IMPACT OF VARIOUS CHEMICALS ON COMBUSTION PROPERTIES OF HEAT-TREATED AND IMPREGNATED LAMINATED VENEER LUMBER

摘要

The aim of this study was to investigate the effects of borax and boric acid on the combustion properties of heat-treated and laminated veneer lumber (LVL) produced with Anatolian black pine (Pinus nigra J.F. Arnold subsp. nigra var. caramenica (Loudon) Rehder) wood. The combustion test method was performed in three stages according to ASTM E 160-50 1975. Consequently, the highest weight loss (WL) was obtained in unimpregnated and unheat treated and glued specimens with D-VTKA (91.75 %) adhesive; the highest temperature of flame source (TFS) was obtained in unimpregnated and heat treated at 210 degrees C and glued specimens with D-VTKA (678 degrees C) adhesive; the highest temperature of without flame source (TWFS) was obtained in unimpregnated and heat treated at 180 degrees C and glued specimens with D-VTKA (673 degrees C) adhesive; and the highest temperature of glowing stage (TGS) was obtained in unimpregnated and unheat treated and glued specimens with MF (224 degrees C) adhesive. In consequence, heat treatment decreased the fire properties of LVL specimens, relatively, and MF gave better results than DVTKA. Additionally, boron compounds had some efficacy in retarding flame spread on wood surfaces, especially borax.