Properties of Recycled Concrete utilizing Waste Rubber

Globally, billions of tires are being disposed of, representing a natural danger. Until now, a little part of that waste is reused, and most tires are simply accumulated. The present paper studies the durability phenomena of recycled concrete with partial substitution of fine aggregate by waste rubber tires. Silica fume, fly ash, and Cement Kiln Dust (CKD) were utilized as substitutions for the binding material. The overall substitution material reached about 30% of the cement content. The long-term behavior was surveyed by methods for water retention, chloride ions penetrability at 28 and 90 days, and protection from aggressive media (sulfate) at 1, 7, 14, and 28 days. Likewise, the compressive strength of concrete samples at 7, 14, 28, and 90 days was measured. The presence of cementitious framework, CKD, silica fume, and fly ash limit the utilization of waste rubber. Substitution percentages of up to 10% rubber fraction and 30% paste framework accomplish a satisfying strength level (35 MPa). These blends also exhibit higher protection from sulfuric corrosive assault than the reference blend.