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Influence of waxes on polymer modified mastic asphalt performance
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Highway and Railway Engineering (closed 20110301).
2010 (English)In: PROCEEDINGS OF THE 4TH EURASPHALT AND EUROBITUME CONGRESS, 2010, no Paper No. 401-014Conference paper (Refereed)
Abstract [en]

The use of wax additives in polymer modified coarse aggregate mastic asphalt in Europe is reviewed. Commercial wax such as FT-paraffin and montan wax are typical so-called bitumen flow improvers, which are used for asphalt pavements and mastic asphalt to reduce the mixing temperature and thereby energy consumption and emissions. Workability may be improved as well. These waxes differ a great deal from natural bitumen wax with respect to molecular weight and molecular weight distribution. They have high congealing points around 100degreesC and higher melting areas than natural wax in bitumen. Results are presented from an ongoing joint Swedish project about wax as flow improver in polymer modified bitumen for mastic asphalt production. Wax modification should not have any noticeable negative impact on the performance of mastic asphalt products at medium and lower temperatures. The project involves laboratory testing of wax and polymer modified binders and mastic asphalt mixtures, as well as field studies. Effects of adding two commercial waxes to one polymer modified bitumen are presented in this paper. The results show that both waxes have a flow improving/viscosity depressant impact on the polymer bitumen at higher temperatures, indicating a possible lower laying temperature for the mastic asphalt if modified with such waxes. Moreover, there is a stiffening effect at medium and high temperatures (below laying temperature), indicating a certain positive effect on stability. Concerning low temperature performance, there was a negative impact on crack susceptibility at low temperatures, which was larger with the addition of FT-paraffin than the addition of montan wax. For the covering abstract see ITRD E157233

Place, publisher, year, edition, pages
2010. no Paper No. 401-014
National Category
Infrastructure Engineering
URN: urn:nbn:se:kth:diva-88477OAI: diva2:502336
Eurasphalt & Eurobitume Congress. Copenhagen, Denmark. 21-23 May 2008
TSC import 1659 2012-02-14. QC 20120509Available from: 2012-02-14 Created: 2012-02-14 Last updated: 2012-05-09Bibliographically approved

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Edwards, Ylva
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