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  • Constitutive model for fibre reinforced concrete based on the Barcelona test

     Blanco Álvarez, Ana; Pujadas Alvarez, Pablo; Pialarissi Cavalaro, Sergio Henrique; de la Fuente Antequera, Alberto; Aguado De Cea, Antonio
    Cement & concrete composites
    Vol. 53, p. 327-340
    DOI: 10.1016/j.cemconcomp.2014.07.017
    Date of publication: 2014-10-01
    Journal article

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    Several constitutive models for fibre reinforced concrete (FRC) have been reported in the past years based on the flexural performance obtained in a bending test. The Barcelona test was presented as an alternative to characterise the tensile properties of FRC; however, no constitutive model was derived from it. In this article, a formulation to predict the tensile behaviour of FRC is developed based on the results of the Barcelona test. The constitutive model proposed is validated by simulating the results of an experimental program involving different types of fibres and fibre contents by means of finite element software. More-over, the simplified formulation proposed is compared with constitutive models from European codes and guidelines

    Several constitutive models for fibre reinforced concrete (FRC) have been reported in the past years based on the flexural performance obtained in a bending test. The Barcelona test was presented as an alternative to characterise the tensile properties of FRC; however, no constitutive model was derived from it. In this article, a formulation to predict the tensile behaviour of FRC is developed based on the results of the Barcelona test. The constitutive model proposed is validated by simulating the results of an experimental program involving different types of fibres and fibre contents by means of finite element software. More-over, the simplified formulation proposed is compared with constitutive models from European codes and guidelines

  • Plastic fibres as the only reinforcement for flat suspended slabs: parametric study and design considerations

     Pujadas Alvarez, Pablo; Blanco Álvarez, Ana; Pialarissi Cavalaro, Sergio Henrique; Aguado De Cea, Antonio; Grünewald, Steffen; Blom, CBM; Walraven, Joost C
    Construction & building materials
    Vol. 2014, num. 70, p. 88-96
    DOI: 10.1016/j.conbuildmat.2014.07.091
    Date of publication: 2014-11-15
    Journal article

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    The use of constitutive equations from the standards to model flat suspended slabs reinforced only with plastic fibres leads to an overestimation of the experimental response of these elements. To address such problem, a parametric study is conducted. In this study, the influence of the parameters from the constitutive equations on the structural behaviour of the slabs is analysed and the ones that provide the best fit with the experimental results are found through a non-linear regression. Based on this analysis, the existence of a network effect was identified and a design philosophy for suspended slabs reinforced only with plastic fibres is proposed. Thereby, this paper represents a meaningful contribution to provide a step towards the development of a rational and design-oriented constitutive model for real-scale hyperstatic slabs-type elements

    The use of constitutive equations from the standards to model flat suspended slabs reinforced only with plastic fibres leads to an overestimation of the experimental response of these elements. To address such problem, a parametric study is conducted. In this study, the influence of the parameters from the constitutive equations on the structural behaviour of the slabs is analysed and the ones that provide the best fit with the experimental results are found through a non-linear regression. Based on this analysis, the existence of a network effect was identified and a design philosophy for suspended slabs reinforced only with plastic fibres is proposed. Thereby, this paper represents a meaningful contribution to provide a step towards the development of a rational and design-oriented constitutive model for real-scale hyperstatic slabs-type elements

  • Methodology for the design of controlled low-strength materials: application to the backfill of narrow trenches

     Blanco Álvarez, Ana; Pujadas Alvarez, Pablo; Pialarissi Cavalaro, Sergio Henrique; Aguado De Cea, Antonio
    Construction & building materials
    Vol. 72, p. 23-30
    DOI: 10.1016/j.conbuildmat.2014.09.008
    Date of publication: 2014-12
    Journal article

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    The design of controlled low-strength materials (CLSM) is generally based on experimental approaches without considering an efficient use of the component materials. The present study proposes a general methodology for the design of optimised CLSM that includes the definition of the mechanical requirements through numerical simulations with FEM and an experimental procedure to define the mix by optimising the aggregate skeleton, the content of cement and the use of admixtures and additions. Moreover, the methodology is applied to the backfill of narrow trenches.

    The design of controlled low-strength materials (CLSM) is generally based on experimental approaches without considering an efficient use of the component materials. The present study proposes a general methodology for the design of optimised CLSM that includes the definition of the mechanical requirements through numerical simulations with FEM and an experimental procedure to define the mix by optimising the aggregate skeleton, the content of cement and the use of admixtures and additions. Moreover, the methodology is applied to the backfill of narrow trenches.

