Plastic waste greatly contributes to environmental pollution; therefore, using plastic waste in various applications, such as in concrete, is an important waste reduction strategy which could be contributed by the construction industry. This study presents the development of a concrete stress and strain model under compression for confined concrete specimens using polypropylene plastic as a substitution for coarse aggregate. Various short-column specimens were analyzed for stress and strain characteristics, effect of steel confinement, and compressive performance. Steel confinement increased the compressive strength and ductility of the section. The parametric identification of a stress-strain model defined for normal concrete was used in the experimental results to obtain new parameter values for the confinement coefficients k1 that are suitable for cylindrical and square lightweight concrete sections. The stress-strain diagrams for lightweight concrete of experimental cylinder and square column specimens, compared with the stress-strain modeled by the modified coefficients, indicate a fairly close agreement.
- Lightweight concrete
- Polypropylene aggregate