La finalidad de la investigación realizada en este documento es presentar el concreto reforzado con fibras de acero como alternativa de solución para la construcción de pavimento rígido. La necesidad de mejorar la calidad de los pavimentos rígidos frente a los problemas recurrentes de fisuración, optimizar costos, aumentar la calidad y optimizar los materiales para mejorar la sostenibilidad ambiental y social, impulsa el estudio e investigaciones sobre distintos aditivos que se agregan al concreto como también el tipo de refuerzo que lo complementa. Este documento se enfocará en realizar una propuesta de concretos reforzados con fibra de acero y cemento puzolánico para la construcción de pavimento rígido comparando las propiedades físicas y mecánicas de las mezclas y así obtener la mezcla más eficiente que cumpla las condiciones del expediente técnico para así realizar la aplicación en un tramo del proyecto de pavimentación en la provincia de Grau del departamento de Apurímac. / The purpose of the research carried out in this document is to present concrete reinforced with steel fibers as technical solution for the construction of concrete pavement an alternative solution for the construction of rigid pavement. In order to save costs per cubic meter per square meter of pavement and optimize raw material so increase quality and optimize materials to improve environmental and social sustainability, encourages the study and research on different chemical addition that are added to the concrete as well as the type of reinforcement that complements it. This document will focus on making a proposal of reinforced concrete with steel fiber and pozzolanic cement for the construction of rigid pavement by comparing the physical and mechanical properties of the mixtures and thus obtain the most efficient mixture that meets the conditions of the technical file in order to perform the application in a section of the paving project in the province of Grau of the department of Apurímac. / Tesis

The desire of the minerals industry to be more sustainable has led towards the increasing development of by-products. One such industry is the production of Alumina. The Alumina industry in Australia is the major producer of alumina in the western world with over 25 million tonnes of Bauxite Residue per annum. Alcoa World Alumina (Alcoa) has three refineries in Western Australia producing approximately 20,000 tonnes of Mud and a similar level of Red Sand each day. These as yet unutilised potential resources are being stockpiled, occupying a significant footprint. It is widely recognised within industry that there would be economic, environment and social benefits if a sustainable use for these materials were found. One such potential by-product is the production of coarse bauxite residue (Red Sand), neutralised and washed low in salt. The main purpose of this research was to establish a potential market for this material, through scientific evaluation of Red Sand as a replacement of natural fine aggregate (Natural Yellow Sand) in concrete mixes. For this research, the mixed stream of Bauxite Residue (fine and coarse) obtained in the Bayer process was neutralized by a process of carbonation then washed using cyclones and counter current wash towers to a value added byproduct. The coarse particles (Washed and Carbonated Sand-WCS) of the stream were separated by Wet High Intensity Magnetic Separation technique (WHIMS) so that different segments such as High Iron Sand (HIS) and Low Iron Sand (LIS) were formed. Physical, chemical and mineralogical properties of these materials have been tested and compared with that of natural sand. Several mixes of concrete were then designed using Red Sand as a fine aggregate in order to verify their effects on strength and durability indicators of concrete. / The comparative analysis between normal mix proportions and the mix proportions utilizing Red Sand was also achieved. In addition, the impact of marine environment on concrete mix design and properties of manufactured concrete were evaluated with a series of standard laboratory tests. The findings were promising in terms of both mechanical properties and durability and suggested that Red Sand, in particular Low Iron Sand is likely to be effective in place of fine aggregates and can be used within marine grade concrete with no major differences when compared to normal concrete. From the results obtained, it can be deduced that this material can be used in a wide range of concrete applications in Civil Engineering and Construction.

This research paper covers the analysis of the main asphalt concrete production technological processes. It includes calculation of dosed materials for the asphalt concrete mix, as well as precision and stability of maintenance of temperature necessary for the technological process.

El presente trabajo de investigación, se realizó con la finalidad de diseñar y evaluar una mezcla de concreto adicionada con nanosílice con aplicación a canales hidráulicos de primer orden expuestos a sulfatos en la costa norte del Perú, siendo analizada la situación del Proyecto Especial Chavimochic: Etapa I. Esta investigación se desarrolla a nivel experimental y abarca ensayos con estándares nacionales e internacionales (NTP, ASTM y NTC) en los agregados, agua, concreto en estado fresco y concreto en estado endurecido. En busca de garantizar el aumento de ciertas propiedades de los elementos en contacto con agentes agresivos, como los sulfatos, se evalúan los beneficios de incorporar nanosílice en la mezcla de concreto con 0.2%, 0.225% y 0.25%. Siendo el segundo porcentaje de adición el cual evidencia mejor trabajabilidad para una relación agua/cemento de 0.45. Como resultados se obtuvo que el concreto con nanosílice (CNS) presenta menor contenido de aire que la mezcla de concreto simple (CS). Además, la resistencia a la compresión y a la tracción aumentan en 3.41% y 19.48%, respectivamente, a la edad de 28 días con la adición de nanosílice. Asimismo, para el ensayo a exposición a sulfatos, las probetas con nanosílice evidenciaron un deterioro promedio del 50% menor en todas sus aristas en comparación a las probetas de concreto simple. Adicionalmente, se analizó el coeficiente de permeabilidad (k) para ambas mezclas y se determinó que el CNS presenta una permeabilidad baja y el CS una permeabilidad media. / The present research was carried out with the purpose of designing and evaluating a mixture of concrete added with nanosilica for application to first order hydraulic channels exposed to sulphates in the north coast of Peru, being analyzed the situation of the Chavimochic Special Project: Stage I. This research is developed experimentally and includes trials with national and international standards (NTP, ASTM and NTC) in the aggregates, water, concrete in fresh state and concrete in hardened state. In order to analyze the increase of certain properties of the structural elements in contact with aggressive agents, such as sulphates, the benefits of incorporating nanosilica in the concrete mixture with 0.2%, 0.225% and 0.25% are evaluated. Being the second percentage of addition, which shows better workability for a water / cement ratio of 0.45. As a result, it was obtained that the nanosilica concrete (NSC) presents lower air content than the simple concrete mixture (SC). In addition, the resistance to compression and tensile increase in 3.41% and 19.48%, respectively, at the age of 28 days with the addition of nanosilica. Likewise, for the sulphate exposure test, the specimens with nanosilica showed an average deterioration of 50% lower in all its edges compared to the simple concrete specimens. Additionally, the permeability coefficient (k) for both mixtures was analyzed and it was determined that the NSC has a low permeability and the SC a medium permeability. / Tesis