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The quantification of polymer content in modified asphalt cement (AC) is very important in paving materials, being a questioned item on road construction auditing. One of the polymers most used in paving materials is styrene and butadiene copolymer (SBS). The quantification of polymers by Fourier Transform Infrared (FTIR) spectrometry is a fast procedure compared to techniques like Nuclear Magnetic Resonance (NMR) and Gel Permeation Chromatography (GPC), also used for this purpose. This work aim establishes a quantification methodology of SBS content in AC using FTIR. Calibration curves were constructed from standard mixtures prepared at 1, 3, 4, 5, 8 and 15% (w/w) of powder SBS and AC 50/70. Results of this investigation indicated a linear relationship between polymer content in polymer modified asphalt samples and the absorbances of 966 and 698 cm. It was also observed, by FTIR spectra and chemometrics tools, as indicated by the concentration study, as the polymer concentration in asphalt increased, the intensity of the 966 and 698 cm absorption bands increased. These bands are assigned to polybutadiene and polystyrene, respectively. This method showed good results when was tested with laboratory mixtures of AC-SBS samples, however, for an extracted samples AC-SBS from pavements, showed bad results.

Estudo de Metodologia para Quantificação do Polímero SBS no Asfalto Utilizando a Espectrometria de Infravermelho por Transformada de Fourier