Patent ID: 6158920
Filing Date: 2000-12-12
Classification: E01C

Abstract:
Roadway structure comprising:a top layer;at least one asphaltic rigid foundation layer with a high modulus of rigidity greater than or equal to 14.times.10.sup.3 MPa which supports the top layer;a base supporting the foundation layer chosen from the group consisting of earth, a layer of untreated loose stony material bedded on the earth, and a damaged roadway; andan under layer formed on said base and beneath and adherent to said foundation layer and having a thickness effective to give a surface for the foundation layer supported thereon, wherein the under layer has low macroroughness, defined by a sand height of less than or equal to 4 mm according to NFP method 98-216-1, and a high surface evenness sufficiently smooth and flat so as to increase service life by reducing cracking due to mechanical fatigue that would occur in the absence of such an under layer.