Influence of the water in warm dense mixtures Type 2 (MDC-2)

Abstract

The main reasons of the deterioration of asphalt mixtures in a structure of flexible pavement are originated by the charges imposed by the traffic and the environmental agents. Regarding with to the environmental agents, one of the principal ways of asphalt mixtures in situ happens when the aspheltic. The condition of the knowledge in this area is that in spite of the high number of realized investigations, this way of damage and the reasons that generate it have not been totally understood and identified. This article presents the evolution in laboratory of the change in the mechanical properties that experience an asphalt warm dense mixture type 2 (MDC-2) (in agreement with the specifications of the INSTITUTO NACIONAL DE VIAS - INVIAS, 2007) and the asphalt cements (CA) CA 80-100 and CA 60-70 when they are immersed in water during a period of time of five months. The evaluated property is the mechanical resistance under monotonic load of indirect traction by means of the Marshall test. From the obtained results the conclusion is that this resistance diminishes when the asphalt mixtures are plunged, whereas the mixtures that are made by the asphalt plunged cements increase the parameters of stability and inflexibility.