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Dr. Antonio Conforti
Department of Civil, Environmental, Architectural Engineering and Mathematics - DICATAM, University of Brescia, Via Branze, 43-25123 Brescia, Italy

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0 Corrosion
0 Fiber Reinforced Concrete
0 Durability
0 Sustainable structures and materials
0 Iron and steel slags in concrete

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Fiber Reinforced Concrete
Durability
Corrosion
Iron and steel slags in concrete

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Technical paper
Published: 10 April 2021 in Structural Concrete
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The use of bundled bars in highly loaded concrete members instead of individual bars can reduce or even avoid reinforcement congestion, allowing easier placing and compaction of concrete, since bundles (with two or more side‐by‐side bars) are less obstructive to fresh‐concrete flow. However, there is still a lack in knowledge of the fundamental phenomena related to the bond behavior of bars in bundles. Therefore, design code rules for anchorages and splices differ significantly among International Standards (Eurocode 2, fib Model Code 2010, and ACI 318–19). The present paper reports the results of more than 100 pullout tests with short embedded length with the aim of comparing the local bond behavior of bundles with that of corresponding notional individual bars. Among the three criteria usually introduced to compare bundled and individual bars, based on the concepts of “equivalent sectional area,” and “minimum or maximum sectional perimeter,” the first and the second are introduced in this paper. Experimental results show that both criteria are suitable methods for evaluating the bearing capacity of bundled bar anchorages, even if equivalent area criterion seems to be slightly more conservative. The experimental results provide also information on the bursting forces generated by the wedge action of the ribs which clearly increases with bar diameter. Finally, experimental results are compared with design rules for anchorage strength of bundled bars as prescribed by fib‐Model Code 2010.

ACS Style

Giovanni Metelli; John Cairns; Antonio Conforti; Giovanni A. Plizzari. Local bond behavior of bundled bars: Experimental investigation. Structural Concrete 2021, 1 .

AMA Style

Giovanni Metelli, John Cairns, Antonio Conforti, Giovanni A. Plizzari. Local bond behavior of bundled bars: Experimental investigation. Structural Concrete. 2021; ():1.

Chicago/Turabian Style

Giovanni Metelli; John Cairns; Antonio Conforti; Giovanni A. Plizzari. 2021. "Local bond behavior of bundled bars: Experimental investigation." Structural Concrete , no. : 1.

Response
Published: 09 March 2021 in Structural Concrete
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ACS Style

Antonio Conforti; Raúl Zerbino; Giovanni A. Plizzari. Authors' closure on the discussion of the article: “Assessing the influence of fibers on the flexural behavior of reinforced concrete beams with different longitudinal reinforcement ratios” (discussion by Markić et al.). Structural Concrete 2021, 22, 1892 -1893.

AMA Style

Antonio Conforti, Raúl Zerbino, Giovanni A. Plizzari. Authors' closure on the discussion of the article: “Assessing the influence of fibers on the flexural behavior of reinforced concrete beams with different longitudinal reinforcement ratios” (discussion by Markić et al.). Structural Concrete. 2021; 22 (3):1892-1893.

Chicago/Turabian Style

Antonio Conforti; Raúl Zerbino; Giovanni A. Plizzari. 2021. "Authors' closure on the discussion of the article: “Assessing the influence of fibers on the flexural behavior of reinforced concrete beams with different longitudinal reinforcement ratios” (discussion by Markić et al.)." Structural Concrete 22, no. 3: 1892-1893.

Journal article
Published: 01 February 2021
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ACS Style

Bruno Leporace Guimil; Antonio Conforti; Raúl Zerbino; Giovanni Plizzari. CORROSIONE DELLE BARRE DI ARMATURA IN ELEMENTI IN CALCESTRUZZO ARMATO E CALCESTRUZZO FIBRORINFORZATO. 2021, 233, 1 -10.

AMA Style

Bruno Leporace Guimil, Antonio Conforti, Raúl Zerbino, Giovanni Plizzari. CORROSIONE DELLE BARRE DI ARMATURA IN ELEMENTI IN CALCESTRUZZO ARMATO E CALCESTRUZZO FIBRORINFORZATO. . 2021; 233 ():1-10.

Chicago/Turabian Style

Bruno Leporace Guimil; Antonio Conforti; Raúl Zerbino; Giovanni Plizzari. 2021. "CORROSIONE DELLE BARRE DI ARMATURA IN ELEMENTI IN CALCESTRUZZO ARMATO E CALCESTRUZZO FIBRORINFORZATO." 233, no. : 1-10.

