Franco-Nieves, Luis A.

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    Evaluación experimental de las propiedades mecánicas de mezcla de goma triturada y arena Ottawa
    (2012-07) Franco-Nieves, Luis A.; Camacho-Padrón, Beatriz I.; College of Engineering; Ramos Cabeza, Ricardo; Suárez Colche, Luis E.; Department of Civil Engineering; Santiago Santiago, Nayda G.
    During this investigation the effect on the mechanical properties of Ottawa sand when different percentages of shredded tires added to the sand specimens was studied. In addition, an alternative for recycling shredded tires as backfill material for retaining walls was analyzed. Shredded tires are considered a cost effective material that has the advantages of having a low unit weight and good drainage properties. As part of this investigation, different percentages of shredded tire was mixed with Ottawa sand to study the effect it has on the geotechnical properties of this sand such as particle size, unit weight, specific gravity, void ratio, permeability, cohesion, angle of internal friction, and initial tangent modulus. The geotechnical properties of a soil are fundamental for designing, modeling and solving a variety of engineering problems. Therefore, the results of this research were used to evaluate the behavior of a cantilever retaining wall and a mechanically stabilized earth wall. It was observed that increasing the amount of shredded tires in Ottawa sand specimens causes a decrease in the sample’s unit weight. The permeability of the Ottawa sand specimens, shredded tires specimens and specimens with different percentages of shredded tires were found to be very close and similar to values reported in the literature for granular material. The permeability varies between 8.04 x 10-2 and 6.17 x 10-2 cm/seg. Adding shredded tires to Ottawa sand specimens at 10% and 20% by volume increases the angle of internal friction of the sand specimens when failure is defined at large deformations (εa = 20%) by as much as 9°, this increment leads to an increase in the soil resistance; while the effect of adding shredded tires in sand specimens when failure is defined at low deformations (εa < 4%) is to decrease the angle of internal friction of the Ottawa sand specimens. The results for the analysis of the retaining structures were found to be favorable for the different percentages of shredded tires studied and the different conditions analyzed during this investigation. However, the results obtained suggest to limit the amount of shredded tires added to the Ottawa sand to percentages less than or equal to 20%.