Estudio de la estabilización de arcillas expansivas utilizando el 10, 20 y 30% en peso, de puzolanas de ceniza del volcán Tungurahua y ceniza de la cascarilla de arroz en composiciones iguales

Abstract

With the use of these two natural pozzolans from rice husk ash and volcanic ash the potential for volumetric change of expansive clays was reduced. Several physical and mechanical laboratory tests were performed: moisture content, SUCS classification, specific gravity, soil compaction, permeability, expansion rate, consolidation and direct cutting in samples in their natural state and with the dosages at 10%, 20% and 30% of pozzolans of volcanic ash and rice husk ash in equal compositions. In addition, an analysis of the soil structure was carried out with a scanning electron microscope, to show the distribution of the particles. When pozzolan particles come into contact with water, they function as a cementing agent, which, in addition to compaction, reduces the effect of volumetric change in these soils. Based on the results obtained in all the tests, it has been possible to confirm that with 20% pozzolan replacement, optimum stabilization results are achieved, reducing the value of the expansion rate from 34% to 62%.