Technical paper
Published: 20 January 2021 in Structural Concrete
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After several decades of research studies, design rules for fiber reinforced concrete (FRC) are now available for several structural elements. Starting from standard tests, it is possible to determine design parameters and constitutive laws to perform simplified sectional verifications and/or numerical analyses. However, one of the main issues still open is represented by the fiber orientation in the real structure that could be different from the one present in standard tests. For this reason, building codes take into account orientation factors to modify the standard material properties. The present paper aims to shed some new lights on the effects of the orientation of steel and macro‐synthetic fibers on the local variability of FRC residual strength properties in slabs made with two concretes: Vibrated (slump of 80 ± 20 mm, V‐FRC) and self‐compacting concrete (slump flow diameter of 700 ± 50 mm, SC‐FRC). In V‐FRC slabs, the orientation of polymer fibers was more influenced by pouring and compaction process compared to steel ones. In SC‐FRC slabs, the flow and wall effects resulted more significant when long steel fibers were used. The post‐cracking performances locally determined in different points of slabs were compared against the ones obtained on standard beams as well. Finally, the global response of these slabs was numerically studied by considering two different support configurations: simply‐supported slabs and slabs on grade.

ACS Style

Antonio Conforti; Estefania Cuenca; Raúl Zerbino; Giovanni A. Plizzari. Influence of fiber orientation on the behavior of fiber reinforced concrete slabs. Structural Concrete 2021, 22, 1831 -1844.

AMA Style

Antonio Conforti, Estefania Cuenca, Raúl Zerbino, Giovanni A. Plizzari. Influence of fiber orientation on the behavior of fiber reinforced concrete slabs. Structural Concrete. 2021; 22 (3):1831-1844.

Chicago/Turabian Style

Antonio Conforti; Estefania Cuenca; Raúl Zerbino; Giovanni A. Plizzari. 2021. "Influence of fiber orientation on the behavior of fiber reinforced concrete slabs." Structural Concrete 22, no. 3: 1831-1844.

Journal article
Published: 08 January 2021 in Sustainability
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In the two last decades, world production of pig iron and steel has undergone a significant increase. In 2018, 1252.87 and 1806.46 million tons of pig iron and steel, respectively, were produced as compared to the 575.78 and 809.94 million tons of 2000. Consequently, the amount of the different types of slags deriving from these production processes has also increased considerably. In relation to the principles of sustainability and circular economy, the available literature suggests several possible reuses for these slags (bituminous conglomerates, hydraulic engineering, metallurgy, fertilizers, etc.). This paper aims to provide an overview of the iron and steel slags production and their reuse in concrete (for example as replacement of cement, fine or coarse aggregates). The characteristics of slags are analyzed in terms of chemical, physical, and mechanical properties. Mechanical and durability tests (both from material and structures point of view) carried out in the different studies and research are shown as well. Particular attention was devoted to electric arc furnace slags (EAF) since they are the most produced in Italy. Based on this deep literature review, the gaps that still require further studies have been identified and discussed.

ACS Style

Alan Piemonti; Antonio Conforti; Luca Cominoli; Sabrina Sorlini; Antonella Luciano; Giovanni Plizzari. Use of Iron and Steel Slags in Concrete: State of the Art and Future Perspectives. Sustainability 2021, 13, 556 .

AMA Style

Alan Piemonti, Antonio Conforti, Luca Cominoli, Sabrina Sorlini, Antonella Luciano, Giovanni Plizzari. Use of Iron and Steel Slags in Concrete: State of the Art and Future Perspectives. Sustainability. 2021; 13 (2):556.

Chicago/Turabian Style

Alan Piemonti; Antonio Conforti; Luca Cominoli; Sabrina Sorlini; Antonella Luciano; Giovanni Plizzari. 2021. "Use of Iron and Steel Slags in Concrete: State of the Art and Future Perspectives." Sustainability 13, no. 2: 556.

