Influence of the fiber content on the compressive low-cycle fatigue behavior of self-compacting SFRC

Poveda, Elisa; Ruiz, Gonzalo; Cifuentes, Héctor; Yu, Rena C.; Zhang, Xiaoxin

doi:10.1016/j.ijfatigue.2017.04.005

Cited by 72 publications

(40 citation statements)

References 23 publications

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“…A typical example of it is reported in Figure 12, where the evolution of the crack opening at the peak of each cycle (i.e., at maximum load Lmax) is reported for the specimen CEM_SI_4. This three-stage behaviour is typically observed in plain or fibre-reinforced concrete under compressive, tensile and flexural fatigue loading [36,[49][50][51][52][53][54].…”

Section: Cyclic Reloadingmentioning

confidence: 99%

“…It is worth noting that, in literature, tests conducted over pre-cracked fibre reinforced concrete under flexure lacked this stage, because the initial loading already caused the opening of the crack [55]. So, the experimental evidence of Stage (I) in cementitious mortar This three-stage behaviour is typically observed in plain or fibre-reinforced concrete under compressive, tensile and flexural fatigue loading [36,[49][50][51][52][53][54].…”

Section: Cyclic Reloadingmentioning

confidence: 99%

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Behaviour of Pre-Cracked Self-Healing Cementitious Materials under Static and Cyclic Loading

2020

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Capsule-based self-healing is increasingly being targeted as an effective way to improve the durability and sustainability of concrete infrastructures through the extension of their service life. Assessing the mechanical and durability behaviour of self-healing materials after damage and subsequent autonomous repair is essential to validate their possible use in real structures. In this study, self-healing mortars containing cementitious tubular capsules with a polyurethanic repairing agent were experimentally investigated. Their mechanical behaviour under both static and cyclic loading was analysed as a function of some factors related to the capsules themselves (production method, waterproof coating configuration, volume of repairing agent stored) or to the specimens (number, size and distribution of the capsules in the specimen). Their mechanical performances were quantified in terms of recovery of load-bearing capacity under static conditions and number of cycles to failure as a function of the peak force under cyclic conditions. Positive results were achieved, with a maximum load recovery index up to more than 40% and number of cycles to failure exceeding 10,000 in most cases, with peak force applied during cyclic loading at least corresponding to 70% of the estimated load-bearing capacity of the healed samples.

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Section: Cyclic Reloadingmentioning

confidence: 99%

Section: Cyclic Reloadingmentioning

confidence: 99%

Behaviour of Pre-Cracked Self-Healing Cementitious Materials under Static and Cyclic Loading

2020

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“…From the results of the unconfined compressive strength test presented in Table 4, it can be noted that the unconfined compressive modulus of the cement-treated aggregate base material varied significantly with both curing times and loading rates. The patterns of variation might be similar to that of strength, so the average value of the modulus test results with different curing times and loading rates were fitted by Equations (5) and (6), as shown in Figure 7, where R 2 is the correlation coefficient.…”

Section: Patterns Of Variation Of Compressive Modulus At Different Cumentioning

confidence: 99%

“…When the cement reacts with the water, the hydration products combine the aggregate particles, thereby enhancing the strength and stiffness and improving the durability and impermeability. However, the performance of cement stabilized materials is also affected by many factors, such as aggregate type [3], cement content [4], moisture content [5], fiber content [6], curing time [7], curing condition [8], stress states [9], compaction degree and so on. Therefore many tests on the performance of cement-treated aggregate base materials have been conducted.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Equation of Cement-Treated Aggregate Base Materials under a True Stress Ratio

