surface from air and moisture, inhibit raveling, enrich hardened/oxidized asphalt, and provide pavement-shoulder delineation. Rejuvenators include a recycling agent and other additives; they soften and penetrate into the existing binder, thereby slowing the development of raveling, thermal cracking, and roughness. Asphalt emulsions used as rejuvenators typically include polymer latex and other additives, and can be used in fog seals, sand seals, scrub seals, or any other surface seal applied directly to the pavement surface. Figure 10-9. Fog seal application (photo courtesy WSDOT). Table 10-4 includes key characteristics and additional details related to treatment application, material selection, and construction requirements for fog seals/rejuvenators. 10-4. Key characteristics of fog seals/rejuvenators. Pavement Performance Conditions Addressed Contraindications Indicators Affected Functional/Other Structural failure. + Non-load-related transverse Longitudinal cracking Medium flushing/bleeding. and longitudinal cracking. Transverse cracking (minor). Medium/high friction loss. + Smoothness (potentially to Low and medium block High severity thermal the detriment of friction). cracking. cracking. Friction. Raveling/weathering. Extensive deterioration, little Asphalt aging, oxidation, and remaining life. hardening. Very dense pavement Moisture infiltration. surface. Segregation Pavement with poor surface friction. Structural Adds no structural benefit. Fog seal: 1 to 2 years. Expected Life Rejuvenators: 3 to 5 years.
surface from air and moisture, inhibit raveling, enrich hardened/oxidized asphalt, and provide pavement-shoulder delineation. Rejuvenators include a recycling agent and other additives; they soften and penetrate into the existing binder, thereby slowing the development of raveling, thermal cracking, and roughness. Asphalt emulsions used as rejuvenators typically include polymer latex and other additives, and can be used in fog seals, sand seals, scrub seals, or any other surface seal applied directly to the pavement surface. Figure 10-9. Fog seal application (photo courtesy WSDOT). Table 10-4 includes key characteristics and additional details related to treatment application, material selection, and construction requirements for fog seals/rejuvenators. 10-4. Key characteristics of fog seals/rejuvenators. Conditions Addressed Contraindications Pavement Performance Indicators Affected Functional/Other Longitudinal cracking Transverse cracking (minor). Low and medium block cracking. Raveling/weathering. Asphalt aging, oxidation, and hardening. Moisture infiltration. Segregation Structural Adds no structural benefit. Structural failure. Medium flushing/bleeding. Medium/high friction loss. High severity thermal cracking. Extensive deterioration, little remaining life. Very dense pavement surface. Pavement with poor surface friction. + Non-load-related transverse and longitudinal cracking. + Smoothness (potentially to the detriment of friction). Friction. Expected Life Fog seal: 1 to 2 years. Rejuvenators: 3 to 5 years.
10%20Pavement%20Preservation.docx