Browsing by Author "Romero Bayas, Cristina Isabel"

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    Estudio del comportamiento de una mezcla asfáltica convencional y una mezcla asfáltica con agregado de origen volcánico (escoria y arena), adicionadas con polímero etileno vinil acetato (EVA), utilizando el ensayo MARZHALL
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Carrera de Ingeniería Civil, 2017) Romero Bayas, Cristina Isabel; Pérez Maldonado, Ruth Lorena
    In the present experimental project, the results obtained from a study are analyzed to improve the properties of the asphalt mixture with Polymer Ethylene Vinyl Acetate (EVA). Besides, two types of stone material were used for shaping the blends which are convencional materials from the Villacrés Mine and material of volcanic origen from the city of Baños, in order to determine the suitability of each material for the preparation of the mixture. To achieve the proposed objectives, the Marshall test was used. In first instance tests were performed with the fine and coarse aggregates, according to the specifications of the respective standards. Tests were then carried out on the asphalt to determine the required properties and verify if it is suitable for use in the mixture. Afterwards, the Eva polymer was obtained with its respective technical data sheet, in the Industrial Plasticaucho Company. Finally, 15 briqquetes with convencional mixture and 15 with aggregates of volcanic origen were elaborated; 3 specimens with each percentage of asphalt: 5, 5,5, 6, 6,5 and 7%, of which 6.4% and 6.6% were obtained as an optimum percentage of asphalt for each class of mixture respectively. Once this was done, 12 briquettes were prepared with the optimum percentage of asphalt and 0, 2, 3 and 4% of EVA; 3 specimens for each percentage, resulting in a significant increase in stability with 6.4% asphalt and 3.3% EVA for the conventional blend and 6.6% asphalt and 3.2% EVA for the mixture with scoria and volcanic sand. The flow values are also optimized significantly with these percentages, which clearly indicates that the incorporation of EVA Polymer in the asphalt mixture improves the properties of the blend. As a consequence of the present study, it is feasible to use EVA for the improvement of asphalt mixtures, in addition to setting a precedent for future research on the benefits of using this polymer in modified mixtures in Ecuador.