Browsing by Author "Chacón Romero, Dubraska Yamileth"

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Estudio de la hidrofobicidad de hormigones de F’C=240 KGCM2 con adición de dióxido de titanio ( Ti02)
(Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Carrera de Ingeniería Civil, 2018) Chacón Romero, Dubraska Yamileth; Medina Robalino, Wilson Santiago
In the present research project, the objective was to determine the hydrophobicity of the concrete with a dosage of 240 Kg / cm2, for which the addition of Titanium Dioxide (TiO2) will be implemented as substitution of different percentages of cement, understanding by hydrophobicity that property that certain materials have when they are able to repel the water that falls on their surface. To be able to evaluate the influence of Titanium Dioxide, it was necessary to elaboration of a series of test tubes with different concentrations, that is to say, with 5%, 10% and 15% of TiO2 to compare them with others made with a conventional reference concrete. To evaluate the hydrophobicity of the samples, it was necessary to test the concrete cylinders in hardened state at an age of 28 days and applying the European standard UNE-EN 12390-8. Also, the compression test of the specimens was carried out in compliance with ASTMC39 in order to determine if the addition of titanium dioxide produces an increase or decrease of its resistant capacity. Likewise, the ASTM C 231 standard was applied with the purpose to evaluate if the mix in fresh state with substitution of Titanium Dioxide allows the reduction of voids inside. Finally, it was determined that the samples studied did not have hydrophobicity characteristics with the addition of Titanium Dioxide, however, it did become waterproof, since the water was able to penetrate inside máximum 16 mm. In addition, it was obtained that the addition of TiO2 allowed the reduction of vacuum inside, and the increase of its resistance when it is subjected to a compression.