EXPERIMENTAL AND THEORETICAL STUDY OF SUSTAINABLE SANDWICH STRUCTURES WITH RECYCLED PET CORE

Abstract

This thesis investigates the use of recycled polyethylene terephthalate (R-PET) in the cores of sandwich structures to assess their suitability for integration as part of structural components. It commences with an experimental examination and comparative analysis of beams comprised of two configurations of R-PET cores: R-PET foam and R-PET honeycomb. Building on previous studies, which focused solely on a limited number of sandwich beams with PET fibre-reinforced polymer (FRP) facings and R-PET foam cores; this research expands the scope by systematically varying core thickness, density, and facing thickness across these configurations. To enhance the sustainability of the sandwich beams, the effect of utilizing bio-resin in the FRP composite facings was studied, examining how changes in polymer type impact the flexural strength of the beams. Additionally, this study incorporates finite element simulation alongside experimental testing of the sandwich beams to deepen the understanding of the structural properties and potential applications of these materials. The research progresses from beam bending testing and analysis, providing insights into the anticipated flexural performance of large-scale sandwich panels, to creating condensed guidelines for designing structural floors, roofs, and walls using these panels. The final phase involves testing full-scale sandwich panels, with each panel measuring 8 feet (2438 mm) in length, 4 feet (1219 mm) in width, and a core thickness of 6 inches (152 mm), under cyclic transverse loading, reflecting real-world dimensions and conditions. The experimental results are validated through modelling, leading to the creation of a detailed design table. This table provides essential guidance for designers, specifying the maximum allowable spans for the panels under typical dead and live loads, considering both strength and deflection criteria. Through these methods, the research offers insights and practical guidelines for the integration of R-PET core sandwich panels in structural applications.