Polystyrene concrete is made from a mixture of cement, natural aggregates and polystyrene beads in the form of expanded polystyrene (EPS) or unexpanded polystyrene (UEPS) aggregates. By incorporating the polystyrene aggregate at different volumes in the concrete, mortar or in the cement paste, a wide range of concrete densities can be produced for building applications as well as other specialized applications like the sub-base material for pavement and railway track bed, construction material for floating marine
structures, sea beds and sea fences, energy absorbing material for the protection of buried military structures and fenders in offshore oil platforms [5–13]. Owing to the different applications of EPS concretes, studying the mechanical and durability aspects of EPS concrete have been an interesting and challenging topic for many researchers. The importance of research studies in this area is emphasized by considering the hydrophobic nature and lower density of EPS beads in comparison with the mineral lightweight aggregates [14–17]. Despite a number of research studies on the different properties of EPS concrete, it has rarely investigated in a comprehensive study as concrete with a potential of producing different grades of compressive strength. In this regard, this paper aims to incorporate different percentages of EPS beads as part of aggregates replacement to produce structural, moderate strength and insulating lightweight concrete. Moreover, in view of the global sustainable development, supplementary cementing materials (SCMs) including silica fume and rice husk ash are also considered in this research.