Durable Asphalt Emulsion Seal Coats Volume I: Research Report
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1989-10-01
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Edition:Final Report
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Abstract:This report documents an investigation of seal coats, primarily chip seals. The study included a literature review, discussions with pavement technologists, interviews of State highway departments, and laboratory and field evaluations of selected projects. Significant findings and recommendations are as follows: • Construction factors are extremely important. Increasing awareness, knowledge and experience in this area should lead to fewer premature failures. • Design methods vary and result in significantly different material quantities. Many agencies rely on rates based on historical data and experience. • Performance measures, failure criteria, or factors affecting performance of chip seals are not significantly different between climatic regions. • Emulsion and residual asphalt viscosity should be directly considered in design, in specifications, and during construction. Emulsion viscosity can decrease substantially from production to time of construction. • Statistically planned, controlled field projects which focus on isolated parameters are recommended for further research. Other available documents are: volume II (Report No. FHWA-RD-89-231) -- appendixes to volume I; volume Ill (Report No. FHWA-RD-89-237) -- a users manual which outlines the factors that should be considered when designing and constructing a chip seal project.
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