Análisis de estabilidad y flujo de mezclas asfálticas en caliente fabricadas con agregados de Boyacá y asfalto modificado con grano de caucho reciclado por vía seca.

Abstract

Asphalt mixtures consume non-renewable stone materials in high proportions, which give rise to unalterable consequences for the environment. Based on previous research, an alternative for change is the use of recycled rubber granules (RCR), since it reduces maintenance and increases the durability of the roads. It also offers the option of minimizing waste from national and international industries coming from disused tires.

The research begins with a background review on the implementation of GCR, recognizing the projected dosages for hot dense mixes type MDC-19 according to INVIAS 2022 specifications and thus evaluating its optimal implementation with detailed combinations of stone aggregates from some quarries in Boyacá, highlighting in this research the origin of the materials and the benefits in the properties acquired by the briquettes. For this purpose, different material characterization and hot asphalt mix design tests were carried out, such as stability and flow by means of Marshall's methodology, in order to analyze its performance in comparison with a traditional asphalt mix.

In addition to the comparative analysis, the objective is to know if this modified asphalt mix complies with the minimum conditions set forth in the INVIAS 2022 general specifications for road construction and also to provide the environment and the road infrastructure sector with a positive impact.

To carry out this research, a modified asphalt mix type MDC-19 was designed, substituting 8, 12 and 16% percentages of asphalt cement with GCR (2.00 mm granulometry). Subsequently, the mechanical improvements in each briquette were evaluated, establishing that the ideal percentage to work with is 8%. It should be noted that we worked with the Marshall methodology, by dry manufacturing.