AASHTO TP 105-20 PDF Download

AASHTO TP 105-20 is a standard method used to determine the fracture energy of asphalt mixtures using the semicircular bend geometry (SCB). This standard provides procedures for calculating the fracture toughness (KIC) and stiffness (S) of the asphalt mixtures.

The SCB specimen used in this method is a half disc with a notch, with the length of the notch measured in meters and an angle (a) measured with respect to the vertical axis of the disc.

The purpose of this standard is to evaluate the fracture resistance of asphalt mixtures at low temperatures. The parameters obtained from this method are used in the new low-temperature module of the Mechanistic Empirical Pavement Design guide.

The procedures described in this standard are applicable to test specimens that have a maximum aggregate size of 19 mm or less. The specimens should have a diameter of 150 ± 9 mm and a thickness of 24.7 mm ± 2 mm. These procedures are valid for temperatures below the lower limit of the asphalt binder's performance grade (PG) plus 22°C.