Experimental investigation and identification of single and multiple cracks in synthetic fiber concrete beams

Ghahremannejad, Masoud; Mahdavi, Maziar; Saleh, Arash Emami; Abhaee, Sina; Abolmaali, Ali

doi:10.1016/j.cscm.2018.e00182

Cited by 22 publications

(12 citation statements)

References 25 publications

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“…The latter generally varies between 0.6 and 1.2% for RC beam ductility reasons, while a very broad range of FRC toughness is now available in the market. However, the majority of studies present in the literature about the flexural behavior of RC beams deals with postcracking mechanical performances typical of steel fibers, 1,3,7,9 since very few studies consider other fiber types 14,18 . This underlines the need of studying FRC with different postcracking response as compared to steel fibers, in order to prove their effectiveness and evaluate code formulation accuracy.…”

Section: Introductionmentioning

confidence: 99%

Assessing the influence of fibers on the flexural behavior of reinforced concrete beams with different longitudinal reinforcement ratios

Conforti

Zerbino

Plizzari

2020

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.

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Section: Introductionmentioning

confidence: 99%

Assessing the influence of fibers on the flexural behavior of reinforced concrete beams with different longitudinal reinforcement ratios

Conforti

Zerbino

Plizzari

2020

Structural Concrete

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“…The addition of fiber to concrete changes some of its mechanical properties, such as the highest composite tensile strength, flexural strength, impact resistance and tenacity (Neves et al, 2013;Salvador & Figueiredo, 2013;Pyo et al, 2015;Yoo et al, 2015;Mostafazadeh & Abolmaali, 2016;Yaghoobi & Chorzepa, 2017;Ghahremannejad et al, 2018;Leone et al, 2018;Monteiro et al, 2018;Ehrenbring et al, 2018) and, consequently, resistance to cracking.…”

Section: Introductionmentioning

confidence: 99%

Fiber-reinforced concrete for the flat bottom of silos

Constantino

Neto

Nóbrega

et al. 2020

Rev. bras. eng. agríc. ambient.

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The use of synthetic fibers as reinforcement for concrete replacing the steel reinforcement has been diffused worldwide in several applications, gaining prominence in the application for industrial floors, tunnel linings, road pavements, etc., i.e., continuous structures in contact with soil that require performance in the elastic medium. The present study investigated the applicability of concrete reinforced with synthetic fibers in the bottom slab of silos supported directly on the ground, being composed of an experimental study and a case study. The experimental study consisted of the analysis of the mechanical behavior of this concrete by testing three concentrations of synthetic fibers (3.0, 4.5 and 6.0 kg m -3 ) in a conventional simple concrete matrix. The case study consisted of the design of this part in conventional reinforced concrete and concrete reinforced with synthetic fibers with the objective of performing an economic comparison between the two projects. The experimental results showed that the fiber concentration that contributed to a better mechanical performance of the concrete matrix was 3.0 kg m -3 . The case study showed that the most economical design was the one made with fiber-reinforced concrete.Concreto reforçado com fibras para o fundo plano de silos RESUMO: O emprego de fibras sintéticas como reforço para concretos em substituição das armaduras de aço vem sendo difundido mundialmente em diversas aplicações, ganhando destaque na aplicação para pisos industriais, revestimentos de túneis, pavimentos rodoviários, etc., isto é, estruturas contínuas em contato com o solo que requerem desempenho no meio elástico. O presente trabalho investiga a aplicabilidade do concreto reforçado com fibras sintéticas na laje de fundo de silos apoiados diretamente sobre o solo, sendo o mesmo composto por um estudo experimental e um estudo de caso. O estudo experimental resume-se na análise do comportamento mecânico desse concreto, testando-se três concentrações de fibras sintéticas (3.0, 4.5 e 6.0 kg m -3 ) numa matriz de concreto simples convencional. O estudo de caso consiste no dimensionamento dessa peça em concreto armado convencional e concreto reforçado com fibras sintéticas, com o objetivo de realizar um comparativo econômico entre os dois projetos. Os resultados experimentais mostraram que a concentração de fibras que contribuiu para melhor desempenho mecânico da matriz de concreto foi o de 3.0 kg m -3 . O estudo de caso mostrou que o projeto mais econômico foi o dimensionado com concreto reforçado com fibras. Palavras-chave: comportamento mecânico, dimensionamento, materiais alternativos

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“…At a pH below 10.8, ettringite decomposes to release aluminum hydroxide. However, studies are known in which ettringite exists and can form when the pH is below 9.0 [20].…”

Section: Introductionmentioning

confidence: 99%

Effect of ettringite morphology on the properties of expanding cement systems

Kharchenco¹,

Alekseev²

2019

E3S Web Conf.

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The effect of the pH of the reaction solution on the crystallization process and the ettringite morphology is theoretically substantiated and experimentally proved. Using physical and chemical research methods, the dependence of the morphology of crystallizing ettringite on the pH value of the reaction solution was established. It has been established that by introducing mineral micro fillers into the composition of expanding cement, it is possible to actively influence the pH value, the morphology of the resulting ettringite, the expansion kinetics, and the strength of cement stone and concrete based on it. The studies of the technical properties of concrete on the basis of expanding cements of various types have shown that with the introduction of micro fillers into the concrete composition, which intensify volume expansion during hydration of cement stone at the building site or factories for the production of ready-mixed concrete, it is possible to control the kinetics and extent of expansion, expansion pressure, deformative and strength characteristics of concrete and reinforced concrete structures.

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Experimental investigation and identification of single and multiple cracks in synthetic fiber concrete beams

Cited by 22 publications

References 25 publications

Assessing the influence of fibers on the flexural behavior of reinforced concrete beams with different longitudinal reinforcement ratios

Assessing the influence of fibers on the flexural behavior of reinforced concrete beams with different longitudinal reinforcement ratios

Fiber-reinforced concrete for the flat bottom of silos

Effect of ettringite morphology on the properties of expanding cement systems

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