Pavement Thickness Calculator
Inputs
AASHTO 1993: local road logESAL 5–6; arterial 6–7; interstate/highway 7–8
AASHTO T307/Mr=1500×CBR: soft clay 3,000 psi; stiff clay 8,000 psi; sand/gravel 15,000–20,000 psi
Tab to move between fields
Results
Required Structural Number
3.9
Asphalt Surface
4 in
Total Pavement Thickness
21 in
≈ 6 credit cards
Identify Input Parameters
4 parameters
= Design ESALs (log₁₀) = 6, Reliability = 90, Serviceability Loss (ΔPSI) = 2, Subgrade Resilient Modulus = 5000psi, Drainage Coefficient = 1
= 5 input(s) provided
Calculate Required Structural Number
Required Structural Number
= 3.9
= 3.9
Calculate Asphalt Surface
Asphalt Surface
= 4
= 4
Calculate Total Pavement Thickness
Total Pavement Thickness = asphaltThickness + baseThickness + subbaseThickness
= 21
= 21
Calculate Aggregate Base
Aggregate Base
= 10
= 10
Calculate Subbase
Subbase
= 7
= 7