DOI:
https://doi.org/10.14483/22487638.9247Publicado:
2014-12-01Número:
Vol. 18 (2014): Special Edition DoctorateSección:
Estudio de casoMechanical resistance of a chemically-modified warm mix asphalt
Resistencia mecánica de un asfalto de mezcla caliente químicamente modificado
Palabras clave:
chemical additive, foamed asphalt, hot mix asphalt, mechanical behavior, warmmixasphalt. (en).Palabras clave:
chemical additive, foamed asphalt, hot mix asphalt, mechanical behavior, warmmixasphalt. (es).Descargas
Resumen (en)
Warm Mix Asphalt (WMA) technology offersa wide range of potential for use in road construction projects. Although the principal advantage of using WMA mixtures is environmental, there are also noteworthytechnical and economic benefits. Thispaperdiscusses results for the laboratory evaluation ofWMAmixtures and their subsequent comparison totraditional hot mix asphalts (HMA). WMA and HMA mixtures of nominal maximum aggregate size 25 mmwere employed in this study.The WMAs were obtained by means of aliquid chemical solutionthat foamsthe asphalt binderAC 60-70 (PG 58-22).Aspects studied include strength under monotonic and dynamic loading. Additionally, a battery of tests wasperformed: Marshall, resilient modulus, permanent deformation and indirect tensile strength.The researchherein leads to the conclusion that theWMA chemical additive decreases mix temperatures by 30° C, which, in turn, translates intobettermixture workability and volumetric composition. Furthermore, WMAs display higher levels of resistance to high service temperaturesunder monotonic and dynamic loading.
Resumen (es)
La tecnología Warm Mix Asphalt (WMA) ofrece un amplio rango de potencial para usar en proyectos de construcción de carreteras. Aunque la principal ventaja de usar mezclas WMA es ambiental, también hay beneficios técnicos y económicos notables. Este artículo discute los resultados para la evaluación de laboratorio de mezclas de AM y su comparación posterior de asfaltos de mezcla en caliente (HMA). En este estudio, se emplearon mezclas de WMA y HMA de un tamaño nominal máximo de agregado de 25 mm. Las WMA se obtuvieron mediante una solución química alíquica que espumeja el aglutinante de asfaltoAC 60-70 (PG 58-22). Los aspectos estudiados incluyen la fuerza bajo carga monotónica y dinámica. Además, se realizó una batería de pruebas: Marshall, módulo elástico, deformación permanente y resistencia a la tracción indirecta. La investigación lleva a la conclusión de que el aditivo químico WMA disminuye las temperaturas de mezcla en 30 ° C, lo que a su vez se traduce en una menor trabajabilidad y composición volumétrica. Además, las WMA muestran mayores niveles de resistencia a altas temperaturas de servicio con carga monótona y dinámica.
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