EFECTO DE LA FOTO-DEGRADACIÓN EN LA MICROESTRUCTURA Y COMPOSICIÓN QUÍMICA DEL ASFALTO

Adriana Gamarra E.; E. Alexander Ossa

doi:10.17533/udea.rcm.19409

Authors

Adriana Gamarra E. Eafit University
E. Alexander Ossa EAFIT University

DOI:

https://doi.org/10.17533/udea.rcm.19409

Keywords:

Radiation, Ageing, Photo-oxidation, Bitumen, Microestructure

Abstract

This work studies the effect of photo-oxidation on bitumen ageing. Bitumen is a complex mixture of hydrocarbons, and heteroatoms within heavy metals. The organic compounds are affected by environmental conditions, undergoing degradation, which results in a reduction of properties. The effect of environmental conditions in bitumen had been studied for years, finding that the main mechanisms that deteriorate their properties are: thermo-oxidation, photo-oxidation and volatilization; the oxygen action, temperature, solar radiation and time being the reasons behind this damage. However, although those mechanisms are recognized, the specific photo-degradation mechanism is not well known yet. In this work, Colombian bitumen samples were exposed in a chamber with xenon light during different time periods in order to evaluate the chemical changes by infrared spectroscopy by Fourier transformer (FTIR) and microestructural characteristics by topographic analysis using atomic force microscopy (AFM) finding a relation between

exposure time and chemical and microestructural changes on the material.

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Author Biographies

Adriana Gamarra E., Eafit University

Master's Degree Student in Engineering, Engineering Materials Research Group, Eafit University, Medellín, Colombia.

E. Alexander Ossa, EAFIT University

Associate Professor, Engineering Materials Research Group, Eafit University, Medellín, Colombia.

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