Characterization of the reactivity of road aggregates with respect to bituminous emulsions: petrographic analysis

The first article [1] dealt with the fine-scale petrographic characterization of a set of aggregates rep-resentative of the diversity of Europe’s quarries. The levels of rock alteration were estimated in thisfashion. The mobilization of alkalis in alteration products serves to limit the reactivity of aggregateswithin a basic medium, from which the alkali-reaction originates [2]. This second article appliessuch a concept to reactivity in an acid medium.Ion exchanges between the filler, the most highly-reactive part [3], were studied in an aqueousmedium and the ensuing water analyses could be compared with water extractions performeddirectly on cold-rolled mixes, in order to evaluate the pertinence of these exchanges.


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