Effect of egg shell ash and strap plastic waste on properties of high strength sustainable self-compacting concrete

The use of eggshell ash can lead to an increase in the strength of concrete. This study is aimed at investigating the high-strength sustainable performance of self-compacting concrete (HSSCC) through the usage of eggshell ash (EA) as a replacement for cement and reinforced with waste plastic (WP) fiber. Three different ratios of EA (10, 20, and 30%) without WP were added in HSSCC as a first stage, and three portions of WP were reinforced to all specimens in the second stage. Several tests were conducted, including fresh and dry densities, workability, filling and passing capability, and compressive and flexural strengths at 7, 28, and 90 days. The ultrasonic pulse velocity (UPV) was conducted on cube specimens at 28 days. The findings demonstrated that increasing the EA ratio caused a decrease in mechanical properties. Furthermore, compressive and flexural strengths significantly increased with WP reinforcement, and the highest values of 78 and 8.6 MPa were obtained at 10% EA and 1% WP, respectively. The fresh density, workability, and flowability decreased by reinforcing WP at all EA ratios and maximum values of 2180 kg/m 3 , 69 MPa, and 7.2 MPa, respectively, for 90 days were obtained.