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?
Red Flag Submitted
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action.
Reply To This Thread
Posting in the Eng-Tips forums is a member-only feature.
As the semiconductor industry races to keep pace with Mooreâ€™s Law, which regards the doubling of transistors per square inch on integrated circuits, lithography hardware systems are not always able to provide a quality image for creating circuits. Download Now
Current integrated circuit (IC) designs are complex, which can result in different voltages being located close to one another. To prevent time dependent dielectric breakdown (TTDB), it is essential to incorporate space rules within IC design. Download Now