United States Department of Transportation
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Evaluation of the fundamental engineering properties of bituminous mixtures containing hydrated lime.
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2002-04-01
[PDF-9.13 MB]
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Abstract:The increasing volume of truck traffic combined with the hot and moist climate of Louisiana are the major contributing factors to severe pavement distresses. Permanent deformation and moisture damage are the most common distresses of Louisiana pavements, resulting in the rutting and stripping of the asphaltic concrete. The use of hydrated lime decreases moisture susceptibility and increases mixture stiffness.
In this study, conventional asphaltic concrete mixtures and mixtures modified with hydrated lime were evaluated for their fundamental engineering properties as defined by indirect tensile strength and strain, permanent deformation characteristics, resilient modulus, and fatigue resistance.
A dense graded mixture meeting the Louisiana Department of Transportation and Development Type 3 specification (low stability, low volume < 2500 ADT) was used. The test factorial included two aggregate types, limestone and gravel, and two asphalt cement types, a conventional AC-30 and a polymer modified PAC-40HG. Hydrated lime was used as the mineral filler.
The results indicated that the addition of hydrated lime as mineral filler improved the permanent deformation characteristics and fatigue endurance of the asphaltic concrete mixtures. This improvement was particularly apparent at higher testing temperatures in mixtures with or without polymer modified asphalt.
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