A performance comparison of asphalt mixtures modified with hydrated lime, polymer modified binder and reclaimed asphalt shingles (RAS) on Route 50 Moniteau, Morgan and Pettis counties.

PDFTech Reportcmr 13-011Asphalt mixturesCalcium hydroxideBindersWaste productsPavement performanceMix designHot mix paving mixturesAggregate mixturesOverlays (Pavements)Stripping (Pavements)MissouriMissouri. Dept. of Transportation. Division of Construction and MaterialsSchroer, JoeMissouri. Dept. of TransportationUS Transportation CollectionHydrated lime was required in high traffic asphalt mixtures controlled by Section 403 of the Missouri Standard Specifications for Highway Construction from the late 1980\ue2\u20ac\u2122s through much of the 1990\ue2\u20ac\u2122s primarily as an anti-stripping agent but also for some initial stiffness and stability in mixtures during placement. With the advent of the Superpave mix design system and volumetric field control of HMA, contractors began to complain that the hydrated lime requirement added dust to their mixtures that made it more challenging to meet volumetric requirements in the field without adding harder, more durable, (in other words, more expensive) aggregate. Sources for these aggregates are not as wide spread and many times cost more and require hauling more than 100 miles. For roughly the same cost in the mixture, they could use liquid anti-stripping agents but save money by using more aggregate local to the project. It was agreed to allow contractors to choose liquid anti-stripping agents or hydrated lime. Rather quickly, hydrated lime use became limited amongst contractors