AASHTO M 323:2017 Standard Specification for Superpave Volumetric Mix Design.
Non-reagent-grade solvents may contain epoxy resins that may affect the properties of the recovered binder. In particular, certain acid-modified binders may be affected by non- reagent grade solvents.
3.9. reclaimed asphalt pavement (RAP,—removed and/or processed pavement materials containing asphalt binder and aggregate.
3.10. reclaimed asphalt pavement binder ratio (RAPBR,i —the ratio of the RAP binder in the mixture divided by the mixture’s total binder content.
3.11. voids in the mineral aggregate (VMA)—the volume of the intergranular void space between the aggregate particles of a compacted paving mixture that includes the air voids and the effective binder content, expressed as a percentage of the total volume of the specimen.
3.12. voids filled with asphalt (VFA)— the percentage of the VMA filled with binder (the effective binder volume divided by the VMA).
4. SIGNIFICANCE AND USE
4.1. This standard may be used to select and evaluate materials for Superpave volumetric mix designs.
5. BINDER REQUIREMENTS
5.1. The binder shall be a performance-graded (PG) binder, meeting the requirements of M 320, which is appropriate for the climate and traffic-loading conditions at the site of the paving project or as specified by the contract documents.
5.1 .1. Determine the mean and the standard deviation of the yearly, 7-day-average, maximum pavement temperature, measured 20 mm below the pavement surface, and the mean and the standard deviation of the yearly, 1-day-minimum pavement temperature, measured at the pavement surface. at the site of the paving project. These temperatures can be determined by use of the LTPPBind 3.1 software or can be supplied by the specifying agency. If the LTPPB1nd software is used, the LTPP high- and low-temperature models should be selected in the software when determining the binder grade. Often, actual site data are not available, and representative data from the nearest weather station will have to be used.
5.1.2. Select the design reliability for the high- and low-temperature performance desired. The design reliability required is established by agency policy.
Note 2—The selection of design reliability may be influenced by the initial cost of the materials and the subsequent maintenance costs.
5.1 .3. Using the pavement temperature data determined, select the minimum required PG binder that satisfies the required design reliability.
5.2. If traffic speed or the design ESALs warrant. increase the high-temperature grade by the number of grade equivalents indicated in Table I to account for the anticipated traffic conditions at the project site.AASHTO M 323 pdf download.