Fresh and Hardened Properties of Self-Compacting Concrete containing Waste Materials and Recycled Coarse Aggregate.

Currently, the use of waste materials and recycled aggregates in concrete production is increasing to achieve sustainability in the construction industry. This approach is essential because the resources for natural aggregates are decreasing worldwide. Using recycled aggregates and waste materials in self-compacting concrete (SCC) production is a promising strategy to address environmental concerns and enhance sustainability. This study investigates the combined impact of ground-granulated furnace slag (GGBS), wood waste ash (WWA), and recycled coarse aggregate (RCA) on the workability and strength of SCC. Recycled coarse aggregate (RCA) has been used as a substitute for natural coarse aggregate (NCA). In volume ratios of 0, 50, 100%, and for each of these percentages, 20% of the cement weight was replaced as following; 20% for WWA, 10% for WWA with 10% GGBS, 20% for GGBS, in addition to reference mixture which containing a cement percentage of 100%. The experimental program evaluates fresh properties (slump flow, V-funnel flow, and passing ability) and hardened properties (compressive strength and split tensile strength). Results indicate that increasing RCA content from 0% to 100% reduces slump value from 780 mm to 730 mm. Compressive and split tensile strengths decrease by 12.14% and 2.67%, respectively, with the increase of RCA from 0 to 100%. Using WWA and GGBS as cement replacements reduces compressive strength by 40.92% and 6.74%, respectively. Therefore, it is recommended to incorporate other waste materials with high pozzolanic reactivity to enhance SCC strength containing RCA.