  • Fibre distribution in macro-plastic fibre reinforced concrete slab-panels

     Pujadas Alvarez, Pablo; Blanco Álvarez, Ana; Pialarissi Cavalaro, Sergio Henrique; de la Fuente Antequera, Alberto; Aguado De Cea, Antonio
    Construction & building materials
    num. 64, p. 496-503
    DOI: 10.1016/j.conbuildmat.2014.04.067
    Date of publication: 2014-08-14
    Journal article

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    This paper focuses on the study of the influence of flowability and wall-effects of the formwork in the orientation pattern of macro-plastic fibres. In order to identify the preferential orientation of fibres caused by the geometry of slabs, pairs of specimens drilled from PFRC slabs with different width/length ¿ ratio are tested using the multidirectional double punch test (MDPT). The results show that plastic fibres tend to be oriented parallel to the walls or surfaces of the formwork and perpendicular to the flow direction for a free surface flow. The side walls slightly redistribute the fibre orientation, as the transverse dimension of the slabs is reduced. Additionally, a computed tomography (CT-scans) was, for the first time, successfully applied to assess the amount of macro-plastic fibres as well as its distribution and orientation in a prismatic core.

    This paper focuses on the study of the influence of flowability and wall-effects of the formwork in the orientation pattern of macro-plastic fibres. In order to identify the preferential orientation of fibres caused by the geometry of slabs, pairs of specimens drilled from PFRC slabs with different width/length – ratio are tested using the multidirectional double punch test (MDPT). The results show that plastic fibres tend to be oriented parallel to the walls or surfaces of the formwork and perpendicular to the flow direction for a free surface flow. The side walls slightly redistribute the fibre orientation, as the transverse dimension of the slabs is reduced. Additionally, a computed tomography (CT-scans) was, for the first time, successfully applied to assess the amount of macro-plastic fibres as well as its distribution and orientation in a prismatic core.

  • Desarrollo de mejores rehabilitaciones locales en infraestructuras (MERLIN)

     Pialarissi Cavalaro, Sergio Henrique; Blanco Álvarez, Ana; de la Fuente Antequera, Alberto; Aguado De Cea, Antonio
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  • Plastic fibres as the only reinforcement for flat suspended slabs: Experimental investigation and numerical simulation

     Pujadas Alvarez, Pablo; Blanco Álvarez, Ana; Pialarissi Cavalaro, Sergio Henrique; Aguado De Cea, Antonio
    Construction & building materials
    Vol. 57, p. 92-104
    DOI: 10.1016/j.conbuildmat.2014.01.082
    Date of publication: 2014-01-27
    Journal article

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    This paper focuses on the study of the structural response of hyperstatic concrete flat suspended slabs reinforced only with structural plastic macro-fibres. First, the experimental program is described and then the results obtained are presented. The slabs tested maintained a high load level after cracking showing a ductile behaviour with great stress redistribution capacity. Next, the tests were simulated by means of a finite element software with constitutive models according to the specifications of RILEM and the Spanish Structural Concrete Code (EHE). The numerical results in terms of load/mid-span deflection were compared with the experimental results. The predictions provided by the codes and guideline models clearly overestimated the experimental results, which suggests the need to review the constitutive models used for plastic fibre-reinforced concrete

    This paper focuses on the study of the structural response of hyperstatic concrete flat suspended slabs reinforced only with structural plastic macro-fibres. First, the experimental program is described and then the results obtained are presented. The slabs tested maintained a high load level after cracking showing a ductile behaviour with great stress redistribution capacity. Next, the tests were simulated by means of a finite element software with constitutive models according to the specifications of RILEM and the Spanish Structural Concrete Code (EHE). The numerical results in terms of load/mid-span deflection were compared with the experimental results. The predictions provided by the codes and guideline models clearly overestimated the experimental results, which suggests the need to review the constitutive models used for plastic fibre-reinforced concrete

  • Multidirectional double punch test to assess the post-cracking behaviour and fibre orientation of FRC

     Pujadas Alvarez, Pablo; Blanco Álvarez, Ana; Pialarissi Cavalaro, Sergio Henrique; de la Fuente Antequera, Alberto; Aguado De Cea, Antonio
    Construction & building materials
    Vol. 58, p. 214-224
    DOI: 10.1016/j.conbuildmat.2014.02.023
    Date of publication: 2014-05-15
    Journal article

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    The wide variety of tests currently used for the characterization of fibre reinforced concrete (FRC) only allow a unidirectional characterization (without considering the orientation of the fibres in the matrix). However, from a design-oriented perspective, the anisotropy due to the dispersion and orientation of fibres has to be taken into account when characterizing the mechanical behaviour of the material. In this paper, an alternative to the conventional tests applied for the characterization of FRC is proposed. The multidirectional double punch test (MDPT) consists of a double punch test applied to a cubic specimen. Due to the specimen shape in a single procedure an estimation of the fibre orientation efficiency can be obtained, establishing a link between the mechanical properties of FRC with the fibre orientation. Thereby, this paper represents a meaningful contribution to provide a step towards the development of a rational and design-oriented constitutive model for real-scale structures.

