The following calculator outputs the asphalt fatigue constant (k) based on the the Shell Equation – see equation 25 on page 84 of Austroads Guide to Pavement Technology: Part 2: Pavement Structural Design.
Please note: the Calculator is valid for both Austroads 2004-12 and 2017 Design Methods.
The value of k is in the units used by CIRCLY:
New! The calculator is now built into CIRCLY 7.0.