AASHTO R 99-21 PDF Download

The AASHTO R 99-21 standard is titled "Standard Practice for Troubleshooting Asphalt Specimen Volumetric Differences between Superpave Gyratory Compactors (SGCs) Used in the Design and the Field Management of Superpave Mixtures." It outlines the procedure for troubleshooting volumetric differences in asphalt specimens between Superpave gyratory compactors (SGCs) used in the design and field management of Superpave mixtures.

The standard emphasizes the importance of evaluating the SGCs used in various stages, including the one used in mix design, production quality control (QC), and production quality assurance (QA). The goal of this evaluation is to identify any within-procedure differences that might affect the field management of asphalt mixtures. By examining and addressing these differences, the standard aims to ensure better quality control and consistency in asphalt mixture production and performance.