Permeability of ultra high performance fiber reinforced concretes (UHPFRC) under high stresses

Charron, Jean‐Philippe; Denarié, Emmanuel; Brühwiler, Eugen

doi:10.1617/s11527-006-9105-0

Cited by 104 publications

(51 citation statements)

References 5 publications

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“…[36,37,38]. The results presented in this paper indicate that fibre reinforcement can also be beneficial in concrete elements with bending cracks, where multiple cracking is not visible at the surface but where branching occurs inside the concrete.…”

Section: Total Crack Width Vs Effective Crack Widthmentioning

confidence: 81%

Characterisation of bending cracks in R/FRC using image analysis

Berrocal

Löfgren

Görander

et al. 2016

Cement and Concrete Research

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In this study, experiments were conducted to induce bending cracks of specific surface crack width to reinforced concrete beams made of plain concrete (RC) and reinforced concrete beams made of fibre reinforced concrete (R/FRC). After injecting and impregnating the cracks with dyed epoxy resin, image processing and analysis were employed to investigate the internal crack morphology. Several crack features including crack width (accumulated, effective and maximum), branching and tortuosity were defined and quantified. The results showed that in addition to arrested crack development, the presence of fibres yielded a distinctive change in the internal crack pattern, including increased branching and tortuosity, both of which have positive implications regarding concrete permeation. Likewise, specimens with fibres exhibited reduced maximum individual crack widths near the rebar, potentially increasing the ability of autogenous crack healing and reducing the risk of corrosion initiation.

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Section: Total Crack Width Vs Effective Crack Widthmentioning

confidence: 81%

Characterisation of bending cracks in R/FRC using image analysis

Berrocal

Löfgren

Görander

et al. 2016

Cement and Concrete Research

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“…It is worth mentioning that tests results from [4] demonstrated that the limit states imposed in design codes to conventional concrete should be reviewed for the case of UHPFRC. One of the greatest challenges facing fiber reinforced cementitious composites, according to [3], is how to correct link the standard tests results to the behavior of a real structural element.…”

Section: T E T Buttignol | J L a O Sousa | T N Bittencourtmentioning

confidence: 99%

“…The very low permeability of UHPFRC serves as a protection against aggressive agents, such as chloride ions that cause corrosion of steel bars and sulfate attack, which could lead to concrete expansion, crack propagation and loss of bond between the cement paste and the aggregates [14,15,16]. It is worth noting that in UHPFRC, due to the hardening behavior, small microcracks are developed before crack localization, keeping the material permeability very low even at the post-cracking phase [4]. Experimental tests carried out by [4] demonstrated that the permeability degree of uncracked and cracked UHPFRC with a strain level up to 0.15% was practically the same.…”

Section: Permeabilitymentioning

confidence: 99%

Ultra High-Performance Fiber-Reinforced Concrete (UHPFRC): a review of material properties and design procedures

Buttignol

Sousa

Bittencourt

2017

Rev. IBRACON Estrut. Mater.

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ResumoThis paper does a review of the recent achievements on the knowledge of UHPFRC properties and in the development of design procedures. UHPFRC is defined as a new material, with unique properties (high ductility, low permeability, very high strength capacity in compression, higher toughness) in comparison to conventional concrete. It is important to know both material and mechanical properties to fully take advantage of its outstanding properties for structural applications. However, since this is a new material, the current design codes are not well suited and should be reviewed before being applied to UHPFRC. In the first part, the following material properties are addressed: hydration process; permeability; fibers role; mix design; fiber-matrix bond properties workability; mixing procedure; and curing. In the second part, the mechanical properties of the material are discussed, together with some design recommendations. The aspects herein examined are: size effect; compressive and flexural strength; tensile stress-strain relation; shear and punching shear capacity; creep and shrinkage; fracture energy; steel bars anchorage and adherence. Besides, the tensile mechanical characterization is described using inverse analysis based on bending tests data. In the last part, material behavior at high temperature is discussed, including physical-chemical transformations of the concrete, spalling effect, and transient creep. In the latter case, a new Load Induced Thermal Strain (LITS) semi-empirical model is described and compared with UHPC experimental results.Keywords: Ultra-High Performance Fiber Reinforced Concrete (UHPFRC), material properties, design procedures, mechanical behavior, high temperature.Este artigo faz uma análise dos recentes avanços nas pesquisas das propriedades do CUADRF e dos seus procedimentos normativos. O CUA-DRF pode ser definido como um novo material, com propriedades muito superiores (grande ductilidade, baixíssima permeabilidade, altíssima capacidade resistente à compressão e elevada tenacidade) às do concreto convencional. O conhecimento das propriedades mecânicas e do material do CUADRF é importante para que todo o seu potencial seja plenamente utilizado. Entretanto, como este é um novo material, as recomendações normativas atuais não são plenamente válidas. Na primeira parte, as seguintes propriedades do material são descritas: processo de hidratação; permeabilidade; efeito dos diferentes tipos de fibras; definição do traço; aderência entre as fibras e o concreto; trabalhabilidade; procedimentos de mistura; e cura. Na segunda parte, as propriedades mecânicas e algumas recomendações normativas são discutidas. Neste caso são examinados o efeito escala, a resistência à compressão e à flexão, a relação tensão-deformação à tração, a força de cisalhamento e de punção, a fluência e a retração, a energia de fratura, a ancoragem e aderência das barras de aço. Além disso, são descritos alguns métodos de análise inversa para a caracterização do material à tração por meio de ensaios ...

