AASHTO T 368-17 (2021) PDF Download

AASHTO T 368-17 (2021) is a standard method for measuring the low-temperature flexural creep stiffness of bituminous sealants and fillers using the Bending Beam Rheometer (BBR). The purpose of this standard is to assess the flexural stiffness of bituminous sealants that are commonly used in road construction and maintenance.

The method described in this standard involves subjecting the sealant material to a bending load at low temperatures ranging from -4° to -40°C. The test can be performed on both unaged materials and materials that have been aged using a specified procedure known as TP 86.

The Bending Beam Rheometer (BBR) apparatus is used to determine the flexural creep stiffness of the sealant. This apparatus applies a controlled load to a test beam made of the sealant material, and the resulting deflections are measured. These measurements allow for the determination of the material's stiffness under low-temperature conditions.