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The predecessor of cncPAVE was cncRISK, ending with the cncRISK472 version in 2002.

 

The development of the cncRISK system started in 1998 when BKS was commissioned by the Cement and Concrete Institute and South African National Road Agency to do so. The effort was triggered by the need to update the M10 design manual and to incorporate in it the design mechanistic principles. The outcome of the effort was the launching of the first version of the cncRISK program in July 2000.

 

The cncRISK system provided guidance to the designer by calculating the probability of structural failure. Structural failure was defined as a situation in which the number of load applications n a pavement is supposed to carry over the design period exceeds the number of load applications N the pavement can carry at an acceptable level of structural integrity.

 

In contrast to cncRISK, cncPAVE evaluates the consequences, at the end of a design period, of a certain pavement configuration, in terms of the percentage of shattered concrete, percentage of surface pumping, faulting, and crack spacing in case of continuously reinforced concrete. The life-cost module was added in cncPAVE. Other features in cncPAVE were an extensive FACTS page and the WHAT-IF facility.

 

The performance of the different types of concrete pavements used in the roads system as well as some experimental sections have been re-evaluated and subsequently the calculation of stress as well as the behavior of the pavements have been adjusted. This resulted in the adjustment of the damage constant "a" to fit the predicted performance. The calculated crack width and the relative vertical movement at transverse cracks and / or joints are also now shown.

 

cncPAVE was further developed by The Concrete Institute to be a web based system.