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Calculate The Structural Number For Flexible Pavement:     Calculation: Designer/Checker:     Input:     Metric Units   Asphalt layer thickness (ta - in or mm) Layer coefficient for asphalt (a1) Base layer thickness (tb - in or mm) Layer coefficient of base (a2) Sub-base layer thickness (ts - in or mm) Layer coefficient of sub-base (a3) Thickness of additional layer (tad - in or mm) Layer coefficient of additional layer (a4)               Output:     Login to enable the Formulas! Not a Member? Join Now!     Structural No. (SN) =           Start Using The Calculations >>> Become A Member Now!

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