Technical paper
Published: 03 June 2020 in Structural Concrete
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The use of fibers in reinforced concrete (RC) beams mainly improves both the bearing capacity and the cracking control. In this way, positive effects on the service life of RC structures can be expected. In this paper, the fiber influence on the flexural behavior of RC beams with different longitudinal reinforcement ratios (0.5% ≤ ρs ≤ 1.2%) is analyzed by testing small‐scale RC beams. Concretes incorporating 0, 25 and 50 kg/m3 of steel, 6 and 12 kg/m3 of glass macrofibers, and 5 and 10 kg/m3 of polymer macrofibers were studied. Crack and deflection control, as well as bearing capacity and crack localization were evaluated for a broad range of fiber‐reinforced concrete (FRC) toughness. It is verified that fibers, in the longitudinal reinforcement ratio considered, improve the bending behavior at serviceability limit state (SLS) and ultimate limit state (ULS) of RC beams, without limiting the structure ductility. It was also confirmed the philosophy of the fib Model Code 2010, such that FRC can be considered as a composite material where performance parameters govern its mechanical behavior. Finally, the several data available allowed to deeply analyze fib Model Code 2010 formulations (mean crack spacing and flexural bearing capacity) and to propose modifications where needed.

ACS Style

Antonio Conforti; Raúl Zerbino; Giovanni Plizzari. Assessing the influence of fibers on the flexural behavior of reinforced concrete beams with different longitudinal reinforcement ratios. Structural Concrete 2020, 22, 347 -360.

AMA Style

Antonio Conforti, Raúl Zerbino, Giovanni Plizzari. Assessing the influence of fibers on the flexural behavior of reinforced concrete beams with different longitudinal reinforcement ratios. Structural Concrete. 2020; 22 (1):347-360.

Chicago/Turabian Style

Antonio Conforti; Raúl Zerbino; Giovanni Plizzari. 2020. "Assessing the influence of fibers on the flexural behavior of reinforced concrete beams with different longitudinal reinforcement ratios." Structural Concrete 22, no. 1: 347-360.

Journal article
Published: 17 February 2020 in Materials and Structures
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Fibre reinforced concrete (FRC) increases shear capacity mainly by providing post-cracking residual strengths and by improving the aggregate interlock mechanism on the two crack faces. Hence, direct shear tests can be adopted to study the shear transfer mechanisms across a crack. Several researches studied the behaviour of steel fibre reinforced concrete by means of shear tests initially developed for plain concrete (PC). Due to an increased heterogeneity of material (caused by a random fibre distribution) and the need to carry out the test up to a higher crack width (Mode I) and slip (Mode II), tests on FRC are more difficult as compared to PC and the issue related to the rotation of the cracking plane is more likely to develop. In addition, other fibre types or materials different than ordinary concrete have not been studied in depth so far. In this context, the present study firstly evaluates the influence of rigid (steel) and non-rigid (polypropylene) fibres on the direct shear behaviour of ordinary concrete (considering a broad range of FRC toughness). To do this, the modified JSCE SF6 test was improved by avoiding friction and by providing a steel system to control rotations. Secondly, the direct shear behaviour of alkali activated concrete (AAC) reinforced by steel fibres was compared against ordinary FRC in order to underline possible differences. Experimental results showed that, under direct shear tests, the fibre influence on the shear stresses transferred across a crack is only related to FRC toughness and not to fibre type (rigid or non-rigid). AAC also showed to have a shear behaviour comparable to ordinary concrete.

ACS Style

Estefania Cuenca; Antonio Conforti; Linda Monfardini; Fausto Minelli. Shear transfer across a crack in ordinary and alkali activated concrete reinforced by different fibre types. Materials and Structures 2020, 53, 1 -15.

AMA Style

Estefania Cuenca, Antonio Conforti, Linda Monfardini, Fausto Minelli. Shear transfer across a crack in ordinary and alkali activated concrete reinforced by different fibre types. Materials and Structures. 2020; 53 (2):1-15.

Chicago/Turabian Style

Estefania Cuenca; Antonio Conforti; Linda Monfardini; Fausto Minelli. 2020. "Shear transfer across a crack in ordinary and alkali activated concrete reinforced by different fibre types." Materials and Structures 53, no. 2: 1-15.

