Avaliação mecânica de misturas asfálticas com adição de dióxido de titânio (TiO2).

Abstract

Over the years, engineering has sought advancements across its various sectors. In this context, the pavement sector has focused on improving the wearing course through the addition of alternative materials, aiming to enhance its properties, trafficability, and durability. In this regard, Titanium Dioxide (TiO₂) is a material with great potential for application in bituminous mixtures due to its photocatalytic capacity—that is, its ability to purify air pollutants. Thus, this research aims to evaluate the mechanical properties of asphalt mixtures incorporating TiO₂ at different contents (2% and 3%), partially or fully replacing hydrated lime. To carry out this analysis, several mechanical tests were conducted, namely: Indirect Tensile Strength (ITS), Moisture-Induced Damage (Lottman test), Resilient Modulus, and Permanent Deformation (Flow Number). Based on the results, it was possible to conclude that the incorporation of titanium dioxide contributed to improved tensile strength and resistance to moisture-induced damage, while a reduction in permanent deformation was observed. Additionally, it was noted that the mixture containing 2% TiO₂ showed an increase in the resilient modulus, whereas the mixture with 3% TiO₂ showed a decrease in this value when compared to the reference mixture. Finally, the use of titanium dioxide in asphalt mixtures demonstrated a considerable improvement in certain mechanical properties.