Disposal of decommissioned chromated copper arsenate (CCA)–treated wood as landfill has become an important environmental concern. Reusing and recycling decommissioned treated wood seems to be the most practical environmental solution to the problem. In a previous report, 6-ply laminated beams made from decommissioned CCA-treated southern pine (Pinus spp.) wood utility poles and 6-ply laminated beams made from untreated virgin wood were studied to evaluate the effects of surface preparation method and cross-sectional region (high or low CCA retention) on bonding shear strength, wood failure, and delamination. In this study, 6-ply laminated beams having the same composition as those of the previous study were made and then pressure-treated (i.e., retreated) with CCA prior to being evaluated in the same manner as in the previous study. This study revealed that gains in CCA retention (as a result of retreatment with CCA) for beams made from decommissioned utility pole wood were similar to the gains for beams made from untreated virgin wood. CCA retreatment had little overall effect on either glue-line shear strength or wood failure of beams made from decommissioned wood utility poles, but overall substantially increased shear strength and wood failure of beams made from virgin wood. CCA retreatment also reduced the delamination of both beams made from decommissioned utility pole wood and beams made from virgin wood. Additional testing is warranted to further investigate the bonding performance of decommissioned CCA-treated transmission utility pole wood.
The authors are, respectively, Assistant Professor, Calhoun Research Sta., Louisiana State Univ. Agric. Center, Calhoun (email@example.com); Associate Professor, Dept. of Experimental Statistics, Louisiana State Univ., Baton Rouge (firstname.lastname@example.org); Principal Wood Scientist, USDA Forest Serv., Southern Research Sta., Pineville, Louisiana (email@example.com); and Professor, Calhoun Research Sta., Louisiana State Univ. Agric. Center, Calhoun (firstname.lastname@example.org). This paper (2009 to 255-2378) is published with the approval of the Director of the Louisiana Agric. Experiment Sta. This paper was received for publication in February 2009. Article no. 10582.
*Forest Products Society member.