AASHTO R5-17 pdf free download
AASHTO R5-17 pdf free download.Selection and Use of Emulsified Asphalts.
3.2.2. chip seal—a surface treatment in which a pavement surface is sprayed with asphalt (generally emulsified) and then immediately covered with aggregate and rolled. Chip seals are used primarily to seal the surface of a pavement with non-load-associated cracks and to improve surface friction, although they also are commonly used as a wearing course on low-volume roads.
3.2.3. crackfihling—the placement of materials into non-working cracks to substantially reduce infiltration of water. Non-working cracks are defined as those that experience minor horizontal movements, generally less than 2 mm (0.1 in.). Crack filling should be distinguished from crack sealing.
3.2.4. crack sealing—a maintenance procedure that involves placement of specialized materials into working cracks using unique configurations to reduce the intrusion of incompressible materials into the crack and to prevent intrusion of water into the underlying pavement layers. Working cracks are defined as those that experience significant horizontal movements, generally greater than about 2 mm (0.1 in.).
3.2.5. dense-graded asphalt overlav—an overlay course consisting of a mix of asphalt binder and a well- graded (also called dense-graded) aggregate. A well-graded aggregate is uniformly distributed throughout the full range of sieve sizes.
3.2.6. jig sea/—a light application of slow-setting emulsified asphalt diluted with water is commonly used, although other types of emulsified asphalt may be used. It is used to renew old asphalt surfaces and to seal small cracks and surface voids.
3.2.7. micro surfacing—a mixture of polymer-modified emulsified asphalt, mineral aggregate, mineral filler, water, and other additives; properly proportioned, mixed, and spread on a roadway surface.
3.2.8. sand seal—an application of asphalt material covered with tine aggregate. It may be used to improve the skid resistance of slippery pavements and to seal against air and water intrusion.
3.2.9. santhvjch seal—a surface treatment that consists of an application of a large aggregate, followed by an application of emulsified asphalt that is in turn covered with an application of smaller aggregate. Sandwich seals are used to seal the surface and improve skid resistance.
3.2.10. scrub seal—application of a emulsified asphalt to the pavement surface followed by the broom scrubbing of the asphalt into cracks and voids, then the application of an even coat of sand or small aggregate, and finally a second brooming of the aggregate and asphalt mixture. This seal is then rolled with a pneumatic tire roller.
3.2.11. slurry seal—a mixture of slow-setting emulsified asphalt, well-graded fine aggregate, mineral filler, and water. It is used to fill cracks and seal areas of old pavements, to restore a uniform surface texture, to seal the surface to prevent moisture and air intrusion into the pavement, and to provide skid resistance.
4. SIGNIFICANCE AND USE
4.1. Emulsified asphalts are mixtures of asphalt hinders, water, and emulsifying agents. They may contain other additives to meet certain grades. Emulsified asphalt grades and types have different uses.
4.2. Emulsified asphalts are named using a prefix and a suffix. The prefix identifies the type and class of emulsified asphalt and the suffix identifies the grade.AASHTO R5-17 pdf download.
