Estudio Comparativo Entre Mezcla Asfáltica Convencional Y Mezcla Asfáltica Modificada Con Polvo De Caucho Reciclado, Para Pavimentos Flexibles En Vías Semiáridas.

Abstract

The purpose of this research was to develop the design of a modified asphalt mixture incorporating recycled rubber powder (PCR) for use in flexible pavements located in semi-arid climates. To this end, a systematic review of previous research was carried out, along with a granulometric analysis of the material available in the study area and a detailed comparison of volumetric and mechanical parameters obtained in similar studies. Through the coding and synthesis of the information collected, patterns of improvement associated with the use of recycled rubber were identified, mainly in terms of Marshall stability, reduction of voids, increased stiffness, and greater durability. Based on the results, a preliminary design was formulated for a dry-modified MDC-19 mixture with 0.5% recycled rubber powder, adjusted to the local granulometry and environmental conditions typical of semi-arid regions. Subsequently, economic feasibility was evaluated using official costs from the National Roads Institute (INVIAS), finding that the modified mix has a lower initial cost and a significant reduction in life cycle cost compared to the conventional mix, with savings of more than 19% over a 30-year horizon. In addition, environmental benefits associated with the use of end-of-life tires were identified, contributing to the sustainability of road infrastructure. Overall, the results show that the incorporation of recycled rubber powder in asphalt mixtures represents a technically, economically, and environmentally viable alternative, suitable for flexible pavements built in semi-arid areas, and constitutes a strategy consistent with the principles of circular economy and sustainable waste management.