The design procedure for rigid pavements presented in the AASHTO design guide is also based on the field results of the AASHO Road Test. The AASHTO design procedure is applicable to jointed-plain concrete pavements, jointed-reinforced concrete pavements, and continuously-reinforced concrete pavements. Jointed- plain concrete pavements (JPCP) do not have slab-reinforcing material and can have doweled joints or undoweled joints. The traverse joints between slabs are spaced at about 10 to 13 ft. Jointed reinforced concrete pavements (JRCP) have steel reinforced slabs with joints that are 40 ft or more apart. Finally, continuously- reinforced concrete pavements (CRCP) do not have traverse expansion/ contraction joints, necessitating the use of extensive steel-bar reinforcement in the slab. The idea with both jointed-reinforced and continuously-reinforced pavements is to permit slab cracking but to provide sufficient slab reinforcement to hold the cracks tightly together to ensure load transfer. It is important to note that faulting, which is a distress characterized by different slab elevations, was not a failure consideration in the AASHO Road Test, and thus the design of undoweled joints must be checked with a procedure other than that presented here.

The design procedure for rigid pavements is based on a selected reduction in serviceability and is similar to the procedure for flexible pavements. However, instead of measuring pavement strength by using a SN, the thickness of the PCC slab is the measure of strength.

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