LATEST DEVELOPMENTS IN THE ANALYTICAL METHODS FOR THE DESIGN OF NEW PAVEMENTS AND STRENGTHENING OVERLAYS IN BELGIUM. SIXTH INTERNATIONAL CONFERENCE, STRUCTURAL DESIGN OF ASPHALT PAVEMENTS, VOLUME I, PROCEEDINGS, UNIVERSITY OF MICHIGAN, JULY 13-17, 1987, ANN ARBOR, MICHIGAN

The practical methods presented are primarily intended for project designers and those responsible for road networks (State, Provincial or Municipal authorities). The object of the proposed method for the structural design of new bituminous pavements is to avoid fatigue cracking of bituminous layers and excessive permanent deformation of road structures. The practical solutions recommended offer a choice between two variants: flexible structures (bituminous layers, crushed stone base, granular sub-base); and semi-rigid structures (bituminous layers, lean concrete base, granular sub-base). The object of the proposed method for the design of strengthening overlays of old flexible pavements is the determination of the thicknesses of the strengthening layers and also the thicknesses of the layers to be eventually rebuilt. Several variants of the solution are proposed with a view to a technico-economic comparison. The paper is a synthesis grouping the latest developments of analytical methods based on results of fundamental researches presented to the former Ann Arbor Conferences (1967, 1972, 1977 and 1982).