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Studying asphalt binder fatigue pattern by using a dynamic shear rheometer
Estudio del comportamiento a fatiga de asfaltos mediante el uso del reómetro de corte dinámico
DOI:
https://doi.org/10.15446/ing.investig.v31n1.20520Keywords:
fatigue, asphalts binder, DSR, dissipated energy, strain failure. (en)fatiga, asfaltos, DSR, energía disipada y deformación de rotura. (es)
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This article was aimed at determining fatigue test results regarding different types of binder when using a dynamic shear rheometer (DSR). The tests were carried out in stress conditions at 20°C. The stress input signal was a constant amplitude, 1.59 Hz frequency sine wave. Asphalt binders B-13/22, B-40/50, B-60/70, B-80/00, B-150/200 and BM-3c (modified asphalt) were studied. The test measured strain, complex modulus (G*), dissipated energy and dissipated energy ratio (DER) with the number of cycles. Strain criteria were used for determining binder fatigue failure (DER). Failure was defined as the point at which (DER) dropped 10% after peaking. Laws of asphalt fatigue were obtained from the strain and failure cycle results.
El objetivo principal del artículo fue el de determinar el comportamiento a fatiga de diferentes tipos de asfaltos a partir de ensayos en el reómetro de corte dinámico (DSR). Los ensayos en el DSR se realizaron a un esfuerzo senosoidal de amplitud constante, a una frecuencia de 1,59 Hz y a 20 °C. Los asfaltos estudiados fueron B-13/22, B-40/50, B-60/70, B-80/00, B-150/200 y un BM-3c (asfalto modificado). Durante los ensayos se midió la evolución de la deformación, el módulo complejo, el ángulo de desfase, la energía disipada y la ratio de energía disipada con los ciclos de carga, parámetros para determinar el ciclo de fallo por fatiga de los asfaltos. En primer lugar se estableció en las curvas de evolución de la deformación con los ciclos de carga el rango de deformación de rotura, zona donde la evolución de la deformación crece en forma súbita y se presenta el fallo por fatiga. Luego del análisis del ratio de energía disipada (DER) y de la evolución de la deformación con los ciclos de carga, se determinó el ciclo donde se produce el fallo. Del estudio se obtuvo un nuevo criterio de fallo de fatiga, consistente en calcular la fatiga del asfalto cuando alcanza un valor de 10% pasado el valor máximo de la curva de ratio de energía disipada. Por último, se obtuvieron las leyes de fatiga de los asfaltos con los resultados de deformación de rotura y ciclo de fallo.
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Copyright (c) 2011 Oscar Javier Reyes Ortiz, Félix Eduardo Pérez Jiménez
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