AASHTO TP 132-19 (2021) PDF Download

AASHTO TP 132-19 (2021) is a standard that outlines the procedure for determining the dynamic modulus of asphalt mixtures using small specimens in the Asphalt Mixture Performance Tester (AMPT). The dynamic modulus is an important parameter for characterizing the mechanical behavior of asphalt mixtures under varying loading and temperature conditions.

This standard is specifically designed for dense-graded mixtures with nominal-maximum aggregate sizes up to 19.0 mm (0.75 in.). It provides guidelines for specimen preparation, loading, and testing procedures using the AMPT, which is a specialized device used to simulate the dynamic loading conditions experienced by asphalt mixtures in the field.

The test involves subjecting the asphalt mixture specimens to sinusoidal loading at different frequencies and temperatures, and measuring the corresponding strain and stress responses. These measurements are used to calculate the dynamic modulus, which represents the stiffness of the asphalt mixture and its ability to resist deformation under dynamic loading.

AASHTO TP 132-19 (2021) is a provisional standard, indicating that it may undergo revisions and updates based on further research, testing, and feedback from industry professionals. It provides a consistent and reliable method for determining the dynamic modulus of asphalt mixtures, enabling engineers and researchers to assess the performance and durability of asphalt pavements.