Análisis del comportamiento del aditivo retardante en el concreto y su influencia en la mejora de la trabajabilidad, en la ciudad de Yurimaguas – Alto Amazonas – Loreto
Date
2021-11-17
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Universidad Científica del Perú
Abstract
Esta investigación se basó el análisis del comportamiento del aditivo retardante en el concreto para incrementar el tiempo de fraguado, como consecuencia de mejorar su trabajabilidad, en la ciudad de Yurimaguas – Alto Amazonas – Loreto. Tuvo como objetivo general, analizar el comportamiento del aditivo retardante en el proceso inicial de fraguado del concreto en la ciudad de Yurimaguas.
En la ciudad de Yurimaguas la temperatura promedio anual es de 25.90 °C, la temperatura mínima 15.2 °C y la máxima es 38.2°C. Por lo que se realizó el presente estudio, cuyo problema de la investigación queda plasmado con la siguiente interrogante: ¿De qué modo influye el aditivo retardante de fragua en la resistencia y tiempo de fragua del concreto para su mejor trabajabilidad? Esta investigación tuvo como objetivos general, determinar la influencia del
aditivo retardante en el comportamiento físico y en la resistencia a la
compresión a diferentes edades del concreto con f´c=210 kg/cm2, y sus objetivos específicos fueron: Estudio de propiedades físico y mecánico del agregado; determinar la influencia del aditivo retardante en el tiempo de fraguado del concreto; determinar la influencia del aditivo retardante en la
temperatura del concreto, peso unitario en el estado fresco y endurecido, con
respecto al concreto patrón, determinar y comparar los resultados de los ensayos de la resistencia a la compresión, del concreto patrón y el concreto con aditivo retardante, el análisis comparativo de métodos de medición de resistencia del concreto con aditivo retardante. Está presente tesis está basada antecedentes como fuentes nacionales e internacionales, normas, libros
relacionados al tema para esta manera tener un mayor enfoque de nuestro
tema.
En la actualidad se sabe que la pérdida de la trabajabilidad del concreto
supone una serie de problemas que, en numerosas ocasiones, se resuelven de
manera empírica como es la adición en exceso de agua, para mejorar ello se
emplean los aditivos plastificantes reductores de agua, con la finalidad de mejorar la manejabilidad y mayor facilidad de puesta en obra del concreto
fresco.
Esta investigación se hizo con la finalidad de determinar los porcentajes
óptimos de los aditivos plastificantes de cada marca, respecto al aumento de
resistencia a compresión, asentamiento y peso unitario del concreto. El uso de
los aditivos se realizó tomando en cuenta las normativas ASTM C494, ASTM
C125 y las fichas técnicas de cada marca.
Dicha investigación específicamente en un vaciado de techo en edificación
ubicado en Jr. Atanasio Jauregui Nº850. Se tuvo una muestra de control sin
aditivo y un grupo experimental con aditivo retardante, obteniéndose resultados
de mayor resistencia a la compresión en el grupo experimental, demostrando
que el aditivo si mejora la trabajabilidad.
This research was based on the analysis of the behavior of the retardant admixture in concrete to increase the setting time, because of improving its workability, in the city of Yurimaguas - Alto Amazonas - Loreto. Its general objective was to analyze the behavior of the retardant additive in the initial process of setting concrete in the city of Yurimaguas. In the city of Yurimaguas, the annual average temperature is 25.90 ° C, the minimum temperature is 15.2 ° C and the maximum is 38.2 ° C. Therefore, the present study was carried out, whose research problem is reflected with the following question: How does the setting retarder additive retardant influence the strength and setting time of concrete for its better workability? This research had as general objectives, to determine the influence of the additive retardant in the physical behavior and in the resistance to compression at different ages of the concrete with f´c = 210 kg / cm2, and its specific objectives were: Study of physical properties and aggregate mechanic; determine the influence of the additive retardant on the setting time of concrete; determine the influence of the additive retardant on the temperature of the concrete, unit weight in the fresh and hardened state, with respect to the standard concrete, determine and compare the results of the compressive strength tests, of the standard concrete and the concrete with Additive retardant, the comparative analysis of concrete strength measurement methods with retardant admixture. This thesis is based on antecedents such as national and international sources, standards, books related to the subject to have a greater focus on our subject. At present it is known that the loss of workability of concrete involves a series of problems that, on many occasions, are solved empirically, such as the addition of excess water, to improve this, water-reducing plasticizer additives are used, to improve the manageability and easier installation of fresh concrete. This research was done to determine the optimal percentages of the plasticizer additives of each brand, with respect to the increase in compressive strength, settlement and unit weight of concrete. The use of additives was carried out considering the ASTM C494, ASTM C125 regulations and the technical data sheets of each brand. Said investigation specifically in a roof emptying in a building located at Jr. Atanasio Jauregui Nº850. There was a control sample without additive and an experimental group with retarding additive, obtaining results of greater resistance to compression in the experimental group, showing that the additive does improve workability.
This research was based on the analysis of the behavior of the retardant admixture in concrete to increase the setting time, because of improving its workability, in the city of Yurimaguas - Alto Amazonas - Loreto. Its general objective was to analyze the behavior of the retardant additive in the initial process of setting concrete in the city of Yurimaguas. In the city of Yurimaguas, the annual average temperature is 25.90 ° C, the minimum temperature is 15.2 ° C and the maximum is 38.2 ° C. Therefore, the present study was carried out, whose research problem is reflected with the following question: How does the setting retarder additive retardant influence the strength and setting time of concrete for its better workability? This research had as general objectives, to determine the influence of the additive retardant in the physical behavior and in the resistance to compression at different ages of the concrete with f´c = 210 kg / cm2, and its specific objectives were: Study of physical properties and aggregate mechanic; determine the influence of the additive retardant on the setting time of concrete; determine the influence of the additive retardant on the temperature of the concrete, unit weight in the fresh and hardened state, with respect to the standard concrete, determine and compare the results of the compressive strength tests, of the standard concrete and the concrete with Additive retardant, the comparative analysis of concrete strength measurement methods with retardant admixture. This thesis is based on antecedents such as national and international sources, standards, books related to the subject to have a greater focus on our subject. At present it is known that the loss of workability of concrete involves a series of problems that, on many occasions, are solved empirically, such as the addition of excess water, to improve this, water-reducing plasticizer additives are used, to improve the manageability and easier installation of fresh concrete. This research was done to determine the optimal percentages of the plasticizer additives of each brand, with respect to the increase in compressive strength, settlement and unit weight of concrete. The use of additives was carried out considering the ASTM C494, ASTM C125 regulations and the technical data sheets of each brand. Said investigation specifically in a roof emptying in a building located at Jr. Atanasio Jauregui Nº850. There was a control sample without additive and an experimental group with retarding additive, obtaining results of greater resistance to compression in the experimental group, showing that the additive does improve workability.
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Keywords
Aditivo retardante, Tiempo de fraguado, Trabajabilidad, Retardant additive, Setting time, Workability
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