Precast slabs using recyclable packaging as flooring support elements

In this study, the substitution of ceramic components by recyclable PET bottles, aluminum cans and Tetra Pak cartons, used as an in fill material for semi-precast slabs, was investigated experimentally. The slabs were produced in full scale, with mean measurements of 1 m (width) × 3 m (length). The compressive strength and elastic modulus of the concrete were determined. The slabs were characterized according to their density and flexural strength. Economic viability analysis was also performed. The flexural strength of the reference slab was 31 kN, while the strengths of slabs using reusable packaging were 36-38 kN. A 20% reduction in mean density is another important advantage, because it reduces the weight for the manufacture, transportation and the total weight of the structure, thus reducing the cost of the structural design while facilitating the construction process. The direct costs of the materials required to manufacture the slabs were equivalent. Comparisons between the prototype slabs with different flooring support components indicate that these are feasible concerning both their fabrication and their structural performance.