Effect of wood species, clamping pressure and glue spread rate on the bonding properties of cross-laminated timber (CLT) manufactured from tropical hardwoods

摘要

The effects of wood species, clamping pressure and glue spread rates on the joint strength of cross-laminated timber (CLT) manufactured from four tropical hardwood species were studied. CLT boards were fabricated from batai (Paraserianthes falcataria), sesendok (Endospermum malaccensis), rubberwood (Hevea brasiliensis) and kedondong (Canarium sp.). These species have densities ranged from 380 to 750 kg/m(3). Three layers CLT were prepared by applying pressure of 0.7 and 1.4 N/mm(2) (100 and 200 psi respectively) and glue spread rates of 200, 250 and 300 g/m(2), single glue-line. Block shear bond strength, wood failure percentage and delamination percentage of the CLT specimens were determined as function of clamping pressure and glue spread rate. The results revealed that glue spread rate significantly influenced both the shear bond strength and wood failure percentage of the CLT. Clamping pressure, on the other hand, had no effect on bonding properties of the CLT despite various range of wood density. Delamination behavior of the samples also was not influenced by both clamping pressure and glue spread rate. Overall, properties determined in this study met the minimum values required in BS EN 16351 standards. (C) 2020 Elsevier Ltd. All rights reserved.