Bond strength of resorcinolic adhesives on northeastern hardwoods

Trials using commercially available adhesives designed (in most instances) for laminating softwoods were used to laminate hardwoods to determine if suitable glueline performance could be achieved under the performance criteria of ANSI/AITC A190.1-83. Results showed that room-temperature setting adhesives G-1131, LT-75, and LT-5210 exhibited satisfactory glueline performance (shear strength and percent wood failure) on dense red oak using assembly times between 0 to 30 minutes, 10 to 30 minutes, and 30 minutes, respectively. Acceptable glueline performance on red maple was observed with adhesives G-1131, GP 4213, and LT-75 at assembly times ranging between 0 to 30 minutes; whereas LT-5210 exhibited satisfactory glueline performance on red maple at assembly times of 20 and 30 minutes. Similar results were obtained with the adhesives G- 1131 and LT-75 using assembly times between 0 and 30 minutes and with LT -5210 using assembly times between 10 to 30 minutes on yellow-poplar, a low density species. Trials with the adhesive G-1260 showed that satisfactory glueline performance was obtained on red oak after 24 hours of precuring at 72?F and 50 percent relative humidity followed by resin curing at elevated temperatures or 14 days of precuring at 72?F and 50 percent relative humidity followed by resin curing at elevated temperatures. These results suggest that final adhesive cure may be achieved during the elevated-temperature creosote treatment of glued-laminated timbers. Satisfactory glueline performance with adhesive G-1260 was observed with red maple and yellow-poplar following adhesive cure at 72?F and 50 percent relative humidity for a 7-day period.

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