Journal article
Published: 21 January 2020 in Engineering Structures
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Experimental and numerical research studies demonstrated that the addition of fibres in correct proportions, enhances the shear behaviour of Reinforced Concrete (RC) elements, allowing to totally or partially replace the conventional web reinforcement. However, despite of this increase of knowledge about Fibre Reinforced Concrete (FRC), there is still a gap in the applicability of fibres as a shear reinforcement in certain prestressed structural elements where the use of conventional transverse reinforcement is difficult due to their manufacturing process, e.g. extruded elements in dry concrete. In this context, the present paper evaluates the possibility of enhancing the shear strength of Hollow-Core Slabs (HCS) by using Polypropylene Fibre Reinforced Concrete (PFRC). HCS can be critical in shear at their end zones, since these zones are disturbed regions (already stressed in tension by splitting forces) in which the beneficial effects of the prestressing actions on the shear strength are not active yet. Five full-scale HCS (42 cm high, 120 cm wide and 600 cm long) were tested under shear loading (1 in RC and 4 in PFRC). Two tests were performed on each slab varying the shear-span-to-effective depth ratio (a/d = 2.8 according to EN1168 and a/d = 3.5). Results show that macro-synthetic fibres are able to improve the shear strength of hollow-core slabs of about 25%; furthermore tests according to EN1168 are more affected by arch actions as compared to a/d = 3.5. Finally, the comparison between experimental results and predictions of four international codes (Eurocode 2, ACI 318-14, Model Code 2010 and EN1168), highlighted the need of improving the actual shear formulations.

ACS Style

Antonio Conforti; Francisco Ortiz-Navas; Alan Piemonti; Giovanni A. Plizzari. Enhancing the shear strength of hollow-core slabs by using polypropylene fibres. Engineering Structures 2020, 207, 110172 .

AMA Style

Antonio Conforti, Francisco Ortiz-Navas, Alan Piemonti, Giovanni A. Plizzari. Enhancing the shear strength of hollow-core slabs by using polypropylene fibres. Engineering Structures. 2020; 207 ():110172.

Chicago/Turabian Style

Antonio Conforti; Francisco Ortiz-Navas; Alan Piemonti; Giovanni A. Plizzari. 2020. "Enhancing the shear strength of hollow-core slabs by using polypropylene fibres." Engineering Structures 207, no. : 110172.

Journal article
Published: 18 September 2019 in Engineering Structures
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The addition of fibers has been proven successful to simplify reinforcement in precast tunnel segments, allowing as a function of both segment typology and fiber reinforced concrete (FRC) toughness a total or partial replacement of the conventional reinforcement. Results from an experimental research aimed at comparing the structural behavior of segments made with conventional (only rebars, RC) or hybrid (rebars + fibers) reinforcement are presented. The experimental program consisted of flexural and point load tests (which reproduces the jack actions during TBM operations) carried out on four large-scale precast tunnel segments representative of a metro tunnel lining characterized by an internal diameter of 5.80 m and a thickness of 0.30 m. The main goal of the experimental program was to evaluate the possibility of using macro-synthetic polypropylene fibers (Polypropylene Fiber Reinforced Concrete, PFRC) in combination with a lower amount of conventional rebars (optimized reinforcement, RCO) for guaranteeing the required segment performance. Experimental results indicate that macro-synthetic fibers may be very effective in combination with conventional rebars to withstand the main stresses that arise in a segment both at initial and final phases, proving that the adoption of hybrid reinforcement solution using macro-synthetic fiber is possible for metro tunnel lining.

ACS Style

Antonio Conforti; Ivan Trabucchi; Giuseppe Tiberti; Giovanni A. Plizzari; Angelo Caratelli; Alberto Meda. Precast tunnel segments for metro tunnel lining: A hybrid reinforcement solution using macro-synthetic fibers. Engineering Structures 2019, 199, 109628 .

AMA Style

Antonio Conforti, Ivan Trabucchi, Giuseppe Tiberti, Giovanni A. Plizzari, Angelo Caratelli, Alberto Meda. Precast tunnel segments for metro tunnel lining: A hybrid reinforcement solution using macro-synthetic fibers. Engineering Structures. 2019; 199 ():109628.

Chicago/Turabian Style

Antonio Conforti; Ivan Trabucchi; Giuseppe Tiberti; Giovanni A. Plizzari; Angelo Caratelli; Alberto Meda. 2019. "Precast tunnel segments for metro tunnel lining: A hybrid reinforcement solution using macro-synthetic fibers." Engineering Structures 199, no. : 109628.

