Siberian Federal University

This study aims to enhance the thermal and moisture insulation properties of asphalt by incorporating eco-friendly organic and inorganic additives. Physical modification was performed using sawdust and calcium carbonate (CaCO₃), while aluminum chloride (AlCl₃) was used as a catalyst for chemical modification. Key tests included thermal conductivity, water absorption, FTIR spectroscopy, and mechanical property evaluations. Thermal conductivity decreased from 0.243 W/m · °C (original asphalt) to 0.124 W/m · °C in the chemically modified sample. Water absorption also significantly declined in modified specimens, particularly those containing CaCO₃ and AlCl₃.These modifications improved insulation efficiency and reduced permeability. The use of natural, low-cost additives enhances environmental sustainability, making the modified asphalt suitable for infrastructure applications in severe climates