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Evaluation of superpave mixtures containing hydrated lime : tech summary.
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    In the mid-1990s the Louisiana Department of Transportation and Development (LADOTD) revised its hot-mix asphalt (HMA) mixture specifi cations. Some of those major changes included requiring larger nominal maximum aggregate size in its aggregate structure and signifi cantly reducing the amount of fi ne aggregates used in HMA mixtures. Later, in 2003, LADOTD implemented the Superpave mixture design method. Mixtures under the Superpave system are encouraged to use coarse gradations that pass below the maximum density line, which eventually led to a reduction in the amount of fi ne aggregate materials from the aggregate structure. This lower fi ne aggregate content in combination with relatively high in-place air voids and high Voids in Mineral Aggregate resulted in Superpave mixtures with high permeability, less resistance to age hardening, and poor rut resistance. The addition of quality fi ller materials can be a possible solution to rutting, fatigue cracking, and moisture damage in asphalt concrete mixtures. This study evaluated the infl uence of hydrated lime on the fundamental engineering properties of HMA mixtures produced with the LADOTD Superpave specifi cations. In addition, the eff ects of the method (i.e., slurry or dry) in which hydrated lime was introduced to the HMA mixture were also evaluated.
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