properties of pinus durangensis martinez
  • Article

February 1986

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10 Reads

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3 Citations

European Journal of Wood and Wood Products

W. v. Roth

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Maria de los Angeles Rechy de v. Roth

Comprehensive test series, mainly based on German standards, were carried out to determine elasto-mechanical properties and hygroscopic behaviour of Pinus durangensis Martinez. Where ASTM standards required specimen sizes which differed widely from DIN specimens, tests were carried out also according to ASTM standards. Pinus durangensis was found to have a slightly higher density than Pinus sylvestris L. For this reason some elasto-mechanical properties as well as swelling and shrinking were greater than for P. sylvestris L. Growth characteristics, quantity and distribution of defects are similar for both species. Therefore, if the same grading system is applied, the same coefficients can be used for both species or for comparable pines from growth areas in temperate zones. Zur Bestimmung der Festigkeitseigenschaften und des hygroskopischen Verhaltens des Holzes von Pinus durangensis Martinez wurden umfangreiche Prüfserien, im wesentlichen auf der Grundlage deutscher Normen, durchgeführt. In den Fällen, bei denen die Probenformen erheblich von jenen abwichen, die in den nordamerikanischen ASTM-Normen gefordert sind, wurde zusätzlich nach ASTM geprüft. Die Rohdichte von P. durangensis wurde als etwas höher liegend als diejenige von P. sylvestris L. festgestellt. Aus diesem Grund lagen auch einige physikalisch-mechanische und hygroskopische Eigenschaften höher als bei P. sylvestris. Die Charakteristik des Wuchses ebenso wie die Verteilung und Anzahl von sog. Holzfehlern sind bei beiden Arten ähnlich. Sofern das gleiche Sortiersystem verwendet wird, können für beide Holzarten dieselben Materialfaktoren eingesetzt werden, desgleichen für vergleichbare Pinus-Arten der gemäßigten Zonen.

Citations (1)


... Compared to some of the more common structural timbers in Mexico such as pino colorado (Pinus durangensis) (v. Roth & Rechy, 1986), habillo (Hura polyandra) (Bravo & Fuentes, 1993), caoba (Swietenia macrophylla) (Richter & Oelker, 2002;Sell, 1989) and other Persea species (Wood Explorer, 2009;USDA Forest Service, 2009) in the same density range, avocado branch wood is below average in bending, compression and tension. However, the values obtained compare favorably with lighter weight nonstructural timbers such as melina (Gmelina arborea) (Obregón, 2009;Rojas et al., 2004;Fujiwara et al., 1996), cedro (Cedrela odorata) (Escobar et al., 1993;CIRAD-Forêt, 2009) and parota (Enterolobium cyclocarpum) (Bravo & Fuentes, 1993) (Table 3). ...

Reference:

Strength properties and natural durability of Avocado (Persea americana Mill.)
Important structural properties of pinus durangensis martinez
  • Citing Article
  • February 1986

European Journal of Wood and Wood Products