ANALYSIS OF PROPERTIES OF MODIFIED ASPHALT MIXES IN PANAMA
This investigation proposes the determination and comparison of the technical and economic benefits that the polymers bring to asphaltic cement, by the analyzing of its performing in the asphaltic mixes against their deformation by high temperatures and loads. A laboratory study was made to determin...
|Main Authors:||Kaa, Bredka, Mogoruza, Rogelio, Anguizola, Ivet|
Universidad Tecnológica de Panamá
Modificate asphalt; polymers; modificate asphalt mix; resilient modulus; temperature; deformation; elastic torsional recovery.
This investigation proposes the determination and comparison of the technical and economic benefits that the polymers bring to asphaltic cement, by the analyzing of its performing in the asphaltic mixes against their deformation by high temperatures and loads. A laboratory study was made to determinate the asphaltic cement modification, by using polymers like: Butanol NX 1129, Muestra A1 and Elvaloy, which were added in different portions for the asphalt AC-30 that came from RefineríaTexaco/Chevron. Among the tests conducted we can mention: penetration (25 °C, 100 g, 5 s), rotational viscosity (135 °C and 175 °C), softening point and torsional elastic recovery at 25 °C. The properties of the modificate asphaltic cement were analyzed which improve significantly with polymers, in special the torsional elastic recovery. Some samples were took from the enlargement of CPA Santiago–David, because they were using polymers to modify its roads, to obtain the corresponding test tubs and compare the modified asphalt by the modulus resilient of the asphaltic mix. In addition, the volumetric behavior and Marshall parameters for modified mixtures were examined. In this evaluation it was observed that the resilient modulus of the mix is affected by the particle size, the bulk density of the mixture, unfilled spaces and that polymers reduced temperature susceptibility to deformation. Finally, an economic analysis was performed, showing that the reduction in thickness in the the AASHTO-93 design in asphalt by increasing the magnitude of the resilient modulus by addition of polymers, these results were compared used design temperatures of 25 °C and 40°C, and the minimum values and real project values of CBR.