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1 to 21 of 21 results
  • Desarrollo de mejores rehabilitaciones locales en infraestructuras (MERLIN)

     Pialarissi Cavalaro, Sergio Henrique; Blanco Álvarez, Ana; Aguado De Cea, Antonio
    Participation in a competitive project

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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
    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
    Presentation's date: 2013-09
    Presentation of work at congresses

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  • 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
    Presentation's date: 2013-06-12
    Presentation of work at congresses

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  • 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
    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

  • Characterization and modelling of SFRC elements  Open access

     Blanco Álvarez, Ana
    Defense's date: 2013-03-20
    Department of Construction Engineering, Universitat Politècnica de Catalunya
    Theses

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    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.

  • Desarrollo de mejores rehabilitaciones locales en infraestructuras (MERLIN)

     Pialarissi Cavalaro, Sergio Henrique; Blanco Álvarez, Ana; Aguado De Cea, Antonio
    Participation in a competitive project

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  • 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)
    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.

  • 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
    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
    Presentation's date: 2012-10-11
    Presentation of work at congresses

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  • 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
    Presentation's date: 2012-10-09
    Presentation of work at congresses

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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
    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.

    Postprint (author’s final draft)

  • 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
    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.

    Postprint (author’s final draft)

  • 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
    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.

  • 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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  • 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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  • 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
    Participation in a competitive project

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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
    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.

    Postprint (author’s final draft)

  • 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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