H-25 Loading
H-25 Loading
(OP)
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?
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?





RE: H-25 Loading
Here is a primer on AASHTO pavement design that hopefully will help:
http://training.ce.washington.edu/wsdot/
Many other resources are also available online. Google "AASHTO pavement design"
Jeff
RE: H-25 Loading
RE: H-25 Loading
How many ESALS per HS-25?
"...students of traffic are beginning to realize the false economy of mechanically controlled traffic, and hand work by trained officers will again prevail." - Wm. Phelps Eno, ca. 1928
"I'm searching for the questions, so my answers will make sense." - Stephen Brust