Investigation of Hydrated Lime Effect in Asphalt Pavements

Abstract

Hydrated lime (HL) has been added to hot mix asphalt pavements over the years to improve the asphalt concrete mixtures in many ways. Although it has been repeatedly shown that the use of hydrated lime in asphalt concrete mixtures is beneficial, confusion still exists about the appropriate methods of adding hydrated lime to the mixtures to achieve the optimum modification of hydrated lime. The reasons why hydrated lime is so effective in asphalt mixtures lie in the strong interactions between the major components such as aggregate and bitumen. In this study, effects of hydrated lime in the asphalt pavements are investigated by performing Marshall Stability test, indirect tensile strength test, moisture susceptibility test and resilient modulus test. It can be concluded that, the addition of hydrated lime generally improved the fatigue properties of the asphalt mixture regardless the method of application to the mixtures. Asphalt mixtures modified with hydrated lime using wet method showed better properties as compared to mixtures modified with hydrated lime using dry or slurry methods. Overall description aids that the wet method is better than dry or slurry methods despite the little effect on Marshall, Moisture Suscepility test results when comparing all the test results and seems to provide better performance for pavement.

Keywords

• Asphalt mixtures, Hydrated lime, Marshall test, Indirect tensile test, Resilient modulus test, Moisture susceptibility

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