A new strength model for the high-performance fiber reinforced concrete

Ramadoss, P.; Nagamani, K.

doi:10.12989/cac.2008.5.1.021

Cited by 20 publications

(15 citation statements)

References 7 publications

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“…Les fibres n'interviennent qu'après la rupture du béton, elles transfèrent les contraintes à travers la fissure, en offrant ainsi au matériau une certaine rigidité et un contrôle parfait de l'ouverture des fissures. La majorité des recherches faites sur les matériaux cimentaires renforcés de fibres [14][15][16][17] confirment l'efficacité des fibres sur le comportement en flexion des matériaux. Nous avons constaté que l'effet des fibres sur le comportement en flexion est conditionné par leur distribution efficace dans le béton.…”

Section: Comportement à La Flexionunclassified

Study of the reinforcement of structure members by polypropylene fibres waste

Bendjillali

Chemrouk

2018

MATEC Web Conf.

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The valorisation of industrial waste in the field of construction became a very interesting axis of research from scientific, economic and environmental point of view. We have conducted this work to study the effect of the addition of polypropylene fibres waste on the mechanical behaviour of reinforced concrete beams subjected to a simple flexural loading, with and without transversal reinforcement. The used fibres are coming from the waste of the fabrication of domestic brushes and sweeps; they have an average diameter of 0.47 mm and a length between 40 and 60 mm. Two weight dosages of fibres are used, 0.25 and 0.5 %. The experimental results showed that the incorporation of polypropylene fibres waste into the concrete affects negatively its workability, but its flexural and compressive strength are improved. The fibers have presented a significant contribution on the shear behavior and the cracking of beams, particularly in absence of transversal bars. The waste used in this work as fibrous reinforcement has not only increased the ductility of reinforced concrete beams, but it have also provided a perfect cracking distribution on the concrete surface and it has participated in a considerable way in the reduction of cracks number and dimensions, which allows to ensure the material durability and then the structure longevity. The reinforcement of concrete beams with 0.5 % of polypropylene fibers waste with a minimal steel bars can ensure an excellent mechanical behavior in shear, as in flexion.Résumé. La valorisation des déchets industriels dans le domaine de la construction est devenue actuellement un axe de recherche très intéressant, non seulement du point de vue scientifique, mais encore du point de vue économique et environnemental. C'est alors dans cette optique que nous avons mené ce travail qui consiste à étudier l'effet de l'addition d'un déchet en fibres de polypropylène sur le comportement mécanique des poutres en béton armé soumises à la flexion simple en présence ou non du ferraillage transversal. Le renforcement employé est un déchet fibreux provenant de la fabrication des balais et des brosses domestiques, de diamètre moyen de l'ordre de 0.47 mm et de longueur variant entre 40 et 60 mm. Deux dosages massiques de fibres sont employés 0.25 et 0.5 %. Les résultats expérimentaux ont montré que bien que l'incorporation du déchet en fibres de polypropylène dans le béton a affecté négativement l'ouvrabilité du matériau, mais leur effet sur sa résistance à la flexion et à la compression est très considérable. Les fibres employées ont présenté également un apport très significatif sur le comportement au cisaillement des éléments poutres, particulièrement en absence d'armatures transversales et aussi sur leur état de fissuration. Le déchet utilisé comme renforcement fibreux non seulement a augmenté la ductilité des poutres en béton armé, mais il a aussi offert une parfaite distribution des fissures sur la surface du béton et il a participé d'une façon très appréciable à la réduction du nombre de fissures et ...

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Section: Comportement à La Flexionunclassified

Study of the reinforcement of structure members by polypropylene fibres waste

Bendjillali

Chemrouk

2018

MATEC Web Conf.

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“…Many studies and FEM analyses of the bending moment of the double-layered RC beam are also interested [16]. Based on the studies of Iskhakov et al, material modeling of SFs' reinforced concrete [17][18][19], and in which [20] the input parameters in the design of RC beams affecting the work of SFs' reinforced concrete beams were investigated. Te authors of this research [21] conducted experiments on beams made of two layers of SFs' concrete.…”

Section: Introductionmentioning

confidence: 99%

The Behavior of RC Beams Strengthened with Steel Fiber Concrete Layer by ANSYS Simulation

Lam¹,

Dung²

2023

Advances in Civil Engineering

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In this study, a double-layer reinforced concrete beam structure was created for the purpose of repairing reinforced concrete beams by pouring a layer of concrete on top of the reinforced concrete beam and then adding fibers to the concrete. Take into consideration the bearing capacity of these double-layer concrete beams as well as the effects that the input parameters have on the stress strain, the propagation of cracks in reinforced concrete beams. The study looks at double-layered reinforced concrete beams, with the steel fiber concrete placed on top of the one containing the normal concrete. This investigation led to the following relationships: load-compressive stress, tensile stress, and vertical displacement at the midpoint of the beam span, as well as a diagram showing how cracks spread in the beams. After getting the experimental results and comparing them with an ANSYS simulation, the diagram was used to figure out the loads at which the beams start to look cracked and the loads at which the beams are damaged. This study investigated the following six cases: how the addition of SFs affects the properties of concrete, the spacing of the stirrups at the ends of the beam should be looked into to see what effects it might have, how the number of tensile steel bars in the beam affects its properties, how the diameter of tensile steel bars affects their properties, how the diameter of compressed steel bars affects the results, and how the thickness of the SFC layer affects the properties of the material. Also, the things that were mentioned would have a big effect on how these double-layer beams in the design work.

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“…Invention, artistic and mechanical competence have been some of the terms which have placed UHPC structures in the lead. UHPC extraordinary characteristics have made it widespread and commonly used in structural applications [1][2][3]. High strength materials influence on column carrying capacity has been investigated and showed that materials strength and confinement have significant impact on load carrying capacity for various geometry setups [4].…”

Section: Introductionmentioning

confidence: 99%

Determination of Axial Capacity for Enhanced Normal and Ultra - High Performance Concrete Columns

Shafeeq

Ahmed

2021

Civil and Environmental Engineering

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Concrete Technology has been developing for more than a century. One of the most exceptional achievements in concrete technology is the evolving of Ultra-High Performance Concrete (UHPC) which has been a research focus in a wide applications diversity. In this paper, an experimental work has been carried out for investigating the transverse and longitudinal reinforcements’ variation influence on the axial capacity of UHPC columns. Eight columns (five UHPC columns and three Normal Strength Concrete (NSC) columns) have been poured and tested under a concentric axial compression load till a failure is reached. Then, the results are reported herein. The experimental results show that UHPC columns failed in a controlled manner and no concrete chips or a concrete cover spalling are observed. Also, the longitudinal reinforcements have not buckled away beyond the peak load because of the presence of the reinforcing steel fibers in UHPC. Correspondingly, the steel ties spacing proportionally affects the load carrying capacity of columns as presented hereinafter.

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A new strength model for the high-performance fiber reinforced concrete

Cited by 20 publications

References 7 publications

Study of the reinforcement of structure members by polypropylene fibres waste

Study of the reinforcement of structure members by polypropylene fibres waste

The Behavior of RC Beams Strengthened with Steel Fiber Concrete Layer by ANSYS Simulation

Determination of Axial Capacity for Enhanced Normal and Ultra - High Performance Concrete Columns

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