Correlation between bending test and Barcelona tests to determine FRC properties

Carmona, Sérgio; Molins, Climent; Aguado, Antonio

doi:10.1016/j.conbuildmat.2018.05.253

Cited by 19 publications

(12 citation statements)

References 16 publications

(12 reference statements)

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“…Similarly, it may be due to the fact that great care was taken before the test, by placing metal plates to ensure a continuous contact between the panels and the support; and during spraying, avoiding buckling on the panels. Several authors report that CV decreases with enhancing the fracture surface (Carmona et al 2018). Nonetheless, the CV increases in the mixture with higher fibre content.…”

Section: Comparison Of Coefficients Of Variationmentioning

confidence: 97%

Evaluation of Steel Fiber–Reinforced Sprayed Concrete by Energy Absorption Tests

Cáceres

Cavalaro

Figueiredo

2021

J. Mater. Civ. Eng.

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Steel fibre reinforced sprayed concrete (SFRSC) is widely used for ground support in underground works. The panel test, as in EN 14488-5, is one of the most common procedures for the quality control of the energy absorption capacity of SFRSC. The test entails the deployment of large equipment to manipulate and characterise heavy specimens that cannot be easily extracted from the structure in case a direct assessment of the material in place is needed. Alternative procedures such as the Barcelona test (BCN) have been used to assess the energy absorption of cast fibre-reinforced concrete in smaller-scale cylindrical specimens that can be extracted from the structure and are considerably less demanding in terms of equipment and payload. The objective of this study is to evaluate the use of the BCN in substitution of the traditional square panel test to assess the energy absorption of SFRSC. Both tests were conducted in parallel in combination with the quantification of the incorporated fibre content trough the inductive test. Hence, the analysis reflects the actual control conditions of the SFRSC under the influence of the spraying process. Results indicate a possible reliable correlation between the BCN and panel test if the cracked area is considered. Different sizes of cores were tested to understand the influence of this parameter in the energy absorption by the BCN test. The reduction of specimen size demands an increase in the number of determinations per batch to ensure representative results. The study suggests that the BCN can be considered a viable method to evaluate the energy absorption of SFRSC in cores extracted from test panels or actual tunnel linings.

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Section: Comparison Of Coefficients Of Variationmentioning

confidence: 97%

Evaluation of Steel Fiber–Reinforced Sprayed Concrete by Energy Absorption Tests

Cáceres

Cavalaro

Figueiredo

2021

J. Mater. Civ. Eng.

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“…In this way, Galeote et al (2017) found that the best correlations relate the force measured for a certain value of crack mouths opening displacement ( ) in the 3PB test with the force and the energy for the same axial displacement measured in the BCN. On the other side Carmona et al (2018) proposed correlations based on crack opening ( ). This deformation had been also used by Conforti et al (2017) to correlate 3PB test (EN 14651) and 4PB test (ASTM C 1609).…”

Section: Equivalence Between Flexural and Double-punch Crackingmentioning

confidence: 99%

Use of BCN test for controlling tension capacity of fiber reinforced shotcrete in mining works

Carmona

Molins

2019

Construction and Building Materials

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Fiber reinforced shotcrete (FRS) is widely used for tunnel construction. However, the systematic control of FRS properties is hampered by the complexities of the experimental procedures used. The experiments are normally based on the load-deflection response obtained from flexural tests with third-point loading performed under displacement control. These types of tests are characterized by instability when the cracking load is reached and, subsequently, errors occur in the deflection measurements, increasing the dispersion of the results. An alternative test, the Barcelona test, has some experimental advantages for FRS control as the use of much smaller specimens, an easy procedure and a lower scatter.Using the mean crack opening, correlations were established between the Barcelona test and the flexure test to estimate the toughness and residual strengths at a deflection of 3.0 mm. Equivalences between the two tests were obtained based on the laboratory results

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“…Os resultados são apresentados em um gráfico de Carga versus CMOD para teor estudado, considerando as cargas com 0,5 mm, 1,5 mm, 2,5 mm e 3,5 mm de abertura de fissura como parâmetros para avaliação do CRF. TOALDO, FIGUEIREDO, 2014;SILVA et al, 2015;MONTE et al, 2016;SIMÃO et al, 2017;NOGUEIRA et al, 2017;GALEOTE et al, 2017;CARMONA, AGUADO, MOLINS, 2018  GRUPO B: outros elementos estruturais de CRF (elementos lineares, elementos de superfície e elementos de volume).…”

