Assessment of the adhesive capacity of asphalt binders in the aggregate-binder bonds by means of new methodology

Abstract

Manuscript Code: 479Date of Reception/Aceptance: 01OCT2014/01APR2015 Resumen El principal objetivo de este estudio es presentar una nueva metodología para caracterizar la capacidad adhesiva (capacidad conjunta de cohesión y adhesión) de los cementos asfálticos mediante nuevos parámetros mecánicos. Esta nueva metodología está basada en el ensayo Fénix, desarrollado recientemente en España. Este método permite evaluar la resistencia a fisuración de las mezclas asfálticas, pero ha sido modificado para caracterizar el poder adhesivo de los cementos asfalticos. Los principales parámetros obtenidos están relacionados con la energía disipada en la ruptura de los puentes de adherencia entre el árido y el ligante cuando estos materiales están sometidos a esfuerzos de tracción. Los resultados de la fase experimental de investigación son presentados en este artículo, los cuales derivan de la aplicación de la nueva metodología propuesta para evaluar el comportamiento del cemento asfáltico en la matriz árido-ligante de acuerdo a la variación de la temperatura, el efecto del agua y el envejecimiento, tomado en cuenta áridos del mismo origen, pero diferente forma geométrica. Los resultados obtenidos muestran que la metodología propuesta permite caracterizar la capacidad adhesiva de los cementos asfálticos para las condiciones evaluadas.Palabras clave: Ligante de asfalto, aglomerante de agregado ligante, capacidad adhesiva, ensayo Fénix. AbstractThe main goal of this study is to present a new methodology to characterize the adhesive capacity (cohesion and adhesion capacity) of asphalt binders by means of new mechanical parameters. This methodology is based on the Fenix test, a test recently developed in Spain. This method assesses the cracking resistance of the asphalt mixtures, and it has been adapted to characterize the bonding power of asphalt binders. The main parameters achieved with this procedure are related to the energy dissipated during the breaking between the asphalt binder and the aggregate, when these materials are subjected to tensile stress; essential parameters related to the adhesive capacity of asphalt binders. The results of an experimental stage are presented in this research, in which the proposed methodology has been applied to analyse the behaviour of the binder in the aggregate-binder matrix according to temperature variation and the effect of water and ageing; taking into account aggregates of the same origin and with a different shape pattern. The results show that the parameters achieved from this new methodology allows characterizing the adhesive capacity of asphalt binders in the different conditions assessed.

Enhancement of Electrical and Mechanical Properties of Modified Asphalt Concrete with Graphite Powder

“…The load and displacement data are used to dress a load-displacement curve (Figure 10) from which we determine the mechanical parameters that are involved in the cracking process of the material [9].…”

Evaluation of the durability of asphalt mixtures depending on the physical properties of aggregates

“…In parallel, the force and displacement data are recorded until the load decreases to the value of 0.1 kN, ending the test. Using this data, a load-displacement curve is plotted, which makes possible to obtain the mechanic parameters that characterize the crack resistance of the asphalt mixtures (Vidal et al, 2015). The main parameters obtained with the Fenix test are:…”

“…An asphalt mixture is essentially a mix of aggregates and asphalt binder. Both components, individually and in their interaction, play an important role in the final performance of the asphalt mixture (Valdés et al, 2015).…”