Performance Evaluation of Flame-Retardant NSCFR-Treated Laminated Veneer Lumber(LVL) PartⅠ:Thermal, Physical and Mechanical Properties
This study aimed at evaluating the physical, mechanical and thermal properties of a structural laminated veneer lumber(LVL) prepared with self-made fire-retardant NSCFR being applied to the adhesive. Cone calorimeter(CONE), thermogravimetry(TG-DTG) and universal testing machine were utilized to assess the performances. Results showed that: fire-resistant and smoke-suppression characteristics of the fire-retardant treated LVL (FRLVL)were satisfactory. The heat release rate(HRR) of it was smaller than that of the untreated wood and it did not exhibit the typical second pkHRR of wood-based materials. It had a residual mass rate of 33.32% after exposure to fire. Overall production rate of CO and CO2, average specific extinction area and average smoke rate for it were remarkably less than that of unprocessed wood. In addition, FRLVL possesses acceptable physical and mechanical properties. It showed higher density and lower thickness swell after 24h water immersion than the control group and the strength parallel to glue-line parameters in static bending----modulus of rupture(MOR), modulus of elasticity(MOE), shear strength(SS) were 38.698 Mpa ,6.376 GPa and 4.389MPa separately, all of which met the corresponding requirements for structural LVL specified in the China National Standard GB/T 20241-2006.
Y. Q. Wu et al., "Performance Evaluation of Flame-Retardant NSCFR-Treated Laminated Veneer Lumber(LVL) PartⅠ:Thermal, Physical and Mechanical Properties", Advanced Materials Research, Vols. 168-170, pp. 2106-2110, 2011