Influencia de los asfaltos mejorados con rejuvenecedores en el comportamiento de las mezclas asfálticas.

Abstract

Recycling additives are commonly used for reclaiming asphalt paving mixes. Some preliminary studies developed at the Universidad Católica de Santiago de Guayaquil, show promising results by applying the additives directly to Ecuadorian asphalt in order to enhance its properties once it has aged. This study´s objective is to evaluate, experimentally, the effect of using enhanced asphalts with recycling additives on the asphalt´s mix behavior, while keeping the aggregate´s characteristics, and compare the results to determine the agent´s practical value in real life situations. Two Ecuadorian asphalts were used, PG 64-22 and PG 64-28, and were mixed with different kinds of recycling additives (Hydrolene, Sylvaroad y Danox) and with one base oil, while varying the proportions applied on the six developed combinations. A compact mix was selected with basaltic mineral aggregates and an asphalt percentage of 5.5 for each combination. Laboratory tests of Marshall stability, stiffness modulus, uniaxial cyclic compression test and fatigue were applied to asphalt mix specimens. Besides, the damage due to water was evaluated through retain resistance using TSR. The study showed that using asphalt with recycling a aditives enhanced the performance to fatigue of the asphalt mix. Nevertheless, the damage by water in three out of six mixes reached inadequate results. In general, the mix where the additive Sylvaroad was used, had a better performance than the others.