Performance of Exposed Aggregate Surface of Composite Pavements at MnROAD

    Published: Nov 2012

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    This paper summarizes the construction and early performance assessment of an exposed aggregate surface on a composite pavement test cell (cell 72) at MnROAD. Although exposed aggregate surfaces and composite pavement systems have become extremely popular in Europe, they are a relatively new concept in the United States. The performance of the exposed aggregate surface is compared to that in the two other composite pavement cells at MnROAD: cell 70, hot mix asphalt (HMA) over a recycled aggregate concrete, and cell 71, diamond grind concrete over recycled aggregate concrete. The strength, tire pavement noise (on board sound intensity), sound absorption, friction, texture, and international roughness index were tested. The results suggest that the exposed aggregate concrete surface does not provide significant noise reduction. Innovative diamond grinding of composite pavements might be beneficial for noise reduction. Exposed aggregate surfacing can provide more than adequate friction for driver safety, but it does not show any improvement relative to typical HMA or diamond ground surfaces. Exposed aggregate surfaces have a texture (or mean profile depth) similar to that of traditional diamond ground surfaces but might be detrimental to the ride quality. Continued monitoring of these test cells will aid the development of a wide understanding of exposed aggregate surfaces and composite pavements needed for more effective design and accurate service life models.


    exposed aggregate surfaces, composite pavements, tire pavement interaction noise, sound absorption, ride quality

    Author Information:

    Izevbekhai, Bernard
    Minnesota Dept. of Transportation, Office of Materials and Road Research, Maplewood, MN

    Akkari, Alexandra
    Minnesota Dept. of Transportation, Office of Materials and Road Research, Maplewood, MN

    Committee/Subcommittee: E17.42

    DOI: 10.1520/STP104436

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