    The wide variety of tests currently used for the characterization of fibre reinforced concrete (FRC) only allow a unidirectional characterization (without considering the orientation of the fibres in the matrix). However, from a design-oriented perspective, the anisotropy due to the dispersion and orientation of fibres has to be taken into account when characterizing the mechanical behaviour of the material. In this paper, an alternative to the conventional tests applied for the characterization of FRC is proposed. The multidirectional double punch test (MDPT) consists of a double punch test applied to a cubic specimen. Due to the specimen shape in a single procedure an estimation of the fibre orientation efficiency can be obtained, establishing a link between the mechanical properties of FRC with the fibre orientation. Thereby, this paper represents a meaningful contribution to provide a step towards the development of a rational and design-oriented constitutive model for real-scale structures.

  • Dovelas de hormigón prefabricado reforzado con fibras para el soporte de túneles y pozos verticales

     de la Fuente Antequera, Alberto; Blanco Álvarez, Ana; Pujadas Alvarez, Pablo; Aguado De Cea, Antonio
    Congreso de la Asociación Científico-Técnica del Hormigón Estructural
    p. 233
    Presentation's date: 2014-06-04
    Presentation of work at congresses

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  • Correlación entre TCOD y desplazamiento axial en el ensayo Barcelona

     Pujadas Alvarez, Pablo; Blanco Álvarez, Ana; Pialarissi Cavalaro, Sergio Henrique; de la Fuente Antequera, Alberto; Aguado De Cea, Antonio
    Congreso de la Asociación Científico-Técnica del Hormigón Estructural
    p. 1/10-10/10
    Presentation's date: 2014-06-04
    Presentation of work at congresses

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    La necesidad de medir el desplazamiento circunferencial (total circumferential opening displacemento TCOD ) en el ensayo Barcelona implica el uso de un caro extensómetro circunferencial. El modelo desarrollado en la presente comunicación permite una positiva simplificación elimina la necesidad de utilizar la cadena extensométrica mediante la estimación directa del TCOD a partir del desplazamiento axial (d). Además las ecuaciones desarrolladas en este artículo proporcionan una clara comprensión de los mecanismos físicos que gobiernan el ensayo Barcelona. La comparación con los valores experimentales indica que el m odelo es capaz de predecir con un buen ajuste la curva entera carga-TCOD, independientemente del tipo de hormigón (convencional HRF o alta resistencia UHPFRC), del tipo de fibra (acero o plásticas, micro o macro) y el comportamiento postfisuración (hardening o softening).

    La necesidad de medir el desplazamiento circunferencial (total circumferential opening displacemento TCOD ) en el ensayo Barcelona implica el uso de un caro extensómetro circunferencial. El modelo desarrollado en la presente comunicación permite una positiva simplificación elimina la necesidad de utilizar la cadena extensométrica mediante la estimación directa del TCOD a partir del desplazamiento axial (δ). Además las ecuaciones desarrolladas en este artículo proporcionan una clara comprensión de los mecanismos físicos que gobiernan el ensayo Barcelona. La comparación con los valores experimentales indica que el m odelo es capaz de predecir con un buen ajuste la curva entera carga-TCOD, independientemente del tipo de hormigón (convencional HRF o alta resistencia UHPFRC), del tipo de fibra (acero o plásticas, micro o macro) y el comportamiento postfisuración (hardening o softening).

  • Comportamiento a flexión de losas de hormigón reforzado con fibras (HRF)

     Blanco Álvarez, Ana; Pujadas Alvarez, Pablo; de la Fuente Antequera, Alberto; Pialarissi Cavalaro, Sergio Henrique; Aguado De Cea, Antonio
    Congreso de la Asociación Científico-Técnica del Hormigón Estructural
    p. 41
    Presentation's date: 2014-06-05
    Presentation of work at congresses

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  • Desarrollo de mejores rehabilitaciones locales en infraestructuras (MERLIN)

     Pialarissi Cavalaro, Sergio Henrique; Blanco Álvarez, Ana; de la Fuente Antequera, Alberto; Aguado De Cea, Antonio
    Competitive project

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  • Characterization and modelling of SFRC elements  Open access

     Blanco Álvarez, Ana
    Department of Construction Engineering, Universitat Politècnica de Catalunya
    Theses

