Rheology of low carbon fibre content reinforced cement mortar

Banfill, Phillip Frank Gower; Starrs, G.; Derruau, G.; McCarter, William John; Chrisp, T. M.

doi:10.1016/j.cemconcomp.2006.06.004

Cited by 81 publications

(31 citation statements)

References 22 publications

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“…Swamy and Mangat [23] observed that there was a critical volume content of fibers above which the concrete was not able to flow, even for initially very flowable cementitious matrices. The critical fiber volume content tends to decrease when the fiber aspect ratio increases [24,25]. Bui et al…”

Section: Introductionmentioning

confidence: 99%

Rheology, fiber dispersion, and robust properties of Engineered Cementitious Composites

2012

Mater Struct

254

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The capability of processing robust Engineered Cementitious Composites (ECC) materials with consistent mechanical properties is crucial for gaining acceptance of this new construction material in various structural applications. ECC's tensile strainhardening behavior and magnitude of tensile strain capacity are closely associated with fiber dispersion uniformity, which determines the fiber bridging strength, complementary energy, critical flaw size and degree of multiple-crack saturation. This study investigates the correlation between the rheological parameters of ECC mortar before adding PVA fibers, dispersion of PVA fibers, and ECC composite tensile properties. The correlation between Marsh cone flow rate and plastic viscosity was established for ECC mortar, justifying the use of the Marsh cone as a simple rheology measurement and control method before fibers are added. An optimal range of Marsh cone flow rate was found that led to improved fiber dispersion uniformity and more consistent tensile strain capacity in the composite. When coupled with the micromechanics based ingredient-tailoring methodology, this rheological control approach serves as an effective ECC fresh property design guide for achieving robust ECC composite hardening properties.

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Section: Introductionmentioning

confidence: 99%

Rheology, fiber dispersion, and robust properties of Engineered Cementitious Composites

2012

Mater Struct

254

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“…But the decrease in the workability of fresh concrete is often the disadvantage of fibers addition [7][8][9][10][11][12][13]. The reduction in the workability of concrete depends on many parameters such as maximum aggregate size, fiber volume, fiber type, fiber geometry, fiber inclusion to concrete [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…There are numerous studies on the influence of the steel fibers [11,20,24,32] or carbon fibers [10] on the rheology of fresh cementitious materials. Polymer fibers are very commonly used and their influence on the performance parameters of hardened cementitious composites is well described [16,[33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Influence of polymer fibers on rheological properties of cement mortars

Małaszkiewicz

2017

Open Engineering

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Abstract:The reinforcing effect of fibers in cement composites often results in the improvement of the brittle nature of cementitious materials. But the decrease in the workability of fresh concrete is often the disadvantage of fibers addition. Conventional single-point workability tests cannot characterize workability of concrete in terms of fundamental rheological parameters. To this end, this paper describes an investigation of the influence of synthetic fiber additions (fiber length in the range 12-50 mm and volume fraction in the range 0-4%) on the rheological properties of fiber reinforced fresh mortar (FRFM) and development of these properties over time. The rheometer Viskomat XL was used in this study. Within the limitations of the instrument and testing procedure it is shown that FRFMs conform to the Bingham model. Natural postglacial sand 0/4 mm was used as a fine aggregate and cement CEM I 42.5 R was used as a binder. Three commercial synthetic fibers were selected for these examinations. Rheological properties were expressed in terms of Bingham model parameters g (yield value ) and h (plastic viscosity). Based on the test results it was found out that the fiber type and volume fraction affected both the yield stress and plastic viscosity.

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“…The rheological behavior of low carbon fiber content reinforced cement mortar conforms to the Bingham model, i.e. by increasing fiber volume and fiber length both yield stress and plastic viscosity increases (BANFILL et al, 2006). In addition, fiber volume should be optimized to achieve optimal rheological properties while maintaining high ductility (CHOI et al, 2015).…”

Section: Fiber Content and Aspect Ratiomentioning

confidence: 82%

“…In the study of carbon fiber reinforced mortar, the authors (BANFILL et al, 2006) used the Viskomat NT to investigate the effect of mixture composition, admixtures and fine particles on the mortar rheology. The results show that by increasing the fiber volume concentration as well as the fiber length, both yield stress and plastic viscosity increase (BANFILL et al, 2006).…”

Section: Rheological Behaviormentioning

confidence: 99%

Rheological behavior of engineered cementitions composites reinforced with PVA fibers.

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direcionamento do plano de pesquisa e por todo auxílio na análise dos resultados. Merci! Quero agradecer especialmente ao meu orientador Prof. Holmer Savastano Jr. Muito obrigada por ter me aceitado como sua aluna do Doutorado em um período crítico de tantas mudanças em minha vida. Obrigada por sua disponibilidade em me orientar à distância. Por nossas reuniões pelo skype sábado, domingo de muito cedo ou muito tarde pra superar a time zone. Por ter me feito visualizar o foco do trabalho e me fazer acreditar que eu poderia conseguir meus objetivos muito mais que eu esperava. Sou eternamente grata. Agradeço ao Prof. Dr.-Ing. Dirk Lowke e Prof. Dr.-Ing Christoph Gehlen que aceitaram que eu continuasse meu trabalho de Doutorado na Technical University of Munich (TUM). Por terem me recebido maravilhosamente bem no laboratório mesmo sem nunca terem me visto antes. Obrigada porque me senti muito acolhida e querida desde que cheguei ao Centre for Building Materials (CBM). Em especial agradeço ao Dr.-Ing. Thomas Kränkel que supervisionou meu trabalho e me acompanhou durante todo o período que estive no CBM. E a todos os colegas do laboratório do AG2: Annette, Charlotte, Jussara, Niko, Carina e Daniel. Muito obrigada! Agradeço em especial ao Grisha Barabunov, que leva consigo um pedacinho do Brasil. Muito obrigada por todas as nossas conversas, por todos os cafés e por ter sido sempre tão incrível. Vielen Danke! Aos técnicos do laboratório (CBM) que foram de fundamental importância no desenvolvimento do trabalho particularmente do Capítulo 5 da Tese. Muito obrigada Barnabas Omozokpia, Klaus Linz, Thomas Höhn, Nabintou e Mike. Vielen Danke! Agradeço ao Prof. Mechtcherine da TU Dresden pela oportunidade de poder discutir meus resultados mecânicos. Vielen Danke! E agradeço também a empresa Kuraray Co. Ltda., Japan Kuralon pelo fornecimento das fibras de PVA usadas nesse trabalho. (Thank you very much Kuraray Co. Ltda., Japan Kuralon company for supplying the PVA fibers used in this study).

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Rheology of low carbon fibre content reinforced cement mortar

Cited by 81 publications

References 22 publications

Rheology, fiber dispersion, and robust properties of Engineered Cementitious Composites

Rheology, fiber dispersion, and robust properties of Engineered Cementitious Composites

Influence of polymer fibers on rheological properties of cement mortars

Rheological behavior of engineered cementitions composites reinforced with PVA fibers.

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