| Figure 11. Reflective Cracking Modeling for Various Rigid Bases and HMA Thicknesses
For 50,000,000 ESALs, as the rigidity of the base increased, the number of repetitions to
achieve 5% reflective cracking on the HMA overlay decreased. This suggests that using a stiffer
base would tend to generate more reflective cracking on the surface. It should be noted however,
that the results obtained may differ in the case of the CRCP because the reinforcement will
decrease the crack opening. The thickness of the HMA layer has some effect on the retardation
of reflective cracking to reach the surface; this is particularly noticeable for thicknesses between
25 and 100 mm (1 and 4 in). In addition, the minimum HMA thickness of 100 mm (4 in) to
control reflective cracking is supported by the results in Figure 11, in which the load repetitions
to reflective cracking for any HMA thicknesses less than 100 mm (4 in) are significantly reduced.
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