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    El uso de hormigón reforzado con fibras (HRF) como material de construcción se ha expandido más allá de las aplicaciones tradicionales desde la publicación de códigos y recomendaciones de diseño. De hecho, la industria está demandando HRF con creciente responsabilidad estructural y, en algunos casos, con las fibras cómo único material de refuerzo. A pesar de los notables avances en la tecnología de refuerzo con fibras y la publicación de recomendaciones de diseño, continúan surgiendo preguntas con respecto al comportamiento, la caracterización y el diseño del material. La definición del modelo constitutivo del HRF y el desarrollo de métodos de caracterización han sido ampliamente estudiados, sin embargo, su idoneidad para ciertas aplicaciones estructurales sigue suscitando debate. Asimismo, propiedades tales como la orientación de las fibras y las deformaciones por fluencia no son aspectos menores y necesitan ser considerados adecuadamente. Con el fin de trabajar hacia un procedimiento de diseño preciso y eficiente, los citados temas deben ser ampliamente estudiados.En este contexto, el interés de la industria por comprender mejor el comportamiento del HRF ha generado la posibilidad de realizar ensayos a pequeña escala y a escala real que son una valiosa fuente de información. Por este motivo, se plantea una tesis doctoral generalista que abarca varios temas referentes a la caracterización y diseño del hormigón reforzado con fibras de acero (HRFA). Los temas tratados en esta investigación son: el comportamiento a flexión y el diseño de vigas con refuerzo combinado de fibras y barras de acero; el comportamiento a flexión, la orientación de fibras y el diseño de losas de HRFA con diferentes dimensiones; la predicción del comportamiento a tracción del HRFA y el comportamiento y la fluencia del HRFA en estado fisurado. El primer tema analiza la idoneidad de los actuales modelos constitutivos propuestos en los códigos y recomendaciones europeos para simular el comportamiento a flexión de vigas con refuerzo combinado. Para ello, se han ensayado elementos a escala real con diferentes tipos y contenidos de fibras de acero. Los resultados de la modelización numérica demostraron que, en general, dichos modelos constitutivos reproducen satisfactoriamente los datos experimentales.En el segundo tema, con base en el comportamiento a flexión de losas de HRFA a escala real, se proponen factores geométricos con el fin de compensar las inexactitudes de los actuales modelos constitutivos para reproducir la respuesta de este tipo de elementos. El estudio relativo a la modelización del comportamiento a flexión de las losas permitió identificar un efecto favorable de la orientación de las fibras (efecto de la red de las fibras) que se acentúa con el ancho de las losas.El tercer tema se centra en la propuesta de una formulación analítica para estimar la curva tensión-deformación a tracción del HRF a partir de los resultados del ensayo Barcelona. La validación realizada indica la aplicabilidad del modelo tanto para hormigones con fibras de acero como con fibras plásticas.El último tema trata la deformación por fluencia del HRFA en estado fisurado, evaluadas mediante la realización ensayos a flexión bajo carga sostenida en vigas a pequeña escala pre-fisuradas. Con base en los resultados, se propone un modelo simple para predecir la evolución del coeficiente de fluencia en el tiempo.

    The use of fibre reinforced concrete (FRC) as a construction material has expanded beyond the traditional applications since the publication of design codes and guidelines. In fact, the industry is demanding FRC with increasing structural responsibilities and, in some cases, with the fibres as the only reinforcement. Despite the remarkable advances in the fibre reinforcement technology and the publication of design guidelines, questions continue to arise regarding the performance, the characterization and the modelling of the material. The definition of the constitutive model of FRC and the development of methods for the characterization have been extensively studied. However, their adequacy for certain applications still remains an issue. Moreover, properties such as the fibre orientation and the creep behaviour are not minor concerns and need to be properly considered. These subjects require further research in order to work towards an accurate and efficient design procedure. In this context, the great interest of the industry to understand better FRC behaviour has created the opportunity of performing small-scale and real-scale tests that are a valuable source of information. Therefore, a rather generalist doctoral thesis covering several subjects about the characterization and modelling of steel fibre reinforced concrete (SFRC) elements is proposed. The subjects addressed in this research refer to the flexural behaviour and modelling of RC-SFRC beams (beams with combined reinforcement of steel fibres and rebars); the flexural behaviour, fibre orientation and modelling of SFRC slabs with changing dimensions; the prediction of the tensile behaviour of SFRC and the post-cracking creep behaviour of SFRC. The first subject concerns the adequacy of the constitutive models proposed in the current European codes and guidelines to model the flexural response of RC-SFRC beams. For that, real-scale elements with different steel fibres and fibre contents were tested. The results of the numerical modelling show that, in general, these constitutive models reproduce satisfactorily the experimental data. In the second subject, based on the flexural behaviour of real-scale SFRC slabs, geometry factors are proposed to compensate for the inaccuracies of the current constitutive models to reproduce the response of such elements. The study conducted on the modelling of the flexural behaviour of the slabs allowed identifying a favourable effect of the fibre orientation (fibre network effect) as the width of the slabs increased. The third subject covers a proposal of an analytical formulation to estimate the tensile stress-strain diagram of FRC from the results of the Barcelona test. The validation performed indicates the applicability of the new model to concrete with either steel fibres or plastic fibres. The last subject focuses on the post-cracking creep behaviour of SFRC, which is assessed by performing flexural tests under sustained load on pre-cracked small-scale beams. Based on the results, a simple model to predict the evolution of the creep coefficient with time is proposed.

