Fast and sensitive method to detect tar in reclaimed asphalt

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Core Tasks (1)

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This research project subsidized by the FPS Economy, SMEs, Self-Employed and Energy was completed in two periods of two years.

During the first period (1st July 2002 through 30th June 2004) a series of methods was investigated for the qualitative and quantitative determination of groups of pollutants such as tar, pitch and tar oils in tar-containing or tar-free crushed reclaimed asphalt (RA). This involved both the evaluation of existing methods such as Fourier transformation infrared spectroscopy (FT-IR), PAK-Marker®, paper chromatography, sublimation test, etc. and the development of new techniques such as selective extraction of polyaromatic hydrocarbons (PAHs) followed by specific spectroscopic detection. Both the advantages and disadvantages and the sensitivity of each method were considered in this evaluation, in the light of the requirements made in the VLAREA legislation for the composition of tar-containing crushed RA.

During the second period of the project the applicability of a field measurement technique using a portable UV spectrophotometer was evaluated. In this process much attention was given to the validation of performance characteristics in both qualitative and quantitative interpretations of results of measurements (measuring range, detection limit, etc.). The test results were also compared with the results of GC-MS-analyses. Additionally, specific consideration was given to the influence of sampling on the results of analyses.

The results of the research were summarized in two final reports. They were also presented in detail in a few publications.

Vansteenkiste S., De Bock L, Verhasselt A.
Méthode de détection rapide et sensible du goudron dans les enrobés à recycler.
Bulletin CRR 55, pp. 2-6, 2003.

Vansteenkiste S., Verhasselt A.
The development of field methods for a rapid and sensitive screening of tar in recycled asphalt pavement.
3rd Eurasphalt & Eurobitume Congress, Book I – pp.1117-1127. Vienna (Austria), May 12-14, 2004.

Vansteenkiste S., Verhasselt A.
Comparative study of rapid and sensitive screening methods for tar in recycled asphalt pavement.
Road Materials and Pavement Design, vol 5 special issue, pp. 89-106, 2004.

Vansteenkiste S., Verhasselt A.
Snelle en gevoelige detectiemethode voor teer in te recyclen asfalt.
XXste Belgisch Wegencongres, Brussel (België), 28-30 september 2005.