Conference paper
Published: 05 September 2019 in Proceedings of EECE 2020
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Elevated concrete slabs are typically used as columns/piles supported floors in multi-story buildings or industrial facilities. The need to reduce construction time and costs has favoured the use of ever more advanced materials, like Steel Fiber Reinforced Concrete, as an alternative to conventional reinforced concrete. Many research studies and on-site applications have proven that steel fibers can be successfully used to totally substitute the main flexural reinforcement generally placed in conventional reinforced concrete slabs. However, in order to ensure the required minimum structural performance both at ultimate and serviceability loading conditions, the total removal of rebars requires the use of very high steel fiber contents (>70 kg/m3). However, the use of a proper combination of fibers and conventional rebars, generally known as Hybrid Reinforced Concrete (HRC), may represent a feasible solution to get the required structural performance by minimizing, at the same time, the total amount of reinforcement (fibers+rebars). This paper focuses on the design of HRC elevated slabs according to the design provisions for FRC structures reported by the fib Model Code 2010 and recently introduced also by the Italian structural design code (NTC 2018). A simplified design procedure based on a consolidated design practice is proposed. Emphasis is given to the use of HRC for optimizing the slab reinforcement. A case study of an elevated slab made with synthetic Fiber Reinforced Concrete is used to show the effectiveness of the design procedure.

ACS Style

L. Facconi; A. Conforti; Fausto Minelli; G. Plizzari. Flexural Design of Elevated Slabs Made of FRC According to fib Model Code 2010: A Case Study. Proceedings of EECE 2020 2019, 570 -584.

AMA Style

L. Facconi, A. Conforti, Fausto Minelli, G. Plizzari. Flexural Design of Elevated Slabs Made of FRC According to fib Model Code 2010: A Case Study. Proceedings of EECE 2020. 2019; ():570-584.

Chicago/Turabian Style

L. Facconi; A. Conforti; Fausto Minelli; G. Plizzari. 2019. "Flexural Design of Elevated Slabs Made of FRC According to fib Model Code 2010: A Case Study." Proceedings of EECE 2020 , no. : 570-584.

Technical paper
Published: 12 July 2018 in Structural Concrete
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The use of fibers can improve the behavior at serviceability limit states (crack and deflection control) and ultimate limit states (bearing capacity) of reinforced concrete (RC) elements under flexure. Fibers reinforcement provides a postcracking resistance, leading RC element to have a more diffused crack patterns characterized by narrower and more closely spaced cracks. Some doubts are instead related to RC element ductility, which can be affected by crack localization after rebar yielding. However, most of experiments present in literature relate only to elements in steel fiber reinforced concrete with significant residual strengths (fR,1 and fR,3 greater than 3.5–4.0 MPa). This paper aims to evaluate the influence of different fiber type (steel, glass, or polymer macrofibers) on the cracking and strength capacity of RC beams under flexure by using a broad range of Fiber Reinforced Concrete (FRC) toughness (1.6 ≤ fR,1 ≤ 5.1 MPa and 0.8 ≤ fR,3 ≤ 4.5 MPa). Twenty‐one small scale RC beams with a typical value of longitudinal reinforcement ratio (0.87%) were tested under flexure. Crack and deflection control, as well as bearing capacity and crack localization were evaluated as a function of FRC toughness. Finally, results were compared against mean crack spacing and strength capacity predictions of fib Model Code 2010.

ACS Style

Antonio Conforti; Raúl Zerbino; Giovanni A. Plizzari. Influence of steel, glass and polymer fibers on the cracking behavior of reinforced concrete beams under flexure. Structural Concrete 2018, 20, 133 -143.

AMA Style

Antonio Conforti, Raúl Zerbino, Giovanni A. Plizzari. Influence of steel, glass and polymer fibers on the cracking behavior of reinforced concrete beams under flexure. Structural Concrete. 2018; 20 (1):133-143.

Chicago/Turabian Style

Antonio Conforti; Raúl Zerbino; Giovanni A. Plizzari. 2018. "Influence of steel, glass and polymer fibers on the cracking behavior of reinforced concrete beams under flexure." Structural Concrete 20, no. 1: 133-143.

