Exploració per autor "Domingues de Figueiredo, Antonio"
Ara es mostren els items 1-20 de 21
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Assessment of fibre content and orientation in SFRC with the inductive method. Part 1: theoretical basis of the method and study of the influence of the type of coil and temperature on its accuracy
(2015)
Text en actes de congrés
Accés obertThe inductive method is a non-destructive test which is capable to estimate both the fibre orientation and the fibre content in steel fibre reinforced concrete (SFRC) samples by the means of a coil and an impedance analyser. ... -
Assessment of fibre content and orientation in SFRC with the inductive method. Part 2: Application for the quality control of sprayed concrete
(2015)
Text en actes de congrés
Accés obertConcrete is the most used construction material in the world despite its fragility and low capacity to bear tensile stresses. Steel fibres may be added to increase the ductility of the material leading to fibre reinforced ... -
Assessment of the bearing capacity reduction of FRC elements subjected to fire
(International Federation for Structural Concrete (fib), 2019)
Text en actes de congrés
Accés restringit per política de l'editorialThe use of Fibre Reinforced Concrete (FRC) in structural applications with higher responsibility (e.g., TBM-bored tunnels; bridges; offices and residential structural elements) is increasing. In this regard, the residual ... -
Assessment of the post-fire residual bearing capacity of FRC and hybrid RC-FRC tunnel sections considering thermal spalling
(2021-12-01)
Article
Accés obertA design-oriented numerical model for the analysis of RC, FRC, and RC-FRC tunnel sections exposed to fire with different spalling parameters is presented. The numerical model is conceived in two steps: the first is the ... -
Avaliação de ensaio multidirecional com duplo entalhe para concretos reforçados com fibras
(2019)
Text en actes de congrés
Accés restringit per política de l'editorialO uso de fibras em concretos tem ganho um maior espaço no meio da construção civil e a publicação do fib Model Code 2010 pode ser considerada um grande avanço nesse sentido. Indicando a possibilidade de uso estrutural do ... -
Bond-slip response of steel fibers after exposure to elevated temperatures: experimental program and design-oriented constitutive equation
(2021-01)
Article
Accés obertThis study aimed to evaluate the effect of elevated temperatures on the bond-slip behavior of hooked-end steel fibers. A total of 180 pullout specimens were tested in post-cooling conditions using a double-sided pullout ... -
Caracterização de segmentos de túneis fabricados com concreto reforçado com fibras
(2015)
Text en actes de congrés
Accés restringit per política de l'editorialA construção de túneis tem grande importância em cidades superpopulosas como é o caso de São Paulo, devido às suas grandes demandas de infraestrutura. Neste sentido, o sistema de escavação mecanizada (TBM) é uma alternativa ... -
Compressive strength estimation of sprayed concrete at early ages
(2013)
Text en actes de congrés
Accés restringit per política de l'editorialThe sprayed concrete complies a construction technique that combines the placement and the compacting of concrete in only one process. This sort of concrete, which is widely used in underground constructions, requires a ... -
Design of macro-synthetic fibre reinforced concrete pipes
(2013-06-03)
Article
Accés restringit per política de l'editorialThis paper presents an experimental campaign in which concrete pipes were manufactured using plastic fibres as the sole reinforcement material. In this regard, it has been demonstrated that the use of plastic fibres is ... -
Design-oriented assessment of the residual post-fire bearing capacity of precast fiber reinforced concrete tunnel linings
(2022-01)
Article
Accés obertThis study presents a meso-scale experimental program and employs a numerical approach to determine the bearing capacity of steel fiber reinforced concretes (SFRC) tunnel linings after fire exposure. First, the effect of ... -
Early age hydration of cement pastes with alkaline and alkali-free accelerators for sprayed concrete
(2016-05)
Article
Accés obertThe objective of this study is to evaluate the early age hydration mechanisms of accelerated CEM I pastes. Liquid phase analysis, conductimetry, isothermal calorimetry, in situ XRD and SEM were performed on cement pastes ... -
Effect of cement composition on the reactivity of alkali-free accelerating admixtures for shotcrete
(2014)
Text en actes de congrés
Accés restringit per política de l'editorialThe evolution of mechanical strength in cement matrices is strongly dependent on cement properties and on the admixtures used. Limestone additions and accelerators, used in shotcrete, alter the hydration mechanisms of the ... -
Evaluation of concrete-steel bond strength in wet mix sprayed concrete
(2014)
Text en actes de congrés
Accés obertThe high performance obtained in wet mix sprayed concrete has extended the field of applications of this technique. In some of these applications, such as in diaphragm walls or bridge rehabilitation, the structure may be ... -
Influence of spraying on the early hydration of accelerated cement pastes
(2016-10)
Article
Accés obertIn practice, most of the studies about the interaction between cement and accelerators is performed with hand-mixed pastes. However, in many applications mixing occurs through spraying, which may affect accelerators ... -
Numerical simulation of steel fibre reinforced concrete pipes using constitutive equations based on the Barcelona test
(American Concrete Institute (ACI), 2014)
Text en actes de congrés
Accés restringit per política de l'editorialThe use of fibres as main reinforcement for concrete pipes is recognized as an attractive alternative to the steel bars especially for smaller diameters. Nevertheless, the use of fibre reinforcement has not been consolidated ... -
Overview of progress in European medium sized tokamaks towards an integrated plasma-edge/wall solution a
(2017-10-01)
Article
Accés obertIntegrating the plasma core performance with an edge and scrape-off layer (SOL) that leads to tolerable heat and particle loads on the wall is a major challenge. The new European medium size tokamak task force (EU-MST) ... -
Parameters controlling early age hydration of cement pastes containing accelerators for sprayed concrete
(2016-11)
Article
Accés obertThe objective of this work is to parametrize the early age hydration behavior of accelerated cement pastes based on the chemical properties of cement and accelerators. Eight cements, three alkali-free and one alkaline ... -
Propuesta de método de optimización de refuerzo de segmentos de túneles fabricados con hormigón reforzado con fibras
(2015)
Text en actes de congrés
Accés restringit per política de l'editorialThe construction of underground lines has a big importance in overpopulated cities such as São Paulo. In that sense, the tunnel boring machine (TBM) method for tunnel construction is a method that allows a high speed of ... -
Steel fiber reinforced concrete pipes. Part 1: technological analysis of the mechanical behavior
(2012-01)
Article
Accés obertThis paper is the first part of an extensive work focusing the technological development of steel fiber reinforced concrete pipes (FRCP). Here is presented and discussed the experimental campaign focusing the test procedure ... -
Steel fiber reinforced concrete pipes. Part 2: Numerical model to simulate the crushing test
(2012-01)
Article
Accés obertThis paper is part of an extensive work about the technological development, experimental analysis and numerical modeling of steel fibre reinforced concrete pipes. The first part (“Steel fibre reinforced concrete pipes. ...
