UK rigid pavement design methodology

The other types of rigid pavements, unreinforced or jointed reinforced, are not excluded by the methodology. They can be used upon approval and certainly when an existing old JRCP is to be widened or rehabilitated. 

The methodology uses the foundation concept as in flexible pavements. Out of the four foundation classes established, class 1 is excluded for rigid pavements. 

The determination of the slab thickness is related to the traffic expressed in ESAL, the foundation class and the flexural strength of concrete. 

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Unlike UK rigid pavement design methodology, the CRCP with asphalt overlay is not enforced to be used in all new constructions. However, the use of lean concrete, cement-stabilised crushed aggregate or dense asphalt concrete as a sub-base material in moderate to heavily trafficked roads is necessary for lightly trafficked roads, unbound granular sub-base may also be used. 

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