Journal article
Published: 11 July 2018 in Fibers
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Fiber addition has become one of the most prevalent methods for enhancing the tensile behavior of concrete. Fibers reduce cracking phenomena and improve the energy absorption capacity of the structure. On the other hand, the introduction of fibers can introduce a negative impact on concrete workability, whose loss is influenced by different parameters (among which are fiber content and fiber type). In this context, an exploratory study on the influence of steel (high stiffness) and macro-synthetic (low stiffness) fibers on the fresh properties of concrete was carried out, considering workability and air content, as well as resultant mechanical performance. Four fiber types at two volume fractions (0.5% and 1.0%) were studied in two base concretes with different water-to-cement ratios (0.45 and 0.50) by using the slump test, DIN flow table test and air content meter. An additional parameter for the DIN flow table test is proposed herein to quantify the potential preferential flow direction caused by fiber orientation and entanglement. Air meter results showed that the fibers caused only a slight increase in concrete air content; this agreed well with the results of mechanical testing, which showed no apparent effect on measured compressive strength. In addition, it was captured that, for a given fiber volume fraction, steel fibers more adversely affected Fiber Reinforced Concrete (FRC) workability as compared to polypropylene ones, while the opposite result was obtained considering FRC toughness.

ACS Style

Veronica Guerini; Antonio Conforti; Giovanni Plizzari; Shiho Kawashima. Influence of Steel and Macro-Synthetic Fibers on Concrete Properties. Fibers 2018, 6, 47 .

AMA Style

Veronica Guerini, Antonio Conforti, Giovanni Plizzari, Shiho Kawashima. Influence of Steel and Macro-Synthetic Fibers on Concrete Properties. Fibers. 2018; 6 (3):47.

Chicago/Turabian Style

Veronica Guerini; Antonio Conforti; Giovanni Plizzari; Shiho Kawashima. 2018. "Influence of Steel and Macro-Synthetic Fibers on Concrete Properties." Fibers 6, no. 3: 47.

Conference paper
Published: 05 March 2018 in Libro de Comunicaciones / Livro das Comunicações
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La incorporación de fibras al hormigón controla la propagación de fisuras dando lugar a incrementos en la resistencia residual y tenacidad del material. Cuando se incorporan en elementos estructurales de hormigón armado las fibras contribuyen a la resistencia al corte y favorecen el control en el ancho de fisuras con sus consecuentes ventajas en lo concerniente a la vida en servicio y la durabilidad del material. Este trabajo presenta los resultados de un estudio de la influencia del tipo y contenido de fibra sobre el control de fisuración en flexión en vigas de hormigón armado. Se estudió la distribución y propagación de fisuras en ensayos de flexión con cargas en cuatro puntos realizados sobre vigas de hormigón armado con una sección rectangular con 150 mm de arista y una luz entre apoyos de 840 mm. Se compara la respuesta de hormigones que incorporan diferentes contenidos de fibras de acero, macrofibras poliméricas y macrofibras de vidrio. Como referencia se realizaron ensayos de flexión en tres puntos sobre prismas entallados de 150 x 150 x 600 mm según norma EN14651 para la caracterización del hormigón con fibras y ensayos de compresión sobre cilindros. Los resultados obtenidos ponen en evidencia la contribución del tipo y contenido de fibras sobre el control de fisuras en flexión.DOI: http://dx.doi.org/10.4995/HAC2018.2018.5502

ACS Style

Giovanni Plizzari; Michele Fasciolo; Antonio Conforti; Raul Luis Zerbino. Control de fisuración en vigas de hormigón armado reforzado con diferentes fibras. Libro de Comunicaciones / Livro das Comunicações 2018, 1 .

AMA Style

Giovanni Plizzari, Michele Fasciolo, Antonio Conforti, Raul Luis Zerbino. Control de fisuración en vigas de hormigón armado reforzado con diferentes fibras. Libro de Comunicaciones / Livro das Comunicações. 2018; ():1.

Chicago/Turabian Style

Giovanni Plizzari; Michele Fasciolo; Antonio Conforti; Raul Luis Zerbino. 2018. "Control de fisuración en vigas de hormigón armado reforzado con diferentes fibras." Libro de Comunicaciones / Livro das Comunicações , no. : 1.

