Community Research and Development Information Service - CORDIS

Mix design procedure for hot bituminous mixtures with reclaimed asphalt

One of the important steps in the rehabilitation of roads with hot reclaimed asphalt, is the design of the hot bituminous mixtures. A first step in this design procedure is the analytical design of the mixture making use of the characteristics of its constituents (new granular material, reclaimed asphalt, new binder). By means of this preliminary analytical design step, the number of experimental tests to check the basic mix characteristics against specifications and to judge its performance can be limited.

Use was made of a design software Prado-win, developed earlier at BRRC and widely used in Belgium for the design of hot bituminous mixtures. Within this project this software was used and adapted for the use of mixes with reclaimed asphalt. It could be shown within this project that the so-calculated values corresponded well with the measured values on the mix composition. Hence, this analytical mix design procedure could be validated for hot mixes with reclaimed asphalt.

This software is distributed by BRRC. Seminars, training courses are organized at regular time intervals and the design procedure has been presented at national and international conferences.

The software is especially suitable to make a good estimate of the impact of changes in the characteristics of the RA or in the new materials.

Reported by

Belgian Road Research Centre (BRRC)
Woluwedal 42
1200 Brussels
Belgium
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