KEKUATAN KAYU LAMINA YANG DIBUAT DARI TIGA JENIS KAYU

Abstract

The  results  of  strength   test  of  solid  and glue  laminated   timbers  represented   by  Kapur,  Teak  and  Red  Meranti  are reported  in this paper.  The method   used for  the  testing  was the  ASTM  D 143-1970.

For  the purpose   of  the  test,  8 x  12 x  400  cm  lumbers  of  the  three species  were divided  into  two groups  being de- signated  respectively  for  test  in solid  and glue  laminated    form.   The  first  group  were tested  for modulus of rupture,  com- pression  parallel  to  the grain and shear strength  under  air dry  condition.  In  bending  tests,  two  methods  of  loading  were applied,  namely  perpendicular   and parallel  to  the  laminae   in case  of glue laminated   timbers,  and along radial or tangential direction  for solid timbers.

The  second   group   were  resawn  further   into  0. 9  cm  and   1.  9 cm  thick    timber  strips,  respectioely,   for  small size tests  of  the  glue  laminated  specimens.    The  0.9  cm  thick  strips  which  were air-dried  and   then   glued  with   CIBA  Phenol resorcinol-formal-dehyde     adhesives,  were designated   for  test  on  modulus   of  rupture  and  compression.    The  1.9   cm   thick strips  were divided  further   into  five  batches,   and each of which  were dried respectively  until  25,  20,  15,  10 and  5 percent moisture   content   before   glueing  with  the  above   mentioned   adhesive   into  six  different  combination   of  test pieces  namely Teah-Meranti   (JM),   Teak-Kapur  (JK),  Meranti-Kapur    (MK),  Kapur-kapur   (KK),   Teak-Teak     (JJ) and  meranti-Meranti    (MM).

The  results  of  the  tests  are presented   in  Table   1   and  2  for  modulus   of  rupture   and  compression  parallel  to  the grain;  and Tabel 3 and 4 respectively  for  the shear   tests of the six  lamination   combination.