Abstract
The present paper reviews the interaction of synthetic and natural iron oxides withclay surfaces in terms of the charge characteristics of iron and clay minerals, and therole of iron oxide in the clay soil behaviour. The association of iron oxide particleswith clay surfaces in the synthesized iron oxide-clay complexes was due to coulombicattraction. For natural clay soils the specific adsorption of anions on iron oxides affectedthe association between iron oxides and clay minerals. Addition and extraction of ironhydroxides and oxides in clays indicated that iron minerals contribute to a decreaseof sensitivity and an increase of Bingham yield stress.