  • New analytical model to generalize the Barcelona Test using axial displacement

     Pujadas Alvarez, Pablo; Blanco Álvarez, Ana; Pialarissi Cavalaro, Sergio Henrique; de la Fuente Antequera, Alberto; Aguado De Cea, Antonio
    Journal of civil engineering and management (Spausdinta)
    Vol. 19, num. 2, p. 259-271
    DOI: 10.3846/13923730.2012.756425
    Date of publication: 2013
    Journal article

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    The Barcelona Test has proved to be very suitable for the systematic control of the tensile properties of Fibre Reinforced Concrete (FRC). Nevertheless, the need to measure the total circumferential opening displacement (TCOD) of the specimen entails the use of an expensive circumferential extensometer. In order to simplify the test, studies from the literature propose the use of the axial displacement of the press (d) instead of the TCOD, obtaining empirical equations to correlate the energy estimated with both measurements. However, these equations are only valid for d ranging from 1 to 4 mm and were adjusted based on the test results of just a few types of FRC. The verification of this formulation for other types of FRC shows an average error of 51.1%, thus limiting the simplification proposed for the test. In this paper, a new analytical model to convert the d into the TCOD is developed and validated for a wide range of FRC. Besides being applicable to the whole range of d, the new model provides a clear physical understanding of the main mechanism observed during the test and shows an average error of only 6.7%, making it possible to simplify the Barcelona test.

    The Barcelona Test has proved to be very suitable for the systematic control of the tensile properties of Fibre Reinforced Concrete (FRC). Nevertheless, the need to measure the total circumferential opening displacement (TCOD) of the specimen entails the use of an expensive circumferential extensometer. In order to simplify the test, studies from the literature propose the use of the axial displacement of the press (δ) instead of the TCOD, obtaining empirical equations to correlate the energy estimated with both measurements. However, these equations are only valid for δ ranging from 1 to 4 mm and were adjusted based on the test results of just a few types of FRC. The verification of this formulation for other types of FRC shows an average error of 51.1%, thus limiting the simplification proposed for the test. In this paper, a new analytical model to convert the δ into the TCOD is developed and validated for a wide range of FRC. Besides being applicable to the whole range of δ, the new model provides a clear physical understanding of the main mechanism observed during the test and shows an average error of only 6.7%, making it possible to simplify the Barcelona test.

  • Application of constitutive models in European codes to RC-FRC

     Blanco Álvarez, Ana; Pujadas Alvarez, Pablo; de la Fuente Antequera, Alberto; Pialarissi Cavalaro, Sergio Henrique; Aguado De Cea, Antonio
    Construction & building materials
    Vol. 40, p. 246-259
    DOI: 10.1016/j.conbuildmat.2012.09.096
    Date of publication: 2013-03
    Journal article

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    The recent publication of codes for the design of FRC is a major step towards extending the use of the material. An in depth analysis indicates several differences between the constitutive models proposed in the existing codes. In this study, these models are compared and a numerical simulation is performed to evaluate their differences in terms of the structural behavior predicted and measured in an experimental program of RC-FRC elements. The predictions provided by the models fit satisfactorily the experimental results for elements with steel fibers and with plastic fibers

  • Experimental analysis of the flexural behavior of FRC+RC beams

     Pujadas Alvarez, Pablo; Blanco Álvarez, Ana; Pialarissi Cavalaro, Sergio Henrique; de la Fuente Antequera, Alberto; Aguado De Cea, Antonio; Soares Klein, Nayara
    Congresso Brasileiro do Concreto
    p. 1-15
    Presentation's date: 2013-10-29
    Presentation of work at congresses

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    La acción de las armaduras convencionales y de las fibras es complementaria a efectos de evitar la rotura frágil del hormigón. Las fibras, en tipo y cuantía adecuada, garantizan una clara responsabilidad estructural. Éstas, al añadirse al hormigón se dispersan en su volumen y confieren a dicha matriz un armado en tres dimensiones. Ello repercute en un incremento de la tenacidad y, por ende, un mejor control de la fisuración pues, contrariamente a lo que sucede con un armado convencional, las fibras trabajan en todo el bloque traccionado. En este sentido, la combinación de fibras y armadura convencional se presenta como una solución estructural y económicamente competitiva en el diseño de estructuras. En estas configuraciones mixtas (armado convencional y fibras), el armado convencional aporta en gran medida la capacidad resistente, sin embargo, gracias a la contribución estructural de las fibras, las cuantías de armado convencional necesarias pueden ser significativamente reducidas. Además, las fibras contribuyen, sin duda, a reducir los costes y problemas asociados de la manipulación de ferralla (traslado, doblado, soldaduras, colocación de separadores, entre otros), economizando tiempo y reduciendo los accidentes laborales derivados de este tipo de montajes. En los últimos años se han realizado numerosas investigaciones en la línea de sustituir total o parcialmente el armado tradicional del hormigón por fibras. Sin embargo, existe un gran desconocimiento e incertidumbre sobre el comportamiento a flexión de elementos tipo viga reforzados con armadura convencional y macro-fibras plásticas estructurales, de las que no existe actualmente investigación al respecto. En este trabajo se aborda el análisis de la solución anteriormente mencionada a través del estudio de los estados límite último y de servicio. Para ello, un total de 10 losas (3 x 1 x 0,2 m) de hormigón fueron producidos con diferentes configuraciones de refuerzo, tipos de fibras (acero y plásticas) y la dosificación de fibra utilizada (0.25% y 0,50%). Estas losas se ensayaron bajo la configuración de un ensayo a flexión de cuatro puntos.

