Pavement Design AASHTO Calculator

Design flexible pavement thickness per AASHTO 1993: log(W18) = ZR·S0 + 9.36·log(SN+1) - 0.20 + log[ΔPSI/(4.2-1.5)]/..., where SN = a1D1 + a2D2m2 + a3D3m3. Layer coefficients for AC, base, subbase.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)
σy — Normal Stress Y (MPa)
τxy — Shear Stress (MPa)
⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.
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How to Use

Enter the values for the patient or scenario you are assessing. Design flexible pavement thickness per AASHTO 1993: log(W18) = ZR·S0 + 9.36·log(SN+1) - 0.20 + log[ΔPSI/(4.2-1.5)]/..., where SN = a1D1 + a2D2m2 + a3D3m3. Layer coefficients for AC, base, subbase. Use the pavement design result to inform your clinical assessment.

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