Influence of fibre orientation on the tensile behaviour of ultra-high performance fibre reinforced cementitious composites

Abrishambaf, Amin; Pimentel, Mário

doi:10.1016/j.cemconres.2017.03.007

Cited by 176 publications

(71 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Laranjeira et al [7] concluíram que os primeiro e segundo momentos de θ estão correlacionados e ambos podem ser expressos como função do número de orientação, η θ,i . Os resultados da análise de imagem apresentados em [4,5] confirmam esta proposta e mostram que, de facto, é possível obter boas estimativas de α 1,i , em função de η θ,i (ou α 0,i ).…”

Section: 2-previsão Do Fator De Eficiência Das Fibrasunclassified

“…Para cenários de orientação menos favoráveis, os resultados da análise de imagem apresentados em [4,5] evidenciam uma relação linear entre α 1 e η θ,i (ver Figura 5). A linha sólida, a cinza, corresponde aos valores (60°) que são obtidos assumindo uma distribuição gaussiana para θ, com desvio padrão e média determinados a partir de η θ,i , de acordo com Laranjeira et al [7].…”

Section: 2-previsão Do Fator De Eficiência Das Fibrasunclassified

See 1 more Smart Citation

Determinação da resistência à tração de camadas de UHPFRC com base em ensaio não-destrutivo

Nunes

Pimentel

Abrishambaf

2018

Libro De Comunicaciones / Livro Das Comunicações

Self Cite

View full text Add to dashboard Cite

RESUMONo presente artigo apresenta-se um procedimento para estimar a resistência à tração de camadas de materiais cimentícios de ultra-elevado desempenho reforçados com fibras de aço (Ultra-High Performance Fibre-Reinforced cement Composites -UHPFRC na sigla em Inglês), recorrendo a um modelo mecânico simples proposto inicialmente por Naaman [1]. Este procedimento baseia-se na aplicação de um método de ensaio não-destrutivo (NDT), desenvolvido na FEUP, que permite avaliar a dosagem e um coeficiente de orientação das fibras; e em ensaios laboratoriais de tração para estimar a tensão de aderência fibra-matriz equivalente, assumindo um comportamento rigido-plástico. Foi desenvolvido um programa experimental que permitiu estabelecer a relação entre o coeficiente de orientação determinado pelo método NDT e os parâmetros de orientação determinados a partir de análise de imagem. Finalmente, seguindo o procedimento proposto, foi estimada a resistência à tração de diversos provetes, com uma gama variada de dosagens e orientação das fibras, e comparada com os resultados experimentais. A boa correlação encontrada demonstra o potencial do método NDT proposto para a implementação de procedimentos de controle de qualidade em aplicações com UHPFRC. PALAVRAS-CHAVE: materiais cimentícios de ultra-elevado desempenho reforçados com fibras de aço (UHPFRC); resistência à tração, ensaio não-destrutivo.

show abstract

Section: 2-previsão Do Fator De Eficiência Das Fibrasunclassified

Determinação da resistência à tração de camadas de UHPFRC com base em ensaio não-destrutivo

Nunes

Pimentel

Abrishambaf

2018

Libro De Comunicaciones / Livro Das Comunicações

Self Cite

View full text Add to dashboard Cite

show abstract

“…Cement-based materials possess some shortcomings, such as low tensile strength, poor toughness, and difficult control of crack width after cracking. To overcome these disadvantages, it is advisable to use a kind of composite material, a fiber-reinforced cement-based composite (also called fiber-reinforced cement-based composite), composed of discontinuous short fibers or continuous long fibers mixed with cement-based materials as reinforcing materials [1][2][3]. At present, the main reinforcements in fiber-reinforced cement-based composites are steel fibers, synthetic polymer fibers, carbon fibers, glass fibers, and asbestos fibers [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Straw Fiber Modification Methods on Compatibility between Straw Fibers and Cement‐Based Materials

Jiang

Cui

et al. 2020

Advances in Civil Engineering

View full text Add to dashboard Cite

To improve the utilization of crop straws as a resource and the compatibility between straw fibers and cement-based materials, the hydration of modified straw fiber cement-based composite (SFCC) was studied. e structural characteristic of SFCC was investigated by FTIR, SEM, and XRD. e results show that the setting time of several modified straw fiber SFCC pastes was shorter than that of the unmodified straw fiber SFCC paste, and the best method of fiber modification to improve the setting time of the SFCC paste is Na 2 O·nSiO 2 treatment. e recommended fiber modification method for improving the compatibility between straw fibers and cement-based materials is alkali modification, followed by pure acrylic emulsion modification and Na 2 O·nSiO 2 modification. To improve the strength of SFCC, the straw fiber should be modified by alkali, followed by pure acrylic emulsion and Na 2 O·nSiO 2 modification and the method of water modification is also recommended. e phase types and relative contents of crystalline hydration products mixed with the modified straw fiber SFCC are significantly higher than those of the unmodified fiber SFCC. e fiber treatment method that was most helpful to increase the structural density of hydrates of SFCC was alkali treatment and pure acrylic emulsion treatment, followed by Na 2 O·nSiO 2 treatment.

show abstract

“…An effective method is the use for the materials of protective structures a fiber reinforced concrete, which potentially has a high impact resistance (Klyuev et al 2018;Lesovik et al 2018;Urkhanova et al 2018;Fediuk et al 2017Fediuk et al , 2018aFediuk et al , 2018bFediuk et al , 2019Abrishambaf 2017;Yoo 2016).The distribution of stresses in the concrete matrix, provided by the dispersion reinforcement leads, to a certain extent, to the growth of the whole complex of physical and mechanical properties and performance characteristics of the composite: both compressive and tensile strengths, crack resistance, impact endurance (Lesovik et al 2019;Ganesh et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Link of Self-Compacting Fiber Concrete Behaviors to Composite Binders and Superplasticizer

Федюк

Mosaberpanah

Lesovik

et al. 2020

ACT

View full text Add to dashboard Cite

Composite binders were prepared as novel compositions, on the basis of which fiber reinforced self-compacting concretes (FRSCC) with high rheological, mechanical, dynamical, and impermeability behaviors are created. Rice husk ash, quartz sand, and limestone crushing waste within CEM I and different ratio of superplasticizer were investigated as components of composite binders. Central Composite Face Centered method was used to design the number of experiments and randomizations and then screened by Response Surface Methodology. The validity of models was projected by ANOVA. Replacement of cement by waste composite binders as a supplementary cementitious material has a positive effect on mechanical properties of FRSCC from 30% to around 35% of cement replacement. Adding the superplasticizer improved the performance of FRSCC in all aspects in the given range. Increasing the waste composite binders decreased the vapor permeability and effective diffusion coefficient of FRSCC by improving the hydration rate and decreasing the pores of the concrete matrix. Designed FRSCC has the potential to be used as a material for protective structures, because it is able to provide comprehensive protection against the dynamic effects and penetration of gases.

show abstract

Influence of fibre orientation on the tensile behaviour of ultra-high performance fibre reinforced cementitious composites

Cited by 176 publications

References 26 publications

Determinação da resistência à tração de camadas de UHPFRC com base em ensaio não-destrutivo

Determinação da resistência à tração de camadas de UHPFRC com base em ensaio não-destrutivo

Effect of Straw Fiber Modification Methods on Compatibility between Straw Fibers and Cement‐Based Materials

Link of Self-Compacting Fiber Concrete Behaviors to Composite Binders and Superplasticizer

Contact Info

Product

Resources

About