An inverse analysis method based on deflection to curvature transformation to determine the tensile properties of UHPFRC

López, Juan; Ros, Pedro Serna; Navarro‐Gregori, Juan; Camacho, Esteban

doi:10.1617/s11527-014-0434-0

Cited by 51 publications

(40 citation statements)

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“…The great disadvantage of flexural tests is that an inverse analysis is required to determine the constitutive law of the material in tension. According to [53], due to UHPFRC strain-hardening response (high strain capacity before crack localization), the characterization of the material by means of the tensile stress-strain curve is more appropriate than the stress -crack opening displacement (COD) approach adopted for FRC. An inverse analysis methodology for UHPFRC, based on four-point bending tests, is proposed in [54].…”

Section: Mechanical Characterizationmentioning

confidence: 99%

“…Unnotched four-point bending tests were performed by [53] to determine UHPFRC stress-strain response by means of a loadcurvature method. In compression, a linear stress evolution is assumed.…”

Section: Mechanical Characterizationmentioning

confidence: 99%

“…The integration procedure in [53] model is simplified by assuming a linear curvature distribution, up to matrix cracking strength (approximately 70% of the peak load), and a natural logarithm curve at the post-cracking regime. During softening, an average curvature is assumed, where the cracked area often coincides with the beam depth (smeared over a crack bandwidth into a stress-strain relationship).…”

Section: Mechanical Characterizationmentioning

confidence: 99%

“…A simplified inverse analysis method is also proposed in [35], based on four-point bending tests. An important aspect brought to light by [53] is the fact that the degree of correspondence between direct tensile tests and inverse analyses are the result of several factors that are not related to the back analysis procedure, such as the specimen size, way of casting and fiber distribution.…”

Section: Mechanical Characterizationmentioning

confidence: 99%

See 3 more Smart Citations

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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Section: Mechanical Characterizationmentioning

confidence: 99%

Section: Mechanical Characterizationmentioning

confidence: 99%

Section: Mechanical Characterizationmentioning

confidence: 99%

Section: Mechanical Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

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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“…Four-point bending tests were performed on prisms of size 100 × 100 × 500 mm 3 , with the loading points at beam length thirds, and the deflection at mid-span being measured by two displacement transducers on the front and back sides. The tensile response was obtained from the load vs deflection curves while using the simplified inverse analysis method that was proposed in [21,22]. This tensile constitutive model is defined by the parameters: elastic modulus (E), cracking strength (f t ), ultimate cracking strength (f tu ), and its associated strain (ε tu ).…”

Section: Flexural-tensile Strength Of Uhfprcsmentioning

confidence: 99%

Influence of Cracking on Oxygen Transport in UHPFRC Using Stainless Steel Sensors

et al. 2019

Self Cite

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Reinforced concrete elements frequently suffer small cracks that are not relevant from the mechanical point of view, but they can be an entrance point for aggressive agents, such as oxygen, which could initiate the degradation processes. Fiber-Reinforced Concrete and especially Ultra High Performance Concrete increase the multi-cracking behavior, reducing the crack width and spacing. In this work, the oxygen availability of three types of concrete was compared at similar strain levels to evaluate the benefit of multi-cracking in the transport of oxygen. The types of concrete studied include traditional, High-Performance, and Ultra-High-Performance Fiber-Reinforced Concrete with and without nanofibers. To this purpose, reinforced concrete beams sized 150 × 100 × 750 mm 3 were prepared with embedded stainless steel sensors that were located at three heights, which have also been validated through this work. These beams were pre-cracked in bending up to fixed strain levels.The results indicate that the sensors used were able to detect oxygen availability due to the presence of cracks and the detected differences between the studied concretes. Ultra High Performance Concrete in the cracked state displayed lower oxygen availability than the uncracked High Performance Concrete, demonstrating its potential higher durability, even when working in cracked state, thanks to the increased multi-cracking response. Author Contributions: Conceptualization, P.S. and M.V.; methodology, P.S., A.M.-I.; formal analysis, A.M.-I. and M.R.-F.; investigation, A.M.-I., E.J.M.-A. and J.L.-F.; resources, P.S. and M.V.; writing-review and editing, M.R.-F. and A.M.-I.; supervision, P.S. and M.V.; project administration, M.R.-F.; funding acquisition, A.M.-I., M.V., P.S. and M.R.-F. All authors have read and agreed to the published version of the manuscript.

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Quantitative statistical analysis of the crack propagation and fracture process of self‐compacting rubber concrete based on acoustic emission

Ming

Lü

Liu

et al. 2021

Struct Control Health Monit

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In this study, acoustic emission (AE) was used to monitor the whole process of tensile and fracture of the self-compacting rubber concrete (SCRC) under fourpoint bending. The AE activities of SCRC during the stretching and fracture process were analyzed by statistical methods to correlate the process of crack propagation with changes in mechanical properties. And by comparing the tensile and fracture properties, the change patterns of crack mode, the cumulative events and energy of AE in the bending process of SCRC with different rubber particles content, the influence of the incorporated rubber particles on the propagation of microcracks, and the macroscopic fracture mechanism were analyzed. Studies showed that with the incorporation of rubber particles, the ductility of the concrete before and after cracking was improved. Due to the weak bonding surface between the rubber particles and the matrix, the microcracks began to propagate at low-stress levels and developed steadily throughout the stretching process. As the rubber content increased, more rubber components participated in the tensile and fracture process. Because of the elastic stretching of rubber particles, the tensile deformation capacity and fracture properties of the concrete have been improved. And in the whole process of tensile and fracture, the cracking of the weak cemented surface of the matrix and the pulling of the rubber particles were more likely to cause shear mode cracks. K E Y W O R D Sacoustic emission, crack classification statistics, crack development, self-compacting rubber concrete, tensile and fracture property | INTRODUCTIONEvery year, millions of tires are discarded all over the world. It's not easily biodegradable, and the resulting "black pollution" will cause great harm to human health and the environment. 1 Concrete is a quasi-brittle multiphase material, and rubber is an elastic material. Processing waste tires into crushed rubber is added to concrete to produce rubber concrete, which not only reduces the use of aggregates but also solves the problem of rubber pollution. And compared with conventional concrete, the incorporation of rubber can improve the concrete ductility, 2 frost resistance, 3,4 energy absorption capacity, 5 and seismic performance. 6 However, crushed rubber is different from traditional rigid aggregates.

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An inverse analysis method based on deflection to curvature transformation to determine the tensile properties of UHPFRC

Cited by 51 publications

References 10 publications

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

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

Influence of Cracking on Oxygen Transport in UHPFRC Using Stainless Steel Sensors

Quantitative statistical analysis of the crack propagation and fracture process of self‐compacting rubber concrete based on acoustic emission

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