Pole Strength Tests

The influence of greensalt and pentachlorophenol treatments on the static bending strength of a total of 395 southern pine poles is given for the years 1939, 1940, 1941, and 1946. The following conclusions were drawn: 1) Greensalt treatments probably increase the bending strength of southern pine poles. 2) When followed by creosote treatment, kiln- drying produces stronger poles than steam seasoning. Kiln-drying may produce weaker poles than air seasoning. 3) A treatment of 50-50 pentachlorophenol-petroleum-creosote has no effect on the bending strength of southern pine poles. 4) Steaming of southern pine poles results in a 16 percent loss in bending strength. 5) Knots above the groundline may be significant in reducing the strength of poles. Relatively small knots, occurring both singly and in groups, were associated with the breaking of one-third of the poles. 6) The strength of tops of southern pine poles in service is probably very close to the groundline strength of the poles, except in very dry soils.

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