Aashto Flexible Pavement Design Excel — Spreadsheet

Even a well-built AASHTO flexible pavement design Excel spreadsheet can fail. Here are typical mistakes:

The spreadsheet automatically calculates the required structural number. (If using iterative solving, enable Excel iterations: File → Options → Formulas → Enable iterative calculation.)

Instead of static aᵢ values, use AASHTO’s correlations:

Update your spreadsheet to auto-calculate aᵢ when E_BS changes.