Performance Evaluation of Seal Coat Materials and Designs [Technical Summary]
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2011-01-01
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By Lee, Jusang
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Abstract:A seal coat is a durable and functional pavement surface treatment technique that requires minimal traffic disruption. Additional benefits include sealing the existing pavement’s surface cracks, providing a skid resistant surface, and preventing pavement surface damages from further aging or oxidation. Data and literature have suggested that seal coats constructed with high quality materials provide better initial and long-term performance and extend the overall service life of the pavement being treated. However, no research or data exist on quantifying the overall performance of different seal coat materials currently available in the Indiana seal coat industry. Evaluating the performances of seal coat materials and updating/expanding standard specifications based on their performance is needed in order to provide proper guidelines to the pavement maintenance engineers in each district. Furthermore, introducing new and better performance materials from other states to Indiana, considering life cycle cost, can expand current seal coat material selection. Although typical aggregate and asphalt application rates are available in specifications such as ASTM D1369-84 and INDOT standard specifications (Chapter 404), design method, and guidelines are still needed to compute an optimum seal coat application rate for specific aggregate, emulsion, and pavement condition on a project-specific basis. The primary objectives of this research are: 1) To evaluate seal coat performance of various combinations of aggregates and emulsions in terms of aggregate loss; 2) To evaluate how each of the properties of theses aggregates and emulsions affect seal coat performance; 3) To evaluate current seal coat design methods based on INDOT seal coat practice; and 4) To develop a seal coat design program incorporating Indiana practice.
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