Influence of foaming water content on foam asphalt mixtures
2015 (English)In: Construction and Building Materials, ISSN 0950-0618, Vol. 85, 65-77 p.Article in journal (Refereed) Published
Warm mix asphalt technology using foamed bitumen is being used widely despite the fact that high air void content and poor coating of large aggregate remain major drawbacks require enhancement. This paper manly focuses on the investigation of water content influence on the foamed bitumen and the asphalt mixture. Influence of the water content in combination with compaction temperature has been investigated using gyratory compaction method. AC11N foam asphalt mixture is produced in the lab using lab foamer. Marshall stability and indirect tensile test was used to evaluate the foam asphalt mixture performance. The investigation revealed that the Marshall stability of foam asphalt mixture is highly influenced by compaction temperature compared to water content. Moreover, increasing the water content helps in coating large aggregates when the mixture is produced at low temperature, nevertheless using high water content reduces the Marshall stability to certain extent. In addition the amount of water trapped in the mixture after the mixing process was determined using thermogravimetric analysis. The amount of water remaining in the asphalt mixture is less than 1% relative to the bitumen mass.
Place, publisher, year, edition, pages
2015. Vol. 85, 65-77 p.
Foamed bitumen, Water content, Asphalt mixture, Laboratory tests, Thermogravimetric analysis
IdentifiersURN: urn:nbn:se:kth:diva-169242DOI: 10.1016/j.conbuildmat.2015.03.071ISI: 000354139400008OAI: oai:DiVA.org:kth-169242DiVA: diva2:822040
QC 201506162015-06-162015-06-122016-03-03Bibliographically approved