The bentonite analyzed comes from Cerro Mocho, district of Ignacio Escudero, province of Sullana, whose UTM coordinates are 9468762 (N) and 508203.00 (E), zone 17; corresponding to quadrangle 10b of the national geological map.  The expansive soils constitute a recurrent problem from the geotechnical point of view for the structures that are built on them; due to their composition rich in montmorillonite {Ca0.2(Al,Mg)2Si4O10(OH)2.xH2O}, which belongs to the smectite group; bentonites, when in contact with water, react increasing their volume, being representative of the most expansive clays; their use as experimental material for the simulation of this type of complex soils is ideal; it is therefore important an analysis that involves the knowledge of their physical and chemical properties and their mineralogical composition that influences this expansive behavior. The procedur...