Performance Evaluation on Nanocomposite Clay Modified Rubberized Binders

Abstract This study explores the impact of adding nanocomposites to rubberized asphalt binders using wet mixing methods, employing Superpave and Multiple Stress Creep Recovery (MSCR) tests along with statistical analysis. It finds that while crumb rubber typically raises the viscosity of asphalt binders, making them less easy to use, the effect varies with different nanocomposite clays: kaolinite tends to decrease viscosity, whereas montmorillonite increases it. A standout discovery is the enhanced performance of a mixture with 10% crumb rubber and 3% montmorillonite clay, which significantly reduces rutting and boosts fatigue resistance, surpassing traditional binders. This suggests a synergistic effect beneficial for improving road durability and reducing maintenance. Although these clays enhance rutting resistance, their effect on fatigue resistance is more ambiguous. All tested binders meet the Superpave stiffness standard (below 300 MPa), and the composite blend also shows potential for better low-temperature performance. The research underscores the complex interplay between modifiers and asphalt binders, emphasizing the necessity of a comprehensive approach in their development and evaluation. These findings are crucial for advancing sustainable and long-lasting road construction methods, stressing the importance of holistic strategies in material innovation and assessment.