Diseño de una mezcla asfáltica mediante relaciones volumétricas empleando un asfalto modificado

Abstract

This project analyzes the performance of asphalt mixtures designed using the Superpave method, comparing a control mixture with one modified using a ZycoTherm chemical additive. The research evaluates the behavior of both mixtures through volumetric parameters (VTM, VMA, and VFA) and mechanical strength using the indirect tensile strength test (ITS), both in their initial condition and after short- and long-term accelerated aging. The experimental development included the physical and mechanical characterization of fine and coarse aggregates, the evaluation of the asphalt binder, the design of three Superpave gradations, and the selection of the optimal mixture. Subsequently, the additive was incorporated according to technical specifications, and briquettes were produced using rotary compaction. These samples underwent tests for binder content by ignition, determination of densities and voids, and mechanical strength. The results show that the modified mixture maintains greater volumetric stability against aging, exhibits less cohesion loss, and achieves higher ITS values compared to the control mixture. This indicates improved binder-aggregate adhesion, reduced susceptibility to moisture and fatigue, and potentially greater durability under repeated loading conditions. The findings support the use of modified asphalts in high-traffic roads in Ecuador and provide technical evidence aligned with INEN 2280 standards and AASHTO/ASTM guidelines, contributing criteria for future improvements in design specifications and resource optimization in road infrastructure.