An aqueous dispersion of styrene–butadiene rubber copolymer formulated for use as a high-performance bonding agent and admixture in concrete and cement mixes. It enhances adhesion and cohesion, improves durability, and increases overall mechanical performance. The material provides strong resistance to water and moisture-vapor transmission, helps reduce the water-to-cement ratio, and offers excellent adhesion to most building materials, ensuring reliable, long-lasting results across a wide range of applications.