A method was developed to identify unstable mixes with the help of Superpave gyratory data. The basis of this method is that the primary difference in behavior of a stable mix and an unstable mix is that a stable mix gains in strength with densification and retains it through further compaction and ultimately resists lowering of voids below a particular value, whereas an unstable mix initially gains in strength but loses it beyond a certain densification point and becomes susceptible to shear failure. Hence it is proposed that the strength of a mix be evaluated at two void levels: at 5 percent, where a mix is expected to have an increased shear strength compared with postconstruction voids, and at 2 percent, where a well-performing mix should have an increased or at least similar shear strength compared with shear strength at 5 percent, and where an unstable mix is expected to have a reduced shear strength compared with shear strength at 5 percent voids. U.S. Army Corps of Engineers and Superpave gyratory compaction data were obtained for five mixes from wearing courses, and the data were evaluated with the help of in-place rutting data. The gyratory ratio, a ratio of the number of gyrations required to achieve 2 percent voids and 5 percent voids, was found to be suitable for characterizing hot-mix asphalt. Theoretical calculations and in-place rutting data show that a gyratory ratio of 4 can be used to differentiate between stable and unstable mixes—mixes with a gyratory ratio less than 4 can be expected to be unstable.


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    Title :

    Use of Superpave Gyratory Compactor To Characterize Hot-Mix Asphalt


    Additional title:

    Transportation Research Record: Journal of the Transportation Research Board


    Contributors:


    Publication date :

    1999-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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