Publication: CARACTERIZACIÓN DE LAS PROPIEDADES DE LOS HRFA MEDIANTE LA NORMA EN 14651
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Date
2016
Authors
PÉREZ MARICOY, JOSELYNE CARLA
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Abstract
A lo largo de los últimos años, el estudio de hormigón reforzado con fibras (HRF)se ha incrementado, con el fin de hacer uso de las ventajas y mejoras que presenta a nivelconstructivo en algunas circunstancias. Dentro de nuestro país se ha acrecentado el uso delos HRF, considerando que al incorporar fibras al momento del amasado, se obtienenbeneficios relacionados con el aumento de las cualidades frente a la flexión, fisuración ytracción entre otras; los usos que se le han dado a los HRF son diversos, van desderefuerzo de túneles (hormigón proyectado) hasta elementos prefabricados.Actualmente y de manera tradicional, las propiedades y el comportamiento de loshormigones reforzados con fibras se han caracterizado y evaluado mediante ensayos deflexotracción con cargas a los tercios, sin embargo la certeza y precisión de éstos se havisto cuestionada debido a la alta dispersión de los resultados obtenidos, la cual puede sergenerada por pérdida de control del ensayo en el momento del agrietamiento, fisuraciónfuera del plano de carga, entre otros.A fin de subsanar los distintos problemas experimentales que se han encontrado enlos ensayos, se desarrolló una investigación entre varios laboratorios donde se propone paralos HRF, un ensayo de flexión sobre una vigueta con entalla central y cargada en el centrode la luz, el cual posteriormente fue normalizado en Europa mediante la EN 14651, normaque determina los parámetros utilizados por el Código Modelo del ComitéEurointernacional del Hormigón (CEB) para el diseño estructural de elementos de HRF.Considerando lo anterior, a través de la presente memoria se propone desarrollar unacampaña experimental para caracterizar las propiedades de hormigones reforzados confibras de acero (HRFA) mediante el ensayo especificado en la norma EN 14651.Para poder caracterizar y evaluar el comportamiento del hormigón reforzado confibras, se confeccionarán probetas prismáticas, las cuales serán ensayadas posteriormentede dos maneras, la primera de acuerdo a lo especificado en la norma EN 14651 y lasegunda generando una pequeña variación a ésta, la cual consiste en no realizar la entallaque especifica la norma, a fin de analizar los datos obtenidos y determinar el grado deimportancia de la variante mencionada.
Over recent years, the study of fiber reinforced concrete (FRC) has increasedinorder to make use the advantages and improvements that presents the constructive level insome circumstances. Within our country it has increased the use of FRC, considering thatby incorporating fibers at the time of mixing, related to the increase of the qualities againstbending, cracking and traction among other benefits are obtained; the uses that have beengiven to the FRC are diverse, ranging from reinforcing tunnels (shotcrete) to prefabricatedelements.Currently and conventionally, the properties and behavior of fiber reinforcedconcrete have been characterized and evaluated by flexural tests with loads thirds, howeverthe accuracy and precision of these has been questioned because of the high dispersion inthe results, which can be generated by loss of control of the trial at the time of cracking,cracking out of the plane load, among others.In order to address the different experimental problems found in testing, researchamong several laboratories where it is proposed for FRC, a bending test on a beam withcentral notch and loaded in the center of the light is developed, the which it was laterstandardized in Europe by EN 14651, a standard that determines the parameters used by theModel Code Eurointernacional Concrete Committee (CEB) for the structural design ofelements of FRC.Considering the above, through herein intends to develop an experimental campaignto characterize the properties of concrete reinforced with steel fibers (SFRC) by the testspecified in EN 14651.In order to characterize and evaluate the performance of fiber reinforced concrete,prismatic specimens, which will be tested later in two ways will be drawn, the first asspecified in EN 14651 and the second generating a slight variation to this, the which is notperforming the kerf that specifies the standard, in order to analyze the data and determinethe degree of importance of said variant.
Over recent years, the study of fiber reinforced concrete (FRC) has increasedinorder to make use the advantages and improvements that presents the constructive level insome circumstances. Within our country it has increased the use of FRC, considering thatby incorporating fibers at the time of mixing, related to the increase of the qualities againstbending, cracking and traction among other benefits are obtained; the uses that have beengiven to the FRC are diverse, ranging from reinforcing tunnels (shotcrete) to prefabricatedelements.Currently and conventionally, the properties and behavior of fiber reinforcedconcrete have been characterized and evaluated by flexural tests with loads thirds, howeverthe accuracy and precision of these has been questioned because of the high dispersion inthe results, which can be generated by loss of control of the trial at the time of cracking,cracking out of the plane load, among others.In order to address the different experimental problems found in testing, researchamong several laboratories where it is proposed for FRC, a bending test on a beam withcentral notch and loaded in the center of the light is developed, the which it was laterstandardized in Europe by EN 14651, a standard that determines the parameters used by theModel Code Eurointernacional Concrete Committee (CEB) for the structural design ofelements of FRC.Considering the above, through herein intends to develop an experimental campaignto characterize the properties of concrete reinforced with steel fibers (SFRC) by the testspecified in EN 14651.In order to characterize and evaluate the performance of fiber reinforced concrete,prismatic specimens, which will be tested later in two ways will be drawn, the first asspecified in EN 14651 and the second generating a slight variation to this, the which is notperforming the kerf that specifies the standard, in order to analyze the data and determinethe degree of importance of said variant.
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Keywords
CARACTERIZACION DE HORMIGONES , EN 14651 , HRFA