Mechanical performance of engineered bamboo subjected to accelerated aging with single and multiple durability exposures

Abstract

Durability is a critical concern for engineered bamboo structures. The results of an experimental study of the mechanical performance of engineered glue laminated bamboo, bamboo scrimber and Douglas fir specimens subjected to accelerated aging under single and multiple durability exposures are presented. In total, nineteen specimen groups comprising almost 1200 samples were prepared and tested under conditions of ultraviolet radiation, alternating wet-dry cycles, alternating hot–cold cycles, and a combination of all three exposures. Specimen density, dimensional stability and discoloration were reported. Mechanical properties assessed were longitudinal compressive strength and modulus, and bending strength and modulus. Durability exposure related damage of the laminated bamboo and Douglas fir was greater than that of the bamboo scrimber under single and multiple durability exposures; the bamboo scrimber exhibited a better durability resistance. Analysis of variation of the results of the single and multiple exposures indicated that exposure to ultraviolet radiation had the greatest contribution to the durability performance of the three materials.