3501-19-c07 - Functions of a pavement: ASPHALT PAVEMENT...

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1 Functions of a pavement: 1. To provide a smooth and safe driving surface. 2. To protect the subgrade from frost action. 3. To protect the subgrade from permanent deformation. ASPHALT PAVEMENT STRUCTURE (or Friction Course) SEAL COAT - A thin surface treatment used to improve the textur e of and waterproof an asphalt surface. Seal coats may or may not be covered with aggregate. Examples: Fog Seal, Slurry Seal, Sand Seal. FRICTION COURSE – For high-speed road, such as Interstate highway, the surface is usually covered with a friction course (1/2 to ¾ inch thick) to improve the skid resistance of the pavement surface. TACK COAT - An application of asphalt to ensure bond between two asphalt layers. PRIME COAT - An application of low viscosity liquid asphalt on an untreated base. It penetrates into the base, plugs the voids and helps to bond it to the overlaying asphalt layer. Surface Course & Binder Course Usually an asphalt mixture Base – Usually of a granular material, such as crushed limestone. It can also be an asphalt mixture (i.e. an asphaltic base.) Subbase – Usually of a granular material.
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3501-19-c07 - Functions of a pavement: ASPHALT PAVEMENT...

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