Preparation and thermal performance testing of diatomite-modified asphalt pavements

Abstract

In this study, the efficacy of diatomite as a modifier in asphalt pavements is thoroughly examined. The research primarily focuses on evaluating the thermal performance of asphalt mixtures modified with varying diatomite contents. Key findings indicate significant improvements in the rutting resistance, with the dynamic stability of the 15% diatomite mixture being 3.4 times higher than the control mixture. Additionally, the 10% diatomite mixture shows a 20% increase in bending strain energy density, enhancing low-temperature performance. However, a diatomite content beyond 10% tends to diminish these benefits. Fatigue life at 10% diatomite content is improved by 18%–24%, demonstrating the material’s potential in extending pavement longevity. Water stability tests also reveal notable improvements, with the 15% diatomite mixture exhibiting a 15% increase in tensile strength ratio post-water conditioning. These results collectively establish diatomite as a cost-effective and efficient modifier for asphalt pavements, promoting enhanced durability and performance.