Effect of Delay Between Treatment and Drying on Toughness of CCA-Treated Southern Pine

Small clear specimens of southern pine were treated with chromated copper arsenate (CCA) type C preservative, maintained in a saturated condition for various periods of time (time delay), and dried using a technique intended to simulate kiln-drying conditions in full-size members. At CCA retentions of 0.6 pound per cubic foot (pcf), toughness was reduced an average of 20 percent but was not further affected by increasing periods of time delay. At CCA retentions of 2.5 pcf, toughness was reduced 36 percent when dried immediately after treatment and by an additional 11 percent when exposed to time-delay periods of up to 28 days. Small clear test specimens may be more sensitive to changes resulting from treatment and processing variables than are specimens of structural sizes. Therefore, results of these experiments should not be assumed to be directly applicable to full-size dimension material.

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