Conference paper
Published: 05 March 2018 in Libro de Comunicaciones / Livro das Comunicações
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Diversos trabajos han analizado los factores que modifican la orientación de las fibras cuando se incorporan al hormigón autocompactante, entre los que se destacan el efecto pared y la velocidad de flujo. Como consecuencia se puede producir una respuesta anisotrópica en los elementos estructurales que depende de la forma de vertido y de la geometría de los mismos. Este trabajo analiza la orientación de las fibras y sus efectos sobre las propiedades mecánicas en losas rectangulares de 1800 mm de largo, 925 mm de ancho y 100 mm de altura que fueron moldeadas con 4 hormigones autocompactantes que incorporan diferentes tipos de fibras de acero y macrofibras poliméricas, todos elaborados a partir de un mismo hormigón de base. De cada losa se aserraron 18 prismas de 550 mm de largo en direcciones normal y perpendicular a la dirección que luego se ensayaron de acuerdo a lo establecido en la norma EN 14651. Finalizados los mismos se realizó un conteo de la densidad de fibras en las superficies de fractura. Como referencia también se realizaron ensayos similares sobre prismas de 150 x 100 x 600 mm y ensayos de compresión sobre cubos. Los resultados obtenidos ponen en evidencia el efecto del tipo de fibra y el grado de variabilidad que puede ocurrir en este tipo de elementos estructurales.DOI:http://dx.doi.org/10.4995/HAC2018.2018.5496

ACS Style

Raul Luis Zerbino; Antonio Conforti; Giovanni Plizzari. Estudio comparativo de la orientación del refuerzo en losas de hormigón autocompactante reforzado con fibras poliméricas y de acero. Libro de Comunicaciones / Livro das Comunicações 2018, 1 .

AMA Style

Raul Luis Zerbino, Antonio Conforti, Giovanni Plizzari. Estudio comparativo de la orientación del refuerzo en losas de hormigón autocompactante reforzado con fibras poliméricas y de acero. Libro de Comunicaciones / Livro das Comunicações. 2018; ():1.

Chicago/Turabian Style

Raul Luis Zerbino; Antonio Conforti; Giovanni Plizzari. 2018. "Estudio comparativo de la orientación del refuerzo en losas de hormigón autocompactante reforzado con fibras poliméricas y de acero." Libro de Comunicaciones / Livro das Comunicações , no. : 1.

Journal article
Published: 12 January 2018 in Materials and Structures
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The shear strength of elements reinforced by fibres is predicted by Codes using formulations generally developed from a limited set of test results. In fact, only few of available test results are combined with a material mechanical characterization, allowing to evaluate and compare the different performances of Fibre Reinforced Concretes (FRC). To address this problem, a material-performance-based shear database for FRC elements and their related reference samples in Reinforced Concrete (RC, with and without web reinforcement) is presented herein, merging the experiences carried out in the last decade at the University of Brescia and at the Universitat Politècnica de València. The database is composed by 171 specimens: 93 in FRC and 78 in RC with or without web reinforcement. For FRC elements, the post-cracking resistance (fR,1 and fR,3) is also given according to EN 14651 standard. The evaluation of the shear database was also carried out, discussing the influence of the different factors affecting the shear strength both in FRC and RC samples. Finally, the two formulations suggested by Model Code 2010 for FRC elements are compared against the database results in order to shed new light on code requirements.

ACS Style

Estefanía Cuenca; Antonio Conforti; Fausto Minelli; Giovanni A. Plizzari; Juan Navarro Gregori; Pedro Serna. A material-performance-based database for FRC and RC elements under shear loading. Materials and Structures 2018, 51, 11 .

AMA Style

Estefanía Cuenca, Antonio Conforti, Fausto Minelli, Giovanni A. Plizzari, Juan Navarro Gregori, Pedro Serna. A material-performance-based database for FRC and RC elements under shear loading. Materials and Structures. 2018; 51 (1):11.

Chicago/Turabian Style

Estefanía Cuenca; Antonio Conforti; Fausto Minelli; Giovanni A. Plizzari; Juan Navarro Gregori; Pedro Serna. 2018. "A material-performance-based database for FRC and RC elements under shear loading." Materials and Structures 51, no. 1: 11.

Article
Published: 11 October 2017 in Structural Concrete
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Different tests are proposed by international standards for the evaluation of the mechanical properties of fiber reinforced concrete (FRC); among them, either beams or round determinate panels are generally used. However, different tests are accepted by design codes if reliable correlation factors between standard parameters are provided (fib Model Code 2010). Within this context, a broad experimental program on both beams and round determinate panels was carried out in order to provide a critical discussion on material characterization and to evaluate possible correlation factors. Beam tests according to European (EN 14651), American (ASTM 1609), and Japanese (JCI-SF4) standard, as well as small round panels and large round panels (according to ASTM 1550) were studied within an experimental program comprising 189 beams and 90 round panels. Unlike previous researches, mainly focused on steel fibers, two types of macro-synthetic fibers were considered. Based on these experimental results, a comparison between test methods is presented, along with correlation approaches are proposed and critically discussed.

