>Dear all,
>
>In a former request about extraction I have asked the wrong question. The
>main problem was not the lack of enough material but the inefficient use of
>the automatic extraction equipment (Asphalt Analyzer 200; Infratest)
>followed by a vacuum rotating evaporation treatment. . Here's the correct
>request:
>
>In our research program on porous asphalt wearing courses (ZOAB; drainage
>asphalt) we want to investigate the mix properties of very thin layers
>(<3cm; top layer of a ZOAB twin-layer). In that case you obtain per core a
>rather small amount of asphalt. Traditional soxhlet equipment is not wanted
>because heating will change the bitumen properties. The automatic {cold}
>equipment of Infratest is in principal meant for large amount of materials.
>Using this equipment for just a small sample would mean to waste a lot of
>solvent. So, we are looking for extraction equipment designed for small
>samples of materials. Maybe a small soxhlet equipment with a modified
>solvent for a cold treatment might be good, but we don't have info on this
>item. If anyone of you know extraction equipment designed for dealing with
>small samples without heating of the material please let me know.
>
>Related to this problem is how to measure in a qualitative and quantitative
>way the presence of modified bitumen in small samples. At the moment we use
>GPC and IR techniques but there might be better solutions. Also info on an
>IR application with liquids is welcome.
>
>Thanks in advance
>Ad Pronk
>FEHRL Res. Coord. NL
>Road & Hydraulic Eng. Div.
>Rijkswaterstaat
>The Netherlands
>[log in to unmask] <mailto:[log in to unmask]>
>
>
>
>Disclaimer
>************************************************************************
>Aan dit bericht kunnen geen rechten worden ontleend.
>Dit bericht is uitsluitend bestemd voor de geadresseerde.
>Als u dit bericht per abuis hebt ontvangen, wordt u verzocht het te
>vernietigen en de afzender te informeren.
>Wij adviseren u om bij twijfel over de juistheid of de volledigheid van
>de mail contact met afzender op te nemen.
>************************************************************************
|