Liu

Lan

et al. 2018

Applied Sciences

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The objective of this article is to establish a fatigue equation based on the true stress ratio for cement-treated aggregate base materials. The true stress ratio herein means the ratio of the stress and the true strength of the cement-treated aggregate base materials related to loading rates and curing times. The unconfined compressive strength tests and compressive resilience modulus tests were carried out under various loading rates and curing times of 3, 7, 14, 28, 60, 90 days, respectively. According to the test results, the relationship between the unconfined compressive strength (a mix design parameter in China) and the compressive resilience modulus (a structural design parameter and the construction quality control parameter in China) of the cement-treated aggregate base material with different curing times was established. However, it was found that the strengths varied with the loading rates, which is not reflected in the existing fatigue equations. Therefore, it is questionable to obtain the stress ratio of fatigue tests with a fixed strength value obtained from the standard strength test where the loading rate is fixed (in China, the fixed loading rate is 1 mm/min for cement-treated aggregate base materials). Thus, in this paper, the four-point bending strength (i.e., flexural strength) test was carried out at different loading rates to resolve such deficiencies. Based on the strength test results at different loading rates, the true stress ratio of the fatigue test corresponding to the fatigue loading rate can be calculated. Then the four-point bending fatigue test was conducted to establish an improved fatigue equation characterized by the true stress ratio. The results show that the patterns of variation for unconfined compressive strength increasing with the curing time were similar to that of the compressive resilience modulus. The fatigue equation curve based on the true stress ratio can be extended to the strength failure point of (1, 1), where both the true stress ratio and the fatigue life value are one. The internal relationship between the strength failure and the fatigue failure was unified. This article provides a theoretical method and basis for unifying the mix design parameters and the construction quality control parameters.

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“…La literatura científica dice que la adición de fibra al HAC no supone incrementos significativos de f cu [22] para cuantías de fibra inferiores al 2%, pudiéndose utilizar ese dato de entrada tanto para diseñar un HAC como para un HACRFA. El valor f cu va a establecer un intervalo admisible de  HACbase que cumple con las condiciones impuestas en el modelo y es solución de la Ec.…”

Section: 1-metodología De Diseño De Hacrfa Basada En Modelos Microunclassified

Dosificación de hormigón autocompactante reforzado con fibras de acero basado en el estudio de la reología de la pasta

Velasco

Poveda

Bulté

et al. 2018

Libro De Comunicaciones / Livro Das Comunicações

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RESUMENEste trabajo presenta un método de diseño de hormigón autocompactante reforzado con fibras de acero (HACRFA) que se basa en un modelo de reología de pasta de cemento, a partir del cual se determina la viscosidad plástica de la misma mediante la relación aguamateriales cementíceos, y en un modelo micromecánico que permite estimar la viscosidad plástica efectiva del HACRFA. Son datos necesarios los valores deseados de resistencia a compresión y de viscosidad efectiva del HACRFA, así como la fracción en volumen de fibra de acero a emplear y su esbeltez. Por medio de unos sencillos gráficos de diseño, particulares para cada resistencia a compresión, se calculan las cantidades de los distintos componentes del HACRFA.PALABRAS CLAVE: HACRFA, método de diseño, reología, viscosidad plástica, resistencia a compresión 1.-INTRODUCCIÓNDurante los últimos años se han desarrollado numerosos métodos de diseño de HAC fundamentados en diferentes propiedades [1], entre los que destacan los métodos basados en modelos de reología de pasta. El comportamiento en estado fresco del HAC está muy influenciado por su composición y las características de los materiales que lo componen, siendo imprescindible entender correctamente la reología de dicho hormigón [2, 3, 4] y convirtiéndose el diseño de la mezcla en un concepto fundamental para conseguir un HAC de alta calidad. Además, una buena metodología debe ser ampliamente aplicable, suficientemente robusta ante la variabilidad de materiales y condiciones, además de cumplir con los requisitos técnicos establecidos y basarse en criterios de sostenibilidad y coste [1].La introducción de fibras en el HAC une a los efectos de su buen comportamiento en estado fresco la mejora de las propiedades mecánicas en estado endurecido que proporcionan las fibras, dando lugar al hormigón autocompactante reforzado con fibras (HACRF) [5]. El 33

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Influence of the fiber content on the compressive low-cycle fatigue behavior of self-compacting SFRC

Cited by 72 publications

References 23 publications

Behaviour of Pre-Cracked Self-Healing Cementitious Materials under Static and Cyclic Loading

Behaviour of Pre-Cracked Self-Healing Cementitious Materials under Static and Cyclic Loading

Fatigue Equation of Cement-Treated Aggregate Base Materials under a True Stress Ratio

Dosificación de hormigón autocompactante reforzado con fibras de acero basado en el estudio de la reología de la pasta

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