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Asphalt Paving Materials 2-1 Chapter 2 Asphalt and Asphalt Paving Materials ASPHALT DEFINED The black cementing agent known as asphalt has been used for road construction for centuries. Although there are natural deposits of asphalt, or rock asphalt, most used today is produced by the oil refining industry. Asphalt is a constituent of most ...
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Which Asphalt Grade Should You Use? Selecting the right asphalt for your project is vital to ensure its longevity. Here are the most common asphalt grades and their application. I-2 Stabilized Base. I-2 (Stabilized Base or Stab Base) refers to the base layer of a pavement which provides it with a durable and strong foundation.
Achieving finish grades is typically made possible by finish grade stakes placed by the surveyor. On the stake will be a cut or fill notation and an indicator showing where the final grade should be, allowing the contractor to subtract the depth of the pavement material to …
intrusion of air and water, primarily water. The more asphalt binder that is sprayed onto the pavement, the better seal it will provide. Larger stones allow for the placement of more asphalt binder. Grades 3 and 4 are the most commonly used aggregates for seal coat construction in Texas. These grades are highlighted in blue in Table 1. Table 1.
a. Function of Sub base in Road Cross Section. It enables traffic stresses to be reduced to acceptable levels in sub-grade in the Road Cross Section so that excessive deformation is prevented. It acts as a working plate form for the construction of upper pavement layers. Acts as a drainage layer, by protecting the sub grade from wetting up.
Asphalt Pavement Association Of Michigan Selecting the Right Mix Penetration Grades – 1920's 85-100 120-150 200-300 Viscosity Grades – 1960's AC-2.5 AC-5 AC-10 PG Binders: Mid 90's PG 58-28 Asphalt Cement History
2 Design & Construction of Heavy-Duty Pavements NATIONAL ASPHALT PAVEMENT ASSOCIATION • QIP 123 Technical Report Documentation Page 1. Report No. Quality Improvement Series QIP-123 2. Report Date August 2019 3. Title and Subtitle Design & Construction of Heavy-Duty Pavements, 2nd Edition
to make check tests of the asphalt received on the Project site, and if the asphalt is not in accordance with the certified analysis, he may reject the material. The asphalt required by these Specifications shall conform to the requirements of The Asphalt Institute for the type and grade shown below: Asphalt for Seal Coating CRS-2 or CRS-2P
Oxidized bitumen can be used as an additive with bitumen for road construction. Bitumen penetration grade. Bitumen penetration grade 30/40 is suitable for road construction in tropical areas. Bitumen penetration grade 40/50 is suitable for asphalt pavements and it can be used in manufacturing hot mix asphalts for base and surface courses.
Road Aggregate 101: Specifications and Uses Gravel – unconsolidated rock fragments formed as a result of the weathering and erosion of larger rocks. PennDOT requires gravel used for road construction to be durable with a minimum of 85% crushed …
204.03.10 5) Subgrade tolerance for road-way and drainage excavation. Complete to within ± 0.1 foot of designated grade at time of final acceptance, except when rock subgrade is specified, the tolerance is ± 0.2 foot. 206.03.03 Moisture content of embank-ment or subgrade material. ± 2% of the optimum moisture content as deter-mined by KM 64-511.
to make check tests of the asphalt received on the Project site, and if the asphalt is not in accordance with the certified analysis, he may reject the material. The asphalt required by these Specifications shall conform to the requirements of The Asphalt Institute for the type and grade shown below: Asphalt for Seal Coating CRS-2 or CRS-2P
The base grade is generally used in corn stabilizing level. The I-5 or top is commonly used for homeowners and businesses. I-4 or Commercial top consist of a mixture of ¾ inches of stone and is used when added stability ans strength is needed for the asphalt. These are the different grades of asphalt, but are there any different types of asphalt?
Draining water from the road surface quickly, without letting it concentrate, is key to preventing erosion and thus to maintaining a stable driving surface. Two characteris-tics influence how well water drains from the road surface: the steepness of the road (i.e. its grade or gradient), and the shape and cross slope of the traveled way. The gra-
60-70 grade is usually used only in pavements where traffic is very heavy such as principle city streets and very heavily trafficked rural highways. The second grade, 85-100, is by far the most widely used material for plant mixes and is suitable for most pavements. It is also used in penetration macadam construction. The 120-150 grade is