Thesis CARACTERIZACIÓN EXPERMENTAL DE HORMIGONES REFORZADOS CON CUANTÍAS MEDIAS DE FIBRAS SINTÉTICAS.
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Date
2016
Authors
CAMPOS VARGAS, CRISTOPHER LUIS
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Abstract
Dentro de la construcción, el hormigón forma una parte fundamental en variadosprocesos constructivos, es por esto que una de las innovaciones del último tiempo ha sidointegrar en sus procesos al Hormigón Reforzado con Fibra, respondiendo a la abreviaturade “HRF” el cual tiene como respuesta una significativa mejora ante las cargas que actúanusualmente sobre el hormigón y su resistencia (compresión, tracción y flexo tracción).El principal objetivo de los HRF, es entregarle al hormigón la capacidad de soportarmayores deformaciones antes de llegar a la completa rotura, transformándose así en unmaterial más dúctil gracias al agregado de fibra sintética, permitiéndole absorber unacantidad mayor de energía en comparación a otros hormigones tradicionales, entregandocomo resultado esperado altos índices de tenacidad.Actualmente se cuestiona el carácter de estructural de las fibras sintéticas que seutilizan para reforzar hormigones, debido a que los resultados de ensayos con cuantíasbajas a medias de fibras exhiben un comportamiento clasificado como ablandamientointenso a ligero, de acuerdo al Código Modelo MC 2010. No obstante, estas fibras estánsiendo ampliamente utilizadas para el refuerzo de shotcrete en la construcción de túnelesen faenas mineras y centrales hidroeléctricas. (Sergio Carmona Malatesta, 2016)Los ensayos de HRF bajo las normas EN-14651 y ASTM C-1609, permiten controlarla carga aplicada y registrar la deformación gradual de la probeta permitiendo, con elanálisis de datos, entregar como resultados valores de Resistencia Residual a la tracciónpor flexión. Estas son inferidas a través de valores de carga y apertura CMOD de la fisuraresultante, o carga y deflexión al centro del campo con la aplicación de cargas puntuales alas cuales son sometidas las probetas. De acuerdo al análisis de estos resultados es posibleclasificar el carácter estructural de las fibras sintéticas.Por último, esta investigación tiene como finalidad ser un aporte a futurastecnologías para el Hormigón, ayudando a orientar a próximos lectores interesados enconocer el comportamiento de los HRF en distintas dosificaciones, por lo cual a lo largo deesta campaña experimental se incluirán las normativas de los ensayos e imágenes de losprocedimientos en el laboratorio.
In construction, the concrete forms a key part in various construction processes,which is why one of the innovations of recent times has been integrated into their processesto Fibre Reinforced Concrete, responding to short for "HRF" which has significantimprovement in response to the loads acting on the concrete usually and resistance(compression, tension and flexion traction).The main objective of the HRF, is to give the concrete the ability to withstand greaterdeformation before reaching complete rupture, thus becoming a more ductile materialthanks to the addition of synthetic fiber, allowing it to absorb a greater amount of energycompared to other traditional concretes, delivering expected results in high levels oftoughness.The character of structural synthetic fibers used to reinforce concrete is nowquestioned because test results with low amounts half of fibers exhibit a classified behavioras intense a slight softening, according to the Model Code MC 2010. However, these fibersare being widely used for reinforcing shotcrete in tunnel construction in mining andhydroelectric plants tasks. (Sergio Carmona Malatesta, 2016)Tests HRF under EN-14651 and ASTM C-1609 standards to control the applied loadand record the gradual deformation of the specimen allowing, with data analysis, deliveredas results values Residual Tensile bending. These are values inferred through load andCMOD opening of the resulting fissure, or load and deflection at midfield with theimplementation of specific loads to which they are subjected the specimens. According tothe analysis of these results it is possible to classify the structural nature of synthetic fibers.Finally, this research is intended as a contribution to future technologies forConcrete, helping to guide next readers interested in the behavior of FRC in differentdosages, so throughout this experimental campaign regulation will be included of the testsand imaging procedures in the laboratory.
In construction, the concrete forms a key part in various construction processes,which is why one of the innovations of recent times has been integrated into their processesto Fibre Reinforced Concrete, responding to short for "HRF" which has significantimprovement in response to the loads acting on the concrete usually and resistance(compression, tension and flexion traction).The main objective of the HRF, is to give the concrete the ability to withstand greaterdeformation before reaching complete rupture, thus becoming a more ductile materialthanks to the addition of synthetic fiber, allowing it to absorb a greater amount of energycompared to other traditional concretes, delivering expected results in high levels oftoughness.The character of structural synthetic fibers used to reinforce concrete is nowquestioned because test results with low amounts half of fibers exhibit a classified behavioras intense a slight softening, according to the Model Code MC 2010. However, these fibersare being widely used for reinforcing shotcrete in tunnel construction in mining andhydroelectric plants tasks. (Sergio Carmona Malatesta, 2016)Tests HRF under EN-14651 and ASTM C-1609 standards to control the applied loadand record the gradual deformation of the specimen allowing, with data analysis, deliveredas results values Residual Tensile bending. These are values inferred through load andCMOD opening of the resulting fissure, or load and deflection at midfield with theimplementation of specific loads to which they are subjected the specimens. According tothe analysis of these results it is possible to classify the structural nature of synthetic fibers.Finally, this research is intended as a contribution to future technologies forConcrete, helping to guide next readers interested in the behavior of FRC in differentdosages, so throughout this experimental campaign regulation will be included of the testsand imaging procedures in the laboratory.
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Catalogado desde la version PDF de la tesis.
Keywords
CARACTERIZACION DE HORMIGONES , FIBRAS SINTETICAS , HRF