Given the following design conditions, check if the suggested thickness of 9.0 inches is acceptable for fatigue and erosion performance according to the PCA design method. Attach PCA tables and graphs with your selections marked for design. Design conditions Type: Four-lane highways with moderate traffic volume Traffic: ADT
=4,200
(two-way) Truck factor
=5%
Growth rate
=4%
Directional Distribution Factor
=0.5
Design Period
=30
years Axle load spectrum (see Table1) Subgrade: Clay,
k=150
psi/in Subbase: no subbase PCC slab: Mr = 500 psi, Doweled JPCP, Concrete Shoulders Table 1 Axle load spectrum