Influence of subgrade and unbound granular layers stiffness on fatigue life of hot mix asphalts - hma

  • Hugo A. Rondón-Quintana Universidad Distrital Francisco José de Caldas, Bogotá
  • Wilmar D. Fernández-Gómez Universidad Distrital Francisco José de Caldas, Bogotá
  • Jesús A. Hernández-Noguera Universidad Nacional Autónoma de México - UNAM, Ciudad de México
Keywords: Fatigue, asphalt mixtures, unbound granular layers, subgrade, flexible pavement.

Abstract

The mainly factors studied to predict fatigue life of hot mix asphalt-HMA in flexible pavements are the loading effect, type of test, compaction methods, design parameters of HMA (e.g., particle size and size distribution curve, fine content, type of bitumen) and the variables associated with the environment (mainly moisture, temperature, aging). This study evaluated through a computer simulation, the influence of the granular layers and subgrade on the fatigue life of asphalt layers in flexible pavement structures. Mechanics parameters of granular layers of subgrade, base and subbase were obtained using the mathematical equations currently used for this purpose in the world. The emphasis of the study was the city of Bogotá, where the average annual temperature is 14°C and soils predominantly clay, generally experience CBR magnitudes between 1% and 4%. General conclusion: stiffness of the granular layers and subgrade significantly affect the fatigue resistance of HMA mixtures. Likewise, the use of different equations reported in reference literature in order to characterize granular layers may vary the fatigue life between 4.6 and 48.5 times, varying the thickness of the pavement layers in the design.

Author Biographies

Hugo A. Rondón-Quintana, Universidad Distrital Francisco José de Caldas, Bogotá
Doctor en Ingeniería, Facultad del Medio Ambiente y Recursos Naturales, Universidad Distrital Francisco José de Caldas, Bogotá
Wilmar D. Fernández-Gómez, Universidad Distrital Francisco José de Caldas, Bogotá
Doctor en Ingeniería, Facultad del Medio Ambiente y Recursos Naturales, Universidad Distrital Francisco José de Caldas, Bogotá
Jesús A. Hernández-Noguera, Universidad Nacional Autónoma de México - UNAM, Ciudad de México
Doctor en Gestión del Territorio e Infraestructuras del Transporte, Instituto de Ingeniería,
Universidad Nacional Autónoma de México - UNAM, Ciudad de México
How to Cite
Rondón-Quintana, H. A., Fernández-Gómez, W. D., & Hernández-Noguera, J. A. (2011). Influence of subgrade and unbound granular layers stiffness on fatigue life of hot mix asphalts - hma. TecnoLógicas, (31), 53-72. https://doi.org/10.22430/22565337.101

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Published
2011-11-30
Section
Research Papers