Evaluation of Rice Husk Ash and Gypsum on the stability of Sandy Soils

Espinoza S.J.G.; Tamae F.N.S.; León R.G. · International Conference on Civil, Structural and Transportation Engineering (2026) · DOI: 10.11159/iccste26.163

Resumen

This research addresses the problem of low stability in sandy soils, where natural geotechnical properties do not ensure adequate performance for future civil engineering works. To improve this condition, soil stabilization was evaluated using mi xtures of rice husk ash and gypsum at two dosages: 10 percent rice husk ash with 5 percent gypsum, and 15 percent rice husk ash with 5 percent gypsum. The methodology included shear strength and permeability tests to compare the behavior of treated soil with that of natural soil. The results showed that the mixture containing 10 percent rice husk ash and 5 percent gypsum increased shear strength and reduced permeability, achieving an adequate balance between mechanical and hydraulic performance. In contrast, the mixture with 15 percent rice husk ash reduced shear strength, despite exhibiting lower permeability. It is concluded that the optimal proportion is 10 percent rice husk ash and 5 percent gypsum, as it provides effective improvements without negatively affecting soil strength.

Instituciones: Universidad Peruana de Ciencias Aplicadas