    La acción de las armaduras convencionales y de las fibras es complementaria a efectos de evitar la rotura frágil del hormigón. Las fibras, en tipo y cuantía adecuada, garantizan una clara responsabilidad estructural. Éstas, al añadirse al hormigón se dispersan en su volumen y confieren a dicha matriz un armado en tres dimensiones. Ello repercute en un incremento de la tenacidad y, por ende, un mejor control de la fisuración pues, contrariamente a lo que sucede con un armado convencional, las fibras trabajan en todo el bloque traccionado. En este sentido, la combinación de fibras y armadura convencional se presenta como una solución estructural y económicamente competitiva en el diseño de estructuras. En estas configuraciones mixtas (armado convencional y fibras), el armado convencional aporta en gran medida la capacidad resistente, sin embargo, gracias a la contribución estructural de las fibras, las cuantías de armado convencional necesarias pueden ser significativamente reducidas. Además, las fibras contribuyen, sin duda, a reducir los costes y problemas asociados de la manipulación de ferralla (traslado, doblado, soldaduras, colocación de separadores, entre otros), economizando tiempo y reduciendo los accidentes laborales derivados de este tipo de montajes. En los últimos años se han realizado numerosas investigaciones en la línea de sustituir total o parcialmente el armado tradicional del hormigón por fibras. Sin embargo, existe un gran desconocimiento e incertidumbre sobre el comportamiento a flexión de elementos tipo viga reforzados con armadura convencional y macro-fibras plásticas estructurales, de las que no existe actualmente investigación al respecto. En este trabajo se aborda el análisis de la solución anteriormente mencionada a través del estudio de los estados límite último y de servicio. Para ello, un total de 10 losas (3 x 1 x 0,2 m) de hormigón fueron producidos con diferentes configuraciones de refuerzo, tipos de fibras (acero y plásticas) y la dosificación de fibra utilizada (0.25% y 0,50%). Estas losas se ensayaron bajo la configuración de un ensayo a flexión de cuatro puntos.

  • Incorporación del hormigón reforzado con fibras en el programa de un curso de estructuras de hormigón

     Pujadas Alvarez, Pablo; de la Fuente Antequera, Alberto; Blanco Álvarez, Ana; Aguado De Cea, Antonio
    Jornadas Internacionales de Enseñanza de la Ingeniería Estructural
    p. 347-354
    Presentation's date: 2013-06-12
    Presentation of work at congresses

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  • Advances on the use of fibres in precast concrete segmental linings

     de la Fuente Antequera, Alberto; Blanco Álvarez, Ana; Pujadas Alvarez, Pablo; Aguado De Cea, Antonio
    Engineering a Concrete Futrue: Technology, Modeling & Construction
    p. 691-694
    Presentation's date: 2013-04-22
    Presentation of work at congresses

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  • Fibre orientation in SFRC slabs

     Blanco Álvarez, Ana; Pujadas Alvarez, Pablo; de la Fuente Antequera, Alberto; Pialarissi Cavalaro, Sergio Henrique; Aguado De Cea, Antonio
    International Conference Fibre Concrete
    p. 1-8
    Presentation's date: 2013-09-12
    Presentation of work at congresses

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  • Analytical model for the generalization of the Barcelona test by using the axial displacement to determine the toughness of the FRC

     Pujadas Alvarez, Pablo; Blanco Álvarez, Ana; Pialarissi Cavalaro, Sergio Henrique; de la Fuente Antequera, Alberto; Aguado De Cea, Antonio
    International Conference Fibre Concrete
    p. 1-9
    Presentation's date: 2013-09
    Presentation of work at congresses

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  • Improved quality control system for FRC

     Aguado De Cea, Antonio; de la Fuente Antequera, Alberto; Blanco Álvarez, Ana; Pialarissi Cavalaro, Sergio Henrique; Pujadas Alvarez, Pablo
    Date: 2012-11-05
    Report

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  • Monografías Técnicas Cemex: hormigón con fibras

     Aguado De Cea, Antonio; de la Fuente Antequera, Alberto; Blanco Álvarez, Ana; Pujadas Alvarez, Pablo
    Date: 2012
    Report

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  • Cracking behavior of FRC slabs with traditional reinforcement

