Effect of Treated Crumb Rubber on Mechanical Properties of GGBS-WCT Based Rubberised Geopolymer Concrete

This study examines the effect of incorporating treated crumb rubber (CR) as a partial substitute for sand on the engineering properties of rubberized geopolymer concrete (RGC) formulated with Ground Granulated Blast Furnace Slag (GGBS) and Waste Clay Tiles (WCT). The primary aim is to assess the impact of different CR content levels (0%, 5%, 10%, 15%, and 20%) on the physical and mechanical properties of RGC. The experimental methodologies encompass water absorption testing, surface abrasion resistance assessment, and compressive strength evaluation. The findings indicate that elevated CR content typically results in greater water absorption due to the porous characteristics of the rubber particles; yet, all measurements were within permissible durability thresholds. The abrasion resistance is enhanced with increased CR content, with 10% and 15% exhibiting optimal resistance attributable to the elastic properties of rubber. The compressive strength diminished with increased CR percentages; however, the 10% CR mixture maintained a strength exceeding 42 MPa, rendering it appropriate for structural application. In summary, a 10% CR replacement provides the optimal equilibrium of strength, durability, and sustainability. This supports the use of recycled rubber and industrial by-products in the production of eco-friendly concrete.