List and define each of the main criteria that are used for evaluating a trial JPCP structure in the MEPDG method.

Question

What will be an ideal response?

Answer 1

The performance criteria used to evaluate a JPCP design are mean
transverse joint faulting, transverse slab cracking (bottom-up and top-down), and
smoothness. Threshold values deemed acceptable for each criterion are selected
initially. The values that result from analysis of a trial design using the MEPDG
are then compared to the acceptable thresholds and the design evaluated
accordingly. Transverse joint faulting refers to the extent to which transverse joint
have faulted such that continuity between slabs is lost. This is evaluated on a
monthly, incremental basis for the pavement design life. Transverse slab cracking
is evaluated as the percentage of slab expected to have transverse cracks at the
end of the design life of the proposed pavement structure. Smoothness pertains to
the profile of the pavement; the greater the deviation in the profile from its design,
the less smooth the pavement is said to be.