INTERACHONS BETWEEN LIME AND CLAY MINERALS - COUPLING BETWEEN THE PHYSICOCHEMICAL AND GEOTECHNICAL ASPECTS

摘要

Sustainable development is marked by an increasing need of re-using the materials directly encountered on earthwork projects. Lime stabilization appears to be a potential way since it can improve workability and mechanical properties of soils presenting low mechanical characteristics and sensitivity to water. Interactions between lime and soil particles lead a succession of complexes physicochemical reactions with variable kinetics (cationic exchange reaction, flocculation, pozzolanic reaction, carbonation...) which modify the mechanical behaviour of soil. However, following the nature of clay minerals present in the soil, the expected modifications and the improvement of mechanical behaviour are not always observed. A more precise knowledge about the development of physicochemical processes is then necessary to understand and determine how materials can be reemployed on substructure sites.