Strength and durability of phenol-resorcinol joints of CCA-treated and untreated southern pine

Tests were conducted to determine the influence of chromated copper arsenate (CCA) preservative on the glueline durability of finger-jointed and laminated southern pine posts by measuring cyclic delamination performance and shear block strength before and after exposure to cyclic delamination conditions. Additionally, third-point flexural tests on planks containing a finger-joint at midspan were performed to determine the influence of CCA on joint strength. For the manufacturers pressing conditions, resin system, and preservative retention level, the performance of CCA-treated laminates met AITC requirements for glueline performance in cyclic delamination and shear strength. The mean percentage wood failure of CCA/CCA joints (67.7%) failed to meet the required 70 percent value. Strength of beams containing finger-joints increased with the presence of CCA. These results indicate that a full-size laminated structural post could be used with assurance if manufactured under these conditions. The influence of finger-joint splice arrangements on the performance of full-size posts was evaluated and will be reported separately.

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