On the mechanical response of Hybrid Fiber Reinforced Concrete with Recycled and Industrial Steel Fibers

Caggiano, António; Folino, Paula; Lima, Carmine; Martinelli, Enzo; Pepe, Marco

doi:10.1016/j.conbuildmat.2017.04.160

Cited by 151 publications

(102 citation statements)

References 41 publications

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“…It's worth to highlight that samples indicated as reference samples are related to those which were not exposed to acid attack The compressive strength test showed that samples suffered the most damage by sulfuric acid, whereas the nitric acid samples with no fibers and with 100% metal fibers had increased strength values as compared with the reference mixtures. Caggiano et al (2017) [39] found out that the use of microfibers slightly influences the compressive strength of composites, opposing to the results obtained and showed at The results showed that the damage caused to conventional concrete were very similar for the three acids. Also, sulfuric acid was the acid that showed the greatest potential for concrete degradation.…”

Section: Resultsmentioning

confidence: 88%

Effects of fiber hybridization in advanced cementitious composites durability in humid and aggressive environments

et al. 2018

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Reactive powder concrete (RPC) is one type of advanced cementitious composite that has been increasingly used. Its high mechanical strength enables the application of the composite in bolder structures. Considering its recent history of use, there is a lack of knowledge about this materials durability. Therefore, this paper aimed to evaluate the behavior of hybrid fiber reinforced RPC under accelerated testing, evaluating different hybrid fiber combinations. Composites contained metallic microfibers and polypropylene fibers in the following proportions: 100/0%, 75/25%, 50/50%, and 0/0% (metallic/polypropylene). Accelerated tests were performed (salt spray, carbonation and acid immersion), as well as 3D microtomography analyses, in order to visualize the distribution of fibers throughout the matrix. Results indicated high durability under some aggressive wet environments, with no signs of carbonation, nor damage caused by salt spray, and small damage related to sulfuric acid attack. In addition, it was possible to observe in the 3D microtomography images that fibers are well distributed in the matrix volume, and that there is no transition zone in the material due to the reduced volume void.

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Section: Resultsmentioning

confidence: 88%

Effects of fiber hybridization in advanced cementitious composites durability in humid and aggressive environments

et al. 2018

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“…It can be observed from the previous experimental studies of steel and metallic fibers [7][8][9][10][11][12][13][14], natural fibers [15] and polymetric fibers [16][17][18] that the incorporation of single type of fibers in concrete does not significantly influence the various characteristics of concrete except strain and crack resistance, while the incorporation of hybrid fibers effectively increase the resistance to cracking and strain efficiency in several levels [19,20]. To improve the ductility, bridge the cracks and prevent their propagation in the concrete, the addition of fibers is an effective way [21].…”

Section: Introductionmentioning

confidence: 91%

Experimental and numerical behavior of hybrid-fiber-reinforced concrete compression members under concentric loading

Raza

Khan

2020

SN Appl. Sci.

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The modern research is aimed to enhance the tensile properties of concrete so that its performance should be made better in various reinforced concrete structures. In the current study, twenty hybrid-fiber-reinforced concrete (HFRC) columns and one plain concrete column were cast to examine the effect of hybrid fibers on the axial capacity, load-deflection response and cracking patterns of columns under axial concentric loading. All specimens were square in cross section having a side length of 150 mm and a height of 1200 mm. Two different types of fibers were used; one is steel fibers (SF) and second is polypropylene fibers (PPF). Four different volumetric ratios of SF (0.7%, 0.8%, 0.9%, 1.0%) and five different ratios of PPF (0.1%, 0.3%, 0.5%, 0.7%, 0.9%) were used in the current study. The results indicate that the combination of 0.8% SF and 0.5% PPF performed well for load-carrying capacity and a combination of 0.9% SF and 0.3% PPF presented the best performance for the ductility of HFRC columns. Moreover, a constitutive finite element model (FEM) was proposed using concrete damaged plastic (CDP) model in ABAQUS for predicting the axial behavior and crack patterns of HFRC columns under concentric loading. A close agreement was observed between the experimental measurements and FE predictions. Finally, a detailed comparison of theoretical axial capacities of HFRC columns was performed using the predictions of various codes and proposed equations.

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“…Más específicamente, se partió de una mezcla de FRC de referencia con 0,5 % en volumen de fibras de acero industriales (industrial steel fibers, ISF), es decir 40 kg/ m 3 , y se prepararon tres mezclas más reemplazando el 25 %, 50 % y 100 % de dichas fibras con una cantidad igual de fibras recicladas (recycled steel fibers, RSF). De este modo, el comportamiento mecánico del hormigón reforzado solo con ISF fue comparado con el hormigón con un híbrido de fibras de acero (industriales y recicladas) y también con el hormigón reforzado solo con RSF, con el objetivo de determinar la factibilidad de su uso como material estructural Caggiano et al, 2017;. Las fibras de acero recicladas empleadas en este estudio (figura 2a) fueron suministradas por una empresa dedicada a recolectar y reciclar neumáticos usados.…”

Section: Incorporación De Fibras De Acero Recicladas En El Hormigónunclassified

Uso de materiales reciclados en compuestos cementicios

Xargay

Ripani

Caggiano

et al. 2019

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Contexto: La producción de hormigón se caracteriza por una importante demanda de energía y materias primas, emitiendo grandes cantidades de gases de efecto invernadero (GEI). Asimismo, la construcción, mantenimiento y demolición de edificios genera enormes cantidades de residuos que requieren costosos y ambientalmente sensibles procedimientos de disposición final. Por tanto, en la actualidad se están investigando diversas soluciones para reducir el impacto ambiental de los procesos asociados al ciclo de vida del hormigón. Metodología: Se estudiaron, mediante ensayos experimentales, las propiedades físicas y mecánicas de los siguientes materiales sustentables: hormigón con agregados reciclados, hormigón con reemplazo parcial de cemento Portland por cenizas volantes y compuestos cementicios reforzados con fibras recicladas. Resultados: El uso de agregados gruesos reciclados degradó las características mecánicas del hormigón debido a su mayor porosidad y capacidad de absorción de agua. Sin embargo, su combinación con cenizas volantes mostró un efecto sinérgico, mitigando las consecuencias adversas mencionadas. La respuesta posfisuración del hormigón reforzado con fibras de acero recicladas se caracterizó por una menor tenacidad y ductilidad respecto a los compuestos con fibras industriales. Específicamente, las mezclas con fibras recicladas mostraron una etapa de ablandamiento más pronunciada. Esto reveló una eficiencia menor de las fibras recicladas con respecto a las industriales. Conclusiones: Los resultados experimentales demostraron que la incorporación de materiales reciclados condujo a un deterioro en el comportamiento físico y mecánico-resistente de los compuestos analizados. No obstante, las propiedades resultantes superaron los valores mínimos recomendados para su aplicación como materiales estructurales.

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On the mechanical response of Hybrid Fiber Reinforced Concrete with Recycled and Industrial Steel Fibers

Cited by 151 publications

References 41 publications

Effects of fiber hybridization in advanced cementitious composites durability in humid and aggressive environments

Effects of fiber hybridization in advanced cementitious composites durability in humid and aggressive environments

Experimental and numerical behavior of hybrid-fiber-reinforced concrete compression members under concentric loading

Uso de materiales reciclados en compuestos cementicios

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