I am designing a cement-treated base (CTB) using the PCA design guidelines for a pavement over soft ground. The subgade will be a silty soil. I was asked by the PM if my design included AASHTO H-25 loading and now I understand it has to do with how axle loads are transferred to drainage structures (culverts?). The road is rural and most of the heavy traffic is 56,000 pound 4-axle gravel dumptrucks with a tandem axle (the fourth axle is retractable).
The PCA design procedure uses the fatigue factor to estimate CTB thickness. Does the AASHTO H-25 load diagram apply to the fatigue factor calculation?
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