     Pujadas Alvarez, Pablo; Blanco Álvarez, Ana; de la Fuente Antequera, Alberto; Aguado De Cea, Antonio
    Materials and structures
    Vol. 45, num. 5, p. 707-725
    DOI: 10.1617/s11527-011-9791-0
    Date of publication: 2012-04-02
    Journal article

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    The combination of fibers with traditional reinforcement may be a very interesting design solution to achieve more durable and economical structures. This paper deals with the analysis of the aforementioned solution through the study at serviceability and ultimate limit states. For this purpose, a total of eighteen concrete slabs were produced (3x1x0.2 m) with different reinforcement configurations, types of fibers (steel and plastic) and the fiber dosage used (0.25 and 0.50%). These slabs were tested under the configuration of a four point bending test. The results of this experimental campaign were used in the study of the cracking and deflection of the various types of concrete, tackling the analysis from several points of view.

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  • Experiences in Barcelona with the use of fibres in segmental linings

     de la Fuente Antequera, Alberto; Pujadas Alvarez, Pablo; Blanco Álvarez, Ana; Aguado De Cea, Antonio
    Tunnelling and underground space technology
    Vol. 27, num. 1, p. 60-71
    DOI: 10.1016/j.tust.2011.07.001
    Date of publication: 2012-01
    Journal article

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    This paper presents the most outstanding experiences regarding the use of fibres as the main reinforcement in precast segmental linings in the metropolitan area of Barcelona. It is known that the addition of structural fibres improves, on the one hand, the mechanical behaviour of the structure during its construction, especially in cases such as the thrust of the jacks, and on the other hand it leads to a reduction of the global costs by reducing the conventional passive reinforcement. The aim of this paper consists in presenting three real experiences that are representative of the application of FRC in urban tunnels and a design methodology to take into account the structural contribution of the fibres. Two particular cases of the application of this design method are presented. In the first case, the use of 25 kg/m3 of fibres has led to a reduction of 70% of the conventional reinforcement initially proposed in the project. In the second one, which was planned to employ fibres but without considering its structural contribution, the parametric study reflected the possibility of reducing up to a 38% of the rebars adding 25 kg/m3 of steel fibres in the concrete mixture. In light of good results, construction companies in Spain have become aware of the advantages of using fibres in these structures and have carried out experimental stretches. This attitude has also been influenced by the approval of the new Spanish Code, which includes the FRC as a construction material with design purposes.

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  • Inductive method for assessing the amount and orientation of steel fibers in concrete

     Torrents Dolz, Josep Maria; Blanco Álvarez, Ana; Pujadas Alvarez, Pablo; Aguado De Cea, Antonio; Juan-García, Pau; Sánchez-Moragues, Miguel Ángel
    Materials and structures
    Vol. 45, num. 10, p. 1577-1592
    DOI: 10.1617/s11527-012-9858-6
    Date of publication: 2012-04-24
    Journal article

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    Steel fibers are ferromagnetic and they have the property of altering the magnetic field around them. This paper discusses a method and gives a practical example to measure, non-destructively, the amount and orientation of fibers from cubic concrete specimens (150 mm). This is possible because the fibers affect inductance of a sensor (an inductive coil) that is wrapped around the specimen.

  • Comparative analysis of constitutive models of fibre reinforced concrete

     Pujadas Alvarez, Pablo; Blanco Álvarez, Ana; de la Fuente Antequera, Alberto; Pialarissi Cavalaro, Sergio Henrique; Aguado De Cea, Antonio
    Congresso Brasileiro do Concreto
    p. 1-16
    Presentation's date: 2012-10-09
    Presentation of work at congresses

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  • Metodología para el diseño óptimo de dovelas de hormigón reforzado con fibras

     de la Fuente Antequera, Alberto; Pujadas Alvarez, Pablo; Blanco Álvarez, Ana; Aguado De Cea, Antonio
    Congresso Brasileiro de Túneis e Estruturas Subterrâneas
    p. 1-10
    Presentation's date: 2012-03-21
    Presentation of work at congresses

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    En este trabajo se presentan una de las experiencias más relevantes relativas al uso de fibras estructurales como refuerzo del hormigón substitución prácticamente toda la armadura pasiva tradicional en dovelas para anillos de revestimiento en el área metropolitana de Barcelona. Es conocido, que la adición de fibras estructurales mejora, por una parte, la respuesta estructural del elemento durante su construcción, especialmente durante la acción del empuje de los gatos, y, por otra parte, conduce a reducciones globales de los costes en virtud de la disminución de la cuantía de armadura pasiva tradicional que se produce. El objetivo de este trabajo consiste en exponer uno de los varios casos reales de aplicación de esta tecnología en túneles urbanos así como el método de diseño implementado para tener en cuenta la contribución de las fibras a nivel seccional. El caso que se presenta, en particular, ha permitido reducir hasta un 70% de la armadura pasiva convencional mediante el empleo de 25 kg/m3 de fibras metálicas. A la luz de este buen resultado, así como de la robustez del método de diseño propuesto, varias compañías de prefabricación españolas de dovelas para túneles se han interesado por este sistema así como de las ventajas que aparecen fruto del uso de fibras en este tipo de elementos. Esta actitud positiva e innovadora ha sido fuertemente influenciada por la aprobación de la nueva Instrucción de Hormigón Estructural española (EHE-08), la cual incluye un anejo (Anejo 14. Recomendaciones para la utilización de hormigón con fibras) en la que se regula y se exponen las bases de diseño, fabricación y control de elementos de hormigón reforzado con fibras.