ACS Style

Antonio Conforti; Fausto Minelli; Giovanni A. Plizzari; Giuseppe Tiberti. Comparing test methods for the mechanical characterization of fiber reinforced concrete. Structural Concrete 2017, 19, 656 -669.

AMA Style

Antonio Conforti, Fausto Minelli, Giovanni A. Plizzari, Giuseppe Tiberti. Comparing test methods for the mechanical characterization of fiber reinforced concrete. Structural Concrete. 2017; 19 (3):656-669.

Chicago/Turabian Style

Antonio Conforti; Fausto Minelli; Giovanni A. Plizzari; Giuseppe Tiberti. 2017. "Comparing test methods for the mechanical characterization of fiber reinforced concrete." Structural Concrete 19, no. 3: 656-669.

Journal article
Published: 01 September 2017 in Engineering Structures
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Antonio Conforti; Fausto Minelli; Giovanni Plizzari. Shear behaviour of prestressed double tees in self-compacting polypropylene fibre reinforced concrete. Engineering Structures 2017, 146, 93 -104.

AMA Style

Antonio Conforti, Fausto Minelli, Giovanni Plizzari. Shear behaviour of prestressed double tees in self-compacting polypropylene fibre reinforced concrete. Engineering Structures. 2017; 146 ():93-104.

Chicago/Turabian Style

Antonio Conforti; Fausto Minelli; Giovanni Plizzari. 2017. "Shear behaviour of prestressed double tees in self-compacting polypropylene fibre reinforced concrete." Engineering Structures 146, no. : 93-104.

Journal article
Published: 01 July 2017 in ACI Structural Journal
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Antonio Conforti; Fausto Minelli; Giovanni A. Plizzari. Influence of Width-to-Effective Depth Ratio on Shear Strength of Reinforced Concrete Elements without Web Reinforcement. ACI Structural Journal 2017, 114, 1 .

AMA Style

Antonio Conforti, Fausto Minelli, Giovanni A. Plizzari. Influence of Width-to-Effective Depth Ratio on Shear Strength of Reinforced Concrete Elements without Web Reinforcement. ACI Structural Journal. 2017; 114 (4):1.

Chicago/Turabian Style

Antonio Conforti; Fausto Minelli; Giovanni A. Plizzari. 2017. "Influence of Width-to-Effective Depth Ratio on Shear Strength of Reinforced Concrete Elements without Web Reinforcement." ACI Structural Journal 114, no. 4: 1.

Journal article
Published: 01 March 2017 in Tunnelling and Underground Space Technology
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Antonio Conforti; Giuseppe Tiberti; Giovanni Plizzari; Angelo Caratelli; Alberto Meda. Precast tunnel segments reinforced by macro-synthetic fibers. Tunnelling and Underground Space Technology 2017, 63, 1 -11.

AMA Style

Antonio Conforti, Giuseppe Tiberti, Giovanni Plizzari, Angelo Caratelli, Alberto Meda. Precast tunnel segments reinforced by macro-synthetic fibers. Tunnelling and Underground Space Technology. 2017; 63 ():1-11.

Chicago/Turabian Style

Antonio Conforti; Giuseppe Tiberti; Giovanni Plizzari; Angelo Caratelli; Alberto Meda. 2017. "Precast tunnel segments reinforced by macro-synthetic fibers." Tunnelling and Underground Space Technology 63, no. : 1-11.

Journal article
Published: 01 November 2016 in Magazine of Concrete Research
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Antonio Conforti; Giuseppe Tiberti; Giovanni A. Plizzari. Combined effect of high concentrated loads exerted by TBM hydraulic jacks. Magazine of Concrete Research 2016, 68, 1 -11.

AMA Style

Antonio Conforti, Giuseppe Tiberti, Giovanni A. Plizzari. Combined effect of high concentrated loads exerted by TBM hydraulic jacks. Magazine of Concrete Research. 2016; 68 (21):1-11.

Chicago/Turabian Style

Antonio Conforti; Giuseppe Tiberti; Giovanni A. Plizzari. 2016. "Combined effect of high concentrated loads exerted by TBM hydraulic jacks." Magazine of Concrete Research 68, no. 21: 1-11.