Section: Efeito Sobre a Consistênciaunclassified

“…A matriz de concreto, sem adição de fibras, foi igual para as duas macrofibras e, portanto, os resultados estão apresentados apenas na Tabela 3-3. importante notar que a resistência no limite de proporcionalidade (fL), considerando todos os concretos produzidos foi na média igual a 4,39 MPa. Esse valor está em acordo com o indicado na Prática recomendada IBRACON/ABECE (2017b), 21%, é compatível com a observada por outros autores(MAIDA et al, 2015;CARMONA, MOLINS, AGUADO, 2018;CONFORTI, ZERBINO, PLIZZARI, 2018). Tabela 3-6 que os valores fL não sofreram grande variação para os diferentes teores de fibra analisados.…”

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Caracterização de concretos com macrofibras de vidro para aplicações estruturais.

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AGRADECIMENTOSInicio os agradecimentos, primeiro a Deus que sempre me dá forças para seguir em frente quando tudo parece tão difícil e inalcançável. Assim, descobri que nada é impossível, tudo depende do quanto importante é. Agradeço ao Professor Antônio Figueiredo e a minha orientadora Professora Renata Monte pela paciência e dedicação na revisão dos artigos desenvolvidos ao longo do trabalho. A Renata agradeço ainda mais, pela dedicação ao longo do desenvolvimento do trabalho e dúvidas que surgiam a cada novo tema. Sempre foi incentivadora, quando parecia não encontrar mais saídas e tempo para concluir o trabalho. Agradeço aos colegas da Poli, Ligia, Carol, Renan, Luana, André, Fernanda, Ramoel, Alan, Pedro, Tiago, Roney que eu consegui lembrar e aos que eu não lembrei, por toda ajuda no laboratório, compartilhando artigos e referencias durante o desenvolvimento da dissertação e ainda me apoiaram durante a apresentação da qualificação e artigos em congressos. Agradeço também ao pessoal do laboratório, Jessica, Adilson e Genicio, que sempre estiveram disponíveis quando precisamos durante as concretagens e ensaios. Agradeço a Escola Politécnica por toda estrutura e condições para o desenvolvimento deste trabalho e dissertação. Agradeço ao Prof. Marco Carnio da PUC -Campinas que disponibilizou equipamento para realização de uma das campanhas experimentais imprescindíveis para a conclusão do trabalho. Agradeço aos líderes e colegas de trabalho da Comgás que me apoiaram quando precisei estar ausente do trabalho durante os anos de dedicação ao mestrado. E por fim, mas não menos importante, agradeço a meu esposo William, que sempre foi um incentivador dos meus estudos, discutindo teorias e me motivando nos momentos mais difíceis. Inclusive quando Matheus nos deixava pouco tempo para atividades extrafamiliares. Agradeço também a minha mãe Neide, que mesmo sem compreender a magnitude de um curso de mestrado, desde muito cedo, sempre me disse que estudar é o caminho para um futuro melhor. E que também sempre esteve a disposição para cuidar do Matheus enquanto eu precisava estudar.ABSTRACT Cementitious materials present a fragile behavior, with low deformation capacity before rupture when subjected to tensile stresses. For this reason, technological alternatives such as fibers are used to overcome for these limitations. Steel fibers are already widely used and have a Brazilian standard for their specification. Glass fibers are another material traditionally used in reinforcing cementitious matrices, such as façade panels, known as GRC or GFRC. However, there are no Brazilian standards for these fibers' characterization. The publication of the European Model Code, fib Model Code 2010, presented a significant step for FRC technology with the introduction of guidance for design structural elements with fibers. The three-point bending test (3PBT) is the reference test for parameters to the FRC design, but the use of other tests is allowed if appropriately correlated with the reference test. In this context, this work aims to ...

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Correlation between bending test and Barcelona tests to determine FRC properties

Cited by 19 publications

References 16 publications

Evaluation of Steel Fiber–Reinforced Sprayed Concrete by Energy Absorption Tests

Evaluation of Steel Fiber–Reinforced Sprayed Concrete by Energy Absorption Tests

Use of BCN test for controlling tension capacity of fiber reinforced shotcrete in mining works

Caracterização de concretos com macrofibras de vidro para aplicações estruturais.

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