  • Recent methods for the characterization of fiber reinforced concrete

     Blanco Álvarez, Ana; Pujadas Alvarez, Pablo; Pialarissi Cavalaro, Sergio Henrique; de la Fuente Antequera, Alberto; Aguado De Cea, Antonio
    Congresso Brasileiro do Concreto
    p. 1-16
    Presentation's date: 2012-10-11
    Presentation of work at congresses

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  • Método inductivo para la evaluación de cuantía y orientación de fibras de acero en hormigón

     Blanco Álvarez, Ana; Torrents Dolz, Josep Maria; Pujadas Alvarez, Pablo; Aguado De Cea, Antonio
    Congreso de la Asociación Científico-Técnica del Hormigón Estructural
    p. 285-286
    Presentation's date: 2011-10
    Presentation of work at congresses

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  • Procesos constructivos mediante hormigones reforzados con fibras

     Blanco Álvarez, Ana; Agulló Fité, Luís; Pujadas Alvarez, Pablo; Segura Castillo, Luis; Manso Blanco, Sandra; de la Fuente Antequera, Alberto
    Competitive project

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  • Metodo para la evaluación de la contribución estructural de las fibras en función de su orientación

     Pujadas Alvarez, Pablo; Pialarissi Cavalaro, Sergio Henrique; Blanco Álvarez, Ana; Aguado De Cea, Antonio
    Congreso de la Asociación Científico-Técnica del Hormigón Estructural
    p. 289-290
    Presentation's date: 2011-10
    Presentation of work at congresses

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  • Programa de trabajo para el proyecto PERMASTOP

     Aguado De Cea, Antonio; Blanco Álvarez, Ana; de la Fuente Antequera, Alberto; Pujadas Alvarez, Pablo
    Date: 2010-08-04
    Report

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  • Viabilidad del empleo de una capa de hormigón con fibras en pantallas

     Aguado De Cea, Antonio; Pujadas Alvarez, Pablo; de la Fuente Antequera, Alberto; Blanco Álvarez, Ana
    Date: 2010-08-04
    Report

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  • Plan de trabajo para la instrumentación de pantallas

     Aguado De Cea, Antonio; Blanco Álvarez, Ana; de la Fuente Antequera, Alberto; Pujadas Alvarez, Pablo
    Date: 2010-11-02
    Report

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  • Análisis comparativo de los modelos constitutivos del hormigón reforzado con fibras

     Blanco Álvarez, Ana; Pujadas Alvarez, Pablo; de la Fuente Antequera, Alberto; Aguado De Cea, Antonio
    Hormigon y acero
    Vol. 61, num. 256, p. 83-101
    Date of publication: 2010-04
    Journal article

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    La aparición de normas específicas para el empleo del Hormigón Reforzado con Fibras es, sin lugar a duda, una herramienta clave que proporciona al proyectista un mayor margen de confianza como solución estructural. Actualmente existen numerosas directrices y recomendaciones normativas que definen las bases de cálculo de este material, lo que a su vez supone una gran oportunidad para extender su uso. Por ello, en este artículo, se ha realizado un análisis detallado de los principales modelos normativos a nivel europeo (DBV, RILEM, CNR-DT 204 y EHE) y se han contrastado los resultados de una campaña experimental con los resultados numéricos que con sendas ecuaciones constitutivas se obtienen. // The appearance of specific recommendations and guidelines for the employment of the Fibre Reinforced Concrete is, without any doubt, a key tool that provides a major margin of reliability to the designer. Nowadays there are numerous directives and normative recommendations that define the bases of calculation of this material, which in turn supposes a great opportunity to extend its use. In this article, a detailed analysis of the principal European normative models (DBV, RILEM, CNR-DT 204 and EHE) has been done and the results obtained by means of a numerical model (applying these codes) have been compared with the experimental data from previous tests.

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  • Durabilidad del hormigón con fibras de acero

     Blanco Álvarez, Ana
    Date of publication: 2009-05
    Book

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  • Centro lúdico y de negocios "Las Arenas"

     Pujadas Alvarez, Pablo; Blanco Álvarez, Ana
    Date of publication: 2008-06-01
    Book chapter

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  • Análisis de las causas de las diferencias de aplicación del HAC en prefabricación e in situ

     Pujadas Alvarez, Pablo; Blanco Álvarez, Ana
    Date of publication: 2008-06-01
    Book chapter

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