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AASHTO TP 122-16 (2020) Download

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Provisional Standard Method of Test for Determination of Performance Grade of Physically Aged Asphalt Binder Using Extended Bending Beam Rheometer (BBR) Method
standard by American Association of State and Highway Transportation Officials, 2016

Category:

Description

AASHTO TP 122-16 (2020) covers the determination of the low-temperature performance grade (i.e., minimum design pavement temperature) of asphalt binders by means of a bending beam rheometer after going through a physical aging (physical hardening) process. It is applicable to material having a flexural stiffness value from 20 MPa to 1 GPa (creep compliance values in the range of 50 nPa-1 to 1 nPa-1) and can be used with material aged using T 240 (RTFO) or R 28 (PAV) or with recovered asphalt binder. The test apparatus is designed for testing within the temperature range from -36 to 0°C.

The bending beam rheometer method used in T 313 conditions samples for 1 h and tests at a temperature 10°C warmer than the low-temperature performance grade to determine if the asphalt binder passes the low-temperature requirement. This standard requires testing at two temperatures, to determine by extrapolation a limiting temperature for each of the three conditioning times and two conditioning temperatures.

Low-temperature physical aging of asphalt varies as a function of temperature and time. This standard conditions at 10°C and 20°C warmer than the low-temperature performance grade for periods of 1 h, 24 h, and 72 h to simulate the effect of extended conditioning at two different cold temperatures.

Test results are not valid for beams of asphalt binder that deflect more than 4 mm or less than 0.08 mm when tested in accordance with this method.

Product Details

Published:
2016
Number of Pages:
9
File Size:
1 file , 1.1 MB
Product Code(s):
TP122-16-UL, TP122-16-UL, TP122-16-UL