2021 Volume 67 Issue 2 Pages 100-108
In order to evaluate the bonding strength between cross layers of CLT, we carried out three shear tests: torsion test, block shear test according to JAS 3079, and block shear test loaded at 45 degrees to the fiber direction. As a result, adhesive types had no effect on shear strength, and air-dried density of specimens had positive correlation to shear strength in each test method. Shear strength derived from linear regression between air-dried density of specimens and shear strength in block shear tests were approximately 45%-57% of the torsional strength. However, those of the block shear test loaded at 45 degrees direction were approximately 90%-94% of the torsional strength. In addition, block shear test loaded at 45 degrees to the fiber direction was shown to be useful as a method for evaluating the bonding strength between cross layers of CLT, because rolling shear is avoided and it can be carried out with a general-purpose test device.
