Abstract

REYES, Fredy Alberto; DAZA, Carlos Enrique  and  RONDON, Hugo Alexánder. DETERMINATION OF SARA FRACTIONS OF ENVIRONMENTALLY AGED COLOMBIAN ASPHALTS USING LIQUID CHROMATOGRAPHY COLUMN. Rev.EIA.Esc.Ing.Antioq [online]. 2012, n.17, pp.47-56. ISSN 1794-1237.

In this paper, we present a method based on liquid chromatography column to quantify the chemical composition of asphalt cements manufactured in Colombia, under the environment by determining the SARA fractions. The method was applied to thin layers of asphalt 60/70 and 80/100 to determine changes in the chemical composition of the material after exposure for 12 months in the weather conditions in the city of Bogotá; SARA tests were performed to the original asphalt, 1, 3, 6, 9 and 12 months aged respectively. SARA trials showed that aging caused a decrease in the fraction of aromatics and asphaltenes increased compared to non-aged asphalt. The reduction of aromatics and resins could be responsible for the hardening observed in the asphalt, which had a stiff and brittle consistency; that leads to obtaining higher colloidal index. The performed method established possible correlations between the chemical composition of asphalt and its mechanical properties.

Keywords : asphalt cement; asphalt concrete; SARA; aging; chemical behavior; loss of chemical compounds.

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