Evaluation of a Method for Testing Adhesive-Preservative Compatibility

The current method for testing the compatibility of adhesive-preservative systems used in glulam timbers has not recently been correlated with actual performance. The historically used two-cycle soak-dry delamination method is compared here to a proposed multiple-cycle soak-dry method. To evaluate these, penta-treated and CCA-treated southern pine boards were bonded with phenol-resorcinol at room temperature to represent compatible and incompatible model systems, respectively. The amount of deep wood failure measured with the new method shows great sensitivity to differences in system compatibility. Deep wood failure of the two adhesive-preservative systems differed only slightly before exposure to the new method, but this difference increased after one cycle and continued to increase gradually with increasing cycles. Shear strength measured with the new method was less sensitive to differences in adhesive-preservative compatibility, while delamination measured with the old method was far less sensitive.

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