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Section 5: Determining Concrete Pavement Thickness

The computed concrete slab thickness usually contains fractions of inches, round the thickness up to the nearest full or half inch. For example, use slab thickness of 11.5 in. for computed thickness of 11.4 in. and use slab thickness of 10 in. for computed thickness 10.24 in.

  • Use 6 in. for slab thickness if the computed thickness is less than 6 in.
  • Use 13 in. for slab thickness if the computed thickness is greater than 13 in.

The minimum concrete pavement thickness is reduced from 8 in. to 6 in. Allowing the design to account for an increased effective modulus of subgrade reaction by utilizing thickened base/subbase layers will help ensure the structural adequacy for the pavement system.

The maximum concrete pavement thickness is reduced from 15 in. to 13 in. Districts should submit designs thicker than 13 in. to the District Engineer for approval along with their justification for doing so.


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