This report summarizes the quality inspection results of the glued-laminated timber (glulam) used in the urban ecological log cabin community project. The glulam is composed of spruce laminations (each with a thickness of 30mm, a common specification for structural glulam) and bonded with waterproof phenol-formaldehyde adhesive, which meets the requirements of GB/T 26899-2011《Glued-Laminated Timber》. The inspection was conducted on 20 sets of randomly sampled glulam pieces on the 7th day after the completion of production.
First, the material and bonding quality were verified. Each lamination showed no defects such as decay, dead knots (exceeding 10mm in diameter), or splits; the moisture content of the laminations was tested to be 10%-14%, consistent with the standard requirement for glulam. The bonding interface between laminations was checked by visual inspection and ultrasonic testing: no gaps, delamination, or adhesive overflow was found, and the bonding strength test showed an average value of 12.5MPa, higher than the minimum standard requirement of 10MPa.
Next, dimensional accuracy and surface quality were inspected. The cross-sectional dimensions of the glulam (150mm×300mm, a typical size for load-bearing beams) had an allowable error of ±2mm, and the actual measurement results were within this range; the surface was smooth after sanding, with no burrs, scratches, or uneven adhesive residues. Finally, structural performance tests were carried out: in the bending test, the glulam beams withstood a maximum load of 8kN without obvious deformation or cracking; in the shear test, the shear strength reached 8.2MPa, meeting the structural safety requirements for log cabin load-bearing components. In conclusion, all inspected indicators of the glulam meet the project’s quality and safety standards and are qualified for on-site installation.
