Field density investigation of asphalt mixtures in minnesota

Tianhao Yan, Mihai Marasteanu, Chelsea Bennett, John Garrity

Research output: Chapter in Book/Report/Conference proceedingChapter

4 Scopus citations


In a current research effort, University of Minnesota and Minnesota Department of Transportation have been working on designing asphalt mixtures that can be constructed at 5% air voids, similar to the Superpave 5 mix design. High field density of asphalt mixtures is desired because it increases the durability and extends the service life of asphalt pavements. The paper investigates the current situation of field densities in Minnesota, to better understand how much improvement is needed from the current field density level to the desired level, and to identify possible changes to the current mix design to improve field compactability. Field densities and material properties of 15 recently constructed projects in Minnesota are investigated. First, a statistical analysis is performed to study the probability distribution of field densities. Then, a two-way analysis of variance is conducted to check if the nominal maximum aggregate size and traffic levels have any significant effect on field densities. A correlation analysis is then conducted to identify significant correlations between the compactability of mixtures and their material properties. The results show that the field density data approximately obey normal distribution, with an average field density of 93.4% of theoretical maximum specific gravity; there are significant differences in field density between mixtures with different traffic levels; compactability of mixtures is significantly correlated with fine aggregate angularity and fine aggregate gradation of the mixtures.

Original languageEnglish (US)
Title of host publicationTransportation Research Record
PublisherSage Publications Ltd
Number of pages11
StatePublished - 2021

Publication series

NameTransportation Research Record: Journal of the Transportation Research Board
ISSN (Print)0361-1981

Bibliographical note

Funding Information:
The authors gratefully acknowledge Minnesota Department of Transportation (MnDOT) for providing financial support, and materials and data collection. The authors also acknowledge the input provided by Gerry Huber, and by Dr Reyhaneh Rahbar-Rastegar, and Dr Ervin Dukatz during this investigation.

Funding Information:
The author(s) received the following financial support for the research, authorship, and/or publication of this article: Minnesota Department of Transportation (grant number 1003325 WO#106).

Publisher Copyright:
© National Academy of Sciences: Transportation Research Board 2021.


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