Flexural Creep Behavior of Redwood Heartwood During Drying from the Green State

Deflections were determined during drying from the green state for statically loaded small beams of redwood heartwood. Correlations were made involving relative creep, initial moisture content, extractive content, and green volume specific gravity. A significant positive correlation was found between extractive content and initial moisture content. In end-matched pairs of samples tested at 106?F., it was common that the sample with the highest extractive content and moisture content crept the least. Prefreezing significantly reduced creep in all three types of tests conducted. This suggests that collapse in the drying of redwood is actually due to excessive creep, which occurs in response to shrinkage-induced stresses, and that prefreezing eliminates collapse by reducing the tendency for creep at high, temperatures.

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