Much research has been done on concrete using new materials, especially when reinforced with fibers, but researchers did not know how to include the plastic fibers in concrete. However, this study has investigated the effect of replacing natural aggregate with recycled coarse aggregate (RCA) at 25%, 50% or 75%, and adding plastic fiber (PF) at 0.5%, 1%, or 2% in concrete. Compressive strength, flexural strength, tensile strength, and elastic modulus were tested to gain knowledge of concrete behavior, and the study comprehensively covers hardened properties of concrete. The most important results were reached from the analysis of concrete properties, such as substituting a low amount of RCA by 25% and adding a small proportion of fiber by 1% can enhance the strength of a concrete; on the other hand, substituting larger amounts of RCA by higher than 50% and adding greater proportions of fiber up 2% can decrease of strength. The highest increase in compressive strength was recorded when a mixture of 25% of RCA with 1%PF by 10.92% compared to the control mixture.

recycled coarse aggregate (RCA), economical concrete (EC) and sustainable high-performance concrete (SHPC), waste plastic fiber (WPF), compressive strength (CS), flexural strength (FS), splitting strength (SS), modulus of elasticity (ME)