Reducing the Short-Term Aging of Asphalt with Hydrated Lime
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The environment which the pavement must serve is in continuous change which induces a significant impact on pavement performance. Consequently, highway engineers are constantly looking for new materials and methods to optimize rheological properties of asphalt. Recent researches have shown multiple advantages of the use of hydrated lime as modifier that could enhance performance of asphalt concrete. In the present survey and in recognition of the importance of the binder, the hydrated lime is directly added to the asphalt binder unlike most of earlier researches where the hydrated lime was added to the aggregates. The paper is composed of three parts: the first part includes a literature review on asphalt aging and the beneficial effect of lime addition to HMA mixtures. The second part describes rheological properties of two types of asphalt used in this study and analyzes the influence of short-term aging on each type of asphalt. The last part presents a comparison of properties obtained for both cases of non-modified asphalt and lime-modified asphalt both subjected to short-term aging. Results show a significant improvement of the resistance to short-term aging and better adhesion properties of the lime-modified asphalt.
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