Patent ID: 7004673

Claim:
A semi-rigid pavement as a composite structure comprising: an asphalt surface course; a concrete subbase wherein the coarse aggregate of concrete is small grains crushed limestone finer than 9.5 mm of grading intermediate between the coarse and fine aggregates in the Terminology of ASTM C125 defined as enriched limestone waste; a layer of granular material between surface course and concrete subbase, rigidity of said pavement being provided by said concrete subbase, its flexibility being provided by said asphalt surface course, the layer of granular material resting on said concrete subbase allowing the asphalt surface course to work as a flexural part of this composite structure; and said granular layer allowing the limitation of deformations and corresponding reduction of fatigue stresses and cracking of said asphalt surface course to desirable level by the choice of thickness and quality of granular material, the concrete of said subbase being characterized by specified compressive strength f c′ and modulus of rupture (MR) up to 5,000 and more than 750 psi, respectively.