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“…Da bei der Erhärtung das Anmachwasser beinahe vollständig verbraucht wird und sich im dichten Gefüge der Matrix kaum noch Kapillarporen bilden, weist der Baustoff eine sehr geringe Permeabilität gegenüber Wasserund Chlorideintrag auf [7]. Das im einachsigen Zugversuch beobachtete Zugverhalten (Bild 2) zeigt nach Erreichen der sogenannten elastischen Zugfestigkeit f Ute , bei der die Matrix seine Zugfestigkeit erreicht, eine deutliche Verfestigung (strain hardening) des Werkstoffs von ε U = 1 bis 3 % Dehnung bei Erreichen der UHFB-Zugfestigkeit von f Ut = 9 bis …”

Section: Eigenschaften Von Uhfb Und Stahl-uhfbunclassified

“…Dabei sind Eigenspannungen im Verbundquerschnitt infolge der Verformungsbehinderung des UHFB bei der Herstellung zu berücksichtigen. Mit diesem Modell wird beispielsweise nachgewiesen, dass eine Schicht aus UHFB flüssig-keitsdicht ist, falls im Grenzzustand der Gebrauchstauglichkeit sich der UHFB im verfestigenden Bereich befindet und die Zugdehnung das folgende Kriterium erfüllt [7]:…”

Section: Nachweis Der Gebrauchstauglichkeitunclassified

Stahl‐UHFB – Stahlbeton Verbundbauweise zur Verstärkung von bestehenden Stahlbetonbauteilen mit Ultra‐Hochleistungs‐Faserbeton (UHFB)

Brühwiler

Denarié

2013

Beton und Stahlbetonbau

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EinleitungStrengthening of existing reinforced concrete elements using Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) An original concept is presented for the strengthening of concrete structures. The main idea is to use Ultra-High Performance Fibre Reinforced Concrete (UHPFRC) complemented with steel reinforcing bars to strengthen those zones of the structure that are exposed to severe environmental influences and high mechanical loading. This concept combines efficiently protection and resistance properties of UHPFRC and significantly improves the structural performance of the rehabilitated concrete structure in terms of durability. Properties of UHPFRC are outlined and the essential theoretical background of structural behavior of R-UHPFRC -RC composite elements is given. This novel technology has been validated by means of field applications.Bild 1 Grundkonfiguration für die Verstärkung von Stahlbeton mit UHFB Basic configuration for the strengthening of reinforced concrete using UHPFRC

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Permeability of ultra high performance fiber reinforced concretes (UHPFRC) under high stresses

Cited by 104 publications

References 5 publications

Characterisation of bending cracks in R/FRC using image analysis

Characterisation of bending cracks in R/FRC using image analysis

Ultra High-Performance Fiber-Reinforced Concrete (UHPFRC): a review of material properties and design procedures

Stahl‐UHFB – Stahlbeton Verbundbauweise zur Verstärkung von bestehenden Stahlbetonbauteilen mit Ultra‐Hochleistungs‐Faserbeton (UHFB)

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