Structural properties of used plywood

摘要

Results of an experimental analysis of the structural properties of used slab formwork plywood sheathing are presented. The samples tested were obtained from two concrete construction sites in Milwaukee, Wisconsin. All samples tested were 1.2 m x 2.4 m (4 ft x 8 ft), seven-ply, 16 mm (5/8 in) thick plywood sheets. Flexural properties were determined according to the guidelines specified by the American Society of Testing and Materials (ASTM). Interlaminar shear strength was determined using a five-point test method. In this paper, the observed bending stiffnesses, bending strengths, interlaminar shear strengths, and moments of inertia for both face grain parallel and perpendicular to span directions are presented. The observed structural properties are also modeled with appropriate probability distributions. The observed data are used to investigate the correlation between the bending strength and stiffness of plywood.