Journal of the Brazilian Chemical Society
Print version ISSN 0103-5053
MOTTA, Rosângela et al. Comparison of the n-alkanes and polycyclic aromatic hydrocarbons concentrations in the atmosphere during the preparation of warm and hot mixtures asphalt for pavements. J. Braz. Chem. Soc. [online]. 2012, vol.23, n.8, pp. 1501-1505. Epub Aug 09, 2012. ISSN 0103-5053. http://dx.doi.org/10.1590/S0103-50532012005000011.
Asphalt binder is used in the production of hot mixes asphalt (HMA) for paving and, due to the high temperatures used, generates fumes thatcontainn-alkanes and polycyclic aromatic hydrocarbons (PAH). Asphalt mixes prepared at lower temperatures, such as warm mixes asphalt (WMA), may contribute to reduce the emissions of those compounds and save energy. This paper investigatesn-alkanes and PAH in the total suspended particles during the preparation of WMA, in comparison with HMA, in laboratory. The results showed that the n-alkanes of the WMA and HMA presented Cmax at n-C26 and n-C28, respectively; also, the total content of n-alkanes was higher for the HMA than forthe WMA. Besides, benzo[b]fluoranthene and benzo[a]anthracene were the major PAH in the WMA, while the higher temperatures of the HMA were observed to volatilize all larger PAH, demonstrating higher potential of inhalation exposure.
Keywords : warm mix asphalt; hot mix asphalt; PAH; n-alkanes.