Abstract
•Direct and Indirect Plastic Replacement in Concrete.•Fresh Concrete Properties varied differently for direct and indirect replacement.•Hardened Concrete properties decreased for both replacement types.•Thermal conductivity and Durability Related properties had different trends.
Plastic due to its versatility, lighter weight and durability properties has become an essential part of human lives. The global plastic production is growing significantly every year; while the amount of plastic being effectively recycled is comparatively low, imposing negative impacts on the environment and sustainability. Recently many efforts have been made to develop effective means for the consumption of plastic waste to diminish its environmental impact. In this regard, the incorporation of plastic waste, as received or shredded plastic particles (direct) or plastic-based synthetic aggregates (indirect) in concrete as a replacement for natural aggregate has been studied extensively in last few decades.
The current paper put forwards a comprehensive and detailed review of the previous studies conducted to evaluate the effect of sustainable synthetic aggregate replacement on the fresh, hardened, physical and durability related properties of the resulting concrete. The difference in the direct and indirect replacement of plastic on the workability, fresh and dry density, mechanical strengths, modulus of elasticity, Poisson’s ratio, failure mechanism, abrasion resistance, micro structure analysis, drying shrinkage, creep, fire resistance, thermal conductivity, water absorption and chloride ion penetration are presented in the current paper.