Analysis of the tensile fracture properties of ultra-high-strength fiber-reinforced concrete with different types of steel fibers by X-ray tomography

Ríos, José D.; Leiva, Carlos; Ariza, Manuel R. Gómez; Seitl, Stanislav; Cifuentes, Héctor

doi:10.1016/j.matdes.2019.107582

Cited by 50 publications

(20 citation statements)

References 66 publications

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“…In this work, it has used an inverse analysis method that is based on the non-linear hinge model described in [14,45,46] to determine the parameters that defines the bilinear tension softening diagram (see Figure 5). It is worth noting that a qualitative analysis of the influence of the microstructure in the fracture behaviour of concrete can be completed from their corresponding bilinear softening diagrams, as was carried out in other authors [14,15,47,48]. The first steep linear branch of the softening diagrams is mainly a consequence of the microcracking process and the second linear branch is due to the frictional dissipation processes (e.g., aggregate interlock).…”

Section: Bilinear Tension Softening Diagrammentioning

confidence: 97%

Analysis of the Utilization of Air-Cooled Blast Furnace Slag as Industrial Waste Aggregates in Self-Compacting Concrete

et al. 2019

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In this work, the effects of replacing the aggregates of self-compacting concrete by air-cooled blast furnace slag have been analysed. Different mixes have been manufactured by substituting the fine and coarse natural aggregates by air-cooled blast furnace slag. The fracture energy and the tensile and compressive strength have been determined for each mix. The self-compacting properties of the mixes, or the absence of them, have been observed. The main goals of this research are the decrease of the price of aggregates, reduction of the industrial waste, and attenuation the rate of consumption of natural resources. The results show that the self-compactability of the concrete is gradually lost as the slag content is increased, thus, when the ratio of replacement is low, the concrete keeps the self-compacting properties. Nevertheless, the loss of self-compaction affects the mechanical properties by increasing its strength. An air-cooled blast furnace slag did not present problems of heavy metals leaching.

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Section: Bilinear Tension Softening Diagrammentioning

confidence: 97%

Analysis of the Utilization of Air-Cooled Blast Furnace Slag as Industrial Waste Aggregates in Self-Compacting Concrete

et al. 2019

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“…En Ríos et al [4] se conoce que un incremento de la temperatura provoca un aumento de la porosidad en hormigones de ultra-alta resistencia, especialmente de los microporos, de una manera mucho más drástica que como ocurría en el hormigón sin fibra D0. Aunque a temperatura ambiente la porosimetría de un hormigón con fibras resulta mucho más homogénea que en un hormigón sin fibras, el efecto que la temperatura tiene a parte de aumentar la porosidad, es provocar una deshomogenización de la distribución de poros incrementando de manera notable la cantidad de microporos [3].…”

Section: Resistencia a Compresiónunclassified

“…En trabajos previos, entre los que cabe destacar los realizados por algunos de los autores [3], [4], se ha puesto de manifiesto la efectividad de la adición de fibras de polipropileno para reducir el daño térmico que se genera. Sin embargo, son pocos los estudios que se pueden encontrar sobre el comportamiento de los hormigones de muy alta resistencia sometidos a temperatura elevada y aun más escasos cuando están sometidos a cargas de choque térmico.…”

Section: Introductionunclassified

Estudio del comportamiento de hormigones de muy alta resistencia sometidos a cargas de choque térmico

Bulté¹,

Jiménez²,

Concha³

2022

hya

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En este trabajo se realiza un análisis experimental del comportamiento de hormigones de muy altas prestaciones reforzados con fibras sometidos a cargas de choque térmico. Este tipo de materiales puede emplearse en estructuras de responsabilidad y que estén sometidas a cargas de choque térmico durante su vida útil, como en el caso de depósitos de almacenamiento de vapor o cimentaciones de tanques de sales, entre otros. En estos casos, es necesario conocer el comportamiento de estos materiales ante las modificaciones microestructurales que las cargas de origen térmico y el gradiente de aplicación de las mismas pueda producir. Para ello, se han fabricado distintas probetas (cúbicas, cilíndricas y prismáticas) de hormigones de muy alta resistencia (con y sin refuerzo de fibras de acero como material de control) y se han sometido a un calentamiento progresivo en horno de hasta 300ºC y posterior enfriamiento rápido mediante aire o agua. A continuación, se han realizado ensayos de compresión simple, módulo de Young y energía de fractura (ensayos a flexión en tres puntos) para la determinación de sus propiedades mecánicas y en fractura residuales. Estos ensayos se han complementado con análisis mediante tomografía computerizada para relacionar los cambios microestructurales observados con la alteración de las propiedades mecánicas.

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“…José D. Ríos explained this investigation and is worried about the examination of the tractable properties of an ultrahigh‐quality fiber‐strengthened cement made with short and long steel strands. The investigation includes utilizing various systems—from mechanical tests to X‐beam processed tomography—to relate the watched variety of the mechanical properties of the blends with their porosity.…”

Section: Literature Reviewmentioning

confidence: 99%

Tomography of reinforced concrete

Chandrasekaran

2019

Mat Design & Process Comms

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Tomography imaging an object is by taking measurements from slice of xy‐planes or cross sections. Nondestructive mapping of the internal structures of a concrete member is a solid body, including intrinsic complexity and anisotropy of the section phase, imperfection, crack, inhomogeneities, and anisotropy. Computed tomography with X‐ray and gamma rays, and electrical impedance tomography, back scattering microwave imaging. X‐rays computed tomography shows promise in high resolution (5 μm) detection cracks and positions of rebar in concrete structure. EIT has the potential for locating rebars water filled fracture, and similar zones of high conductivity of Concrete with the possible of gaining information about corrosion around the reinforcement bars. Back scattering microwave imaging can be used to inspect flat surfaces and to locate rebars within 6 to 7 cm depth from the concrete surfaces. The electrical tomography is a technique in expensive and availability and works fast and easy. X‐ray computed tomography needs a more elaborate and expensive measurements and operations.

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Analysis of the tensile fracture properties of ultra-high-strength fiber-reinforced concrete with different types of steel fibers by X-ray tomography

Cited by 50 publications

References 66 publications

Analysis of the Utilization of Air-Cooled Blast Furnace Slag as Industrial Waste Aggregates in Self-Compacting Concrete

Analysis of the Utilization of Air-Cooled Blast Furnace Slag as Industrial Waste Aggregates in Self-Compacting Concrete

Estudio del comportamiento de hormigones de muy alta resistencia sometidos a cargas de choque térmico

Tomography of reinforced concrete

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