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Structural Number of a Flexible Pavement

Mediumpavement designstructural number
A flexible pavement is built with 4 in of asphalt concrete (layer coefficient 0.44), 8 in of aggregate base (0.14) and 10 in of subbase (0.11). Assuming drainage coefficients of 1.0, the structural number of this section is most nearly:
  1. A0.69
  2. B1.76
  3. C3.98
  4. D22.0
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Answer: C. 3.98

The structural number sums the product of each layer's thickness and its layer coefficient: SN = 4(0.44) + 8(0.14) + 10(0.11) = 1.76 + 1.12 + 1.10 = 3.98. Adding the thicknesses alone gives 22, adding the coefficients alone gives 0.69, and counting only the surface course gives 1.76.
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