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Enrichment of fine mica originating from rock aggregate production and its influence on the mechanical properties of bituminous mixtures
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
2004 (English)In: Journal of materials engineering and performance (Print), ISSN 1059-9495, E-ISSN 1544-1024, Vol. 13, no 5, p. 607-611Article in journal (Refereed) Published
Abstract [en]

Analyses of mica-bearing, crushed granitoid rocks revealed a significant enrichment of free mica in the fine fraction. Qualitative tests of bituminous mixtures with an increasing content of free mica in the fine fraction suggested a considerable deterioration of the mechanical properties of the asphalt mass. The negative influence of fine mica on the mechanical properties of the asphalt mixtures was most likely caused by the ability of mica to adsorb bitumen and to create zones of weakness. This phenomenon seemed to be linked to a preferred orientation (foliation) of the mica particles that was connected to the compaction of asphalt masses during the construction of the surface course. The threshold content at which the fine mica negatively influenced the quality of the bituminous mixtures was estimated to be 30-35 vol.%.

Place, publisher, year, edition, pages
2004. Vol. 13, no 5, p. 607-611
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-6982DOI: 10.1361/15477020420837Local ID: 54fa3e20-560a-11dc-a7ae-000ea68e967bOAI: oai:DiVA.org:ltu-6982DiVA: diva2:979868
Note
Validerad; 2004; 20070829 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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