Toward understanding breaking and coalescence of bitumen emulsions for cold asphalts
2016 (English)Conference paper (Other academic)
Cold mix asphalt (CMA) emulsion based technology is a potential option to replace traditional hot mix asphalt due to environmental benefits and less energy consumption of producing it. However, there are some issues concerned with CMA, for instance, pre-mature coalescence of bitumen emulsions while mixing with minerals or aggregates, which might need more attention to improve the performance of CMA. Actually, the adhesion between the binder and the aggregate surface is largely dependent on the breaking process of bitumen emulsions and the water push-out from the mixtures. This breaking process helps to predict the materials behavior as well as the long term mechanical performance of the mixtures; however, the exact nature of the breaking mechanism of bitumen emulsion is not completely understood until today. The objective of this research is to develop understanding of the structural changes during the phase separation and coagulation stages of the bitumen emulsion. Wettability of bitumen was analyzed by changing the substrate climate conditions. Moreover, this study was extended with the addition of emulsifier and other additives to the binder itself as well as to the water phase. Similar kinds of experiments were setup for exploring the coalescence of bitumen drops in water and emulsifier with other additives.
Place, publisher, year, edition, pages
2016. 1-13 p., 402
Cold Mix Asphalts, Bitumen Emulsions, Coalescence, Breaking Mechanism, Wettability, Surface Free Energy.
Research subject Transport Science
IdentifiersURN: urn:nbn:se:kth:diva-191534OAI: oai:DiVA.org:kth-191534DiVA: diva2:957249
6th Euroasphalt & Eurobitume Congress, Czech Republic, June 1-3, 2016
QC 201609022016-09-012016-09-012016-09-02Bibliographically approved