Effect of Steaming Temperature and CCA Retention on Mechanical Properties of Southern Pine

A study was designed to investigate the interaction between chromated copper arsenate (CCA) retention and post-treatment steaming temperature on static bending properties of southern pine. Small, clear southern pine samples were treated with CCA at levels of 0.0, 0.6, and 1.5 pcf and steamed for 6 hours at 240?F, 260?F, or 280?F after treatment. Results show that the effect of increasing steam temperature on modulus of rupture and work to proportional limit was highly significant, while the effect of preservative retention was a significant factor only at high retentions. Modulus of rupture was the most severely affected property, while modulus of elasticity was the least affected.

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