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Investigation of Porous Asphalt Microstructure using Optical and Electron Microscopy
Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for Road Engineering/Sealing Components, Dübendorf, Switzerland.
2010 (English)In: Journal of Microscopy, ISSN 0022-2720, E-ISSN 1365-2818, Vol. 240, no 2, 145-154 p.Article in journal (Refereed) Published
Abstract [en]

P>Direct observations of porous asphalt concrete samples in their natural state using optical and electron microscopy techniques led to useful information regarding the microstructure of two mixes and indicated a relationship between microstructure and in situ performance. This paper presents evidence that suboptimal microstructure can lead to premature failure thus making a first step in defining well or suboptimal performing pavements with a bottom-up approach (microstructure). Laboratory and field compaction produce different samples in terms of the microstructure. Laboratory compaction using the gyratory method has produced more microcracks in mineral aggregates after the binder had cooled. Well-performing mixes used polymer-modified binders, had a more homogeneous void structure with fewer elongated voids and better interlocking of the aggregates. Furthermore, well-performing mixes showed better distribution of the mastic and better coverage of the aggregates with bitumen. Low vacuum scanning electron microscopy showed that styrene butadiene styrene polymer modification in binder exists in the form of discontinuous globules and not continuous networks. A reduction in the polymer phase was observed as a result of aging and in-service use.

Place, publisher, year, edition, pages
2010. Vol. 240, no 2, 145-154 p.
Keyword [en]
Electron microscopy, ESEM, microstructure, optical microscopy, porous asphalt concrete
National Category
Infrastructure Engineering
Identifiers
URN: urn:nbn:se:kth:diva-88825DOI: 10.1111/j.1365-2818.2010.03388.xISI: 000282814500007OAI: oai:DiVA.org:kth-88825DiVA: diva2:502457
Note
TSC import 1877 2012-02-14. QC 20120305Available from: 2012-02-14 Created: 2012-02-14 Last updated: 2017-12-07Bibliographically approved

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