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Effectiveness of Fog Seals and Rejuvenators for Bituminous Pavement Surfaces
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1991-04-01
[PDF-3.32 MB]
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Edition:Final Report September 1987 to September 1990
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Abstract:Fog seals have been used for maintenance purposes in Texas with varying degrees of success for several years. A fog seal is a light application of slow-setting or medium-setting asphalt emulsion diluted with water. The principal reasons for using fog seals are: (I) to stop shelling on chip seals and surface treatments, (2) to reduce the rate of raveling and cracking on asphalt concrete pavements, and (3) to reduce the potential for air and water to enter into the pavement structure. Rejuvenators have been used to a limited degree in the state. The purpose of a rejuvenator is to penetrate somewhat into the asphalt concrete and soften (rejuvenate) the asphalt binder. It is also used to seal the pavement and minimize future oxidation. Application of fog seals and rejuvenators appears to be economically attractive. Many highway districts in Texas routinely use these products and techniques and believe they are cost effective. Information on the value of these treatments is not well documented; however, considering the widespread use of fog seals, it is obvious that a number of knowledgeable people feel that they have a significant economic value. The objective of this study was to determine the effectiveness of fog seals and rejuvenators at performing their intended functions and thereby evaluate the economic effectiveness of these maintenance treatments.
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