Evaluación de los parámetros mecánicos de una mezcla asfáltica sometida a las condiciones ambientales de la ciudad de Bogotá D.C.

Abstract

ResumenEl artículo presenta el cambio que experimenta el módulo resiliente, la deformación permanente y la resistencia a fatiga de una mezcla de concreto asfáltico cuando es expuesta a las condiciones climáticas de la ciudad de Bogotá D.C. (Colombia) durante 47-48 meses. Las mezclas fueron fabricadas utilizando dos cementos asfálticos (CA) fabricados en Colombia: CA 80-100 y CA 60-70. La tendencia general de las mezclas con el tiempo de exposición es experimentar un aumento en los valores de rigidez debido principalmente a procesos de endurecimiento por envejecimiento del ligante asfáltico. El aumento en rigidez genera incremento en la resistencia al fenómeno de ahuellamiento y en la vida de fatiga de la mezcla analizada cuando ésta sea utilizada para conformar capas asfálticas gruesas en el pavimento. Con base en la evolución del módulo resiliente con el tiempo de exposición al medio ambiente se propone una ecuación para predecir de manera aproximada el cambio que experimenta la vida a fatiga de la mezcla.Palabras Clave: Módulo resiliente, ley de fatiga, envejecimiento, mezcla asfáltica densa en caliente, cemento asfáltico AbstractThe present paper introduces the evolution of resilient modulus, permanent strain and fatigue life of an asphaltic concrete mixture exposed under weather conditions in Bogota D.C. (Colombia) during 47-48 months. Mixtures were elaborated by using two asphaltic cements (CA) made in Colombia: CA 80-100 and CA 60-70. Mixtures generally tend to increase their stiffness values after an exposure period, mainly due to hardening and ageing processes undergone by asphaltic binder. A stiffness gain leads to increase endurance against rutting phenomenon and fatigue life of the analyzed mixture employed to lay thick asphaltic layers on the pavement. Based on the resilient modulus evolution due to exposure under environmental conditions, an equation is proposed to approximately predict the evolution of fatigue life endured by a mixture.

Marshall parameters for quality control of hot mix asphalt after pavement construction

“…Aging of bitumen occurs as an increase in its viscosity and moisture, while damage is presented as a loss of cohesion and adhesion between bitumen and the aggregate interface. Rondón Quintana & Reyes Lizcano (2012) analyzed with time the variation of resilient modulus, permanent deformation and fatigue resistance of asphalt mixtures in Colombia. For mixes made with asphalt bitumen CA 60-70 an increase in stiffness is generally produced by aging of the bitumen, resulting in an increase of the rutting and fatigue cracking potential.…”

Effect of the recycled rubber grain in the rutting of an asphalt mixture type MD-12

“…According to this, a series of investigations have been developed in which it is sought to evaluate the usefulness of some recyclable materials, which are transformed into new products or materials, thus incorporating into the productive cycle, highlighting materials such as paper, plastic, glass, rubber and metals [3]. Asphalt mixtures have been evaluated in recent years with the addition of materials such as synthetic fibers [4], PVC polyvinyl chloride [5], polyethylene PEBD [6], blast furnace slags [7], [8], among others, which allow improvements in the mechanical properties of asphalt mixtures [9] and in the same way they contribute to the mitigation of different environmental problems associated with the mishandling of the waste of said materials.…”