[논문]Experimental Study of Steel Fiber Concrete Slabs Part I: Behavior under Uniformly Distributed Loads

Ellouze, Ali; Ouezdou, Mongi Ben; Karray, Mohammed Ali

doi:10.4334/ijcsm.2010.4.2.113

Experimental Study of Steel Fiber Concrete Slabs Part I: Behavior under Uniformly Distributed Loads 원문보기

International journal of concrete structures and materials, v.4 no.2, 2010년, pp.113 - 118

Ellouze, Ali (Civil Engineering Laboratory, National Engineering School of Tunis) , Ouezdou, Mongi Ben (Civil Engineering Laboratory, National Engineering School of Tunis) , Karray, Mohammed Ali (Civil Engineering Laboratory, National Engineering School of Tunis)

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This article aims to study the effects of adding steel fibers to concrete on the mechanical behavior of steel fiber concrete (SFC) slabs. After formulating the SFC, an experimental work was, first, conducted on $160\;{\times}\;320$ mm cylindrical specimens and $70\;{\times}\;70\;{\times}\;280$ mm prisms. Then, this study was carried out on 20 rectangular $1,100\;{\times}\;1,100\;{\times}\;60$ mm small slabs submitted to a distributed load. Two types of fibers with hooked ends were used: long fibers (LF) of a length of 50 mm and short fibers (SF) of a length of 35 mm. The studied parameters are compressive and tensile strengths and Young's modulus. Plain concrete (PC) small slabs were also prepared to be compared to the SFC specimens. The results showed that the compressive strength of SFC increased up to 25% while the splitting tests showed an improvement of the SFC reaching 45%. Tests on SFC small slabs also showed that a smaller deflection is obtained with respect to PC, which indicates an improvement in strength (up to 100%), in ductility and in resistance to cracking. The LF gives a better improvement in strength than the SF for a 70% $kg/m^3$ of steel proportioning.

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Then, the work is directed towards the study of the behavior of SFC small slabs. In this part I of the paper, the study will be focused on the behavior of the slabs subjected to distributed loads. The behavior under such load represent a new study in this field.
It is known that the main use of SFC is to be employed in the ground slab of industrial floors. The aim of this paper is to investigate the behavior of such slabs under different loading condition. At first a presentation of the optimal design is chosen.
At first a presentation of the optimal design is chosen. Then, the work is directed towards the study of the behavior of SFC small slabs. In this part I of the paper, the study will be focused on the behavior of the slabs subjected to distributed loads.
This experimental study allowed us to highlight the improvements on the concrete by adding steel fiber. The results showed that:

제안 방법

Twenty 1,100 ×1,100 × 60 mm small slabs simply supported on their four sides were prepared to study the flexure characteristics under a uniformly distributed load.

대상 데이터

Twenty 1,100 ×1,100 × 60 mm small slabs simply supported on their four sides were prepared to study the flexure characteristics under a uniformly distributed load. The tests were carried out using a bending machine. A uniform loading is applied through water pressure beneath the slab as illustrated in Fig.

성능/효과

1) The compressive strength of SFC increased up to 25% compared to PC, while the splitting tensile strength tensile tests showed an improvement of up to 45% of the SFC compared to PC.
2) The tests on small SFC slabs unveiled a lower deflection leading to an improvement in maximum strength (up to a 100%), in the ductility and in resistance to cracking (up to 50%).
3) The optimum size of the steel fibers recommended to act on the elastic zone (strength and cracking) or plastic zone (ductility and deformation) are different: In the elastic zone, the fibers must be numerous and small, while in the plastic zone, the fiber length must be large enough to ensure their proper anchorage in the matrix.
1 m pile grid. He concluded that the quality of a completed slab is a function of both sound design and efficient installation. Recently, Ošlejs⁷ gave an overview of the experience from the Baltics and Scandinavia in the use of the SFRC slabs over piles (on to 2.
¹¹ studied the structural behavior of the SFRC slabs on ground under a concentrated load. They concluded that a relatively low content of steel fibers effectively enhances the load-carrying capacity of the slabs on ground and that a volume fraction of steel fibers higher than 0.38% slightly improves the ultimate load but remarkably enhances the slab ductility.
Khaloo and Afshari¹⁰ studied the flexural behavior of small SFRC slabs by considering the influence of length and volumetric percentage of steel fibers on energy absorption. They concluded that addition of fibers did not significantly increase the ultimate flexural strength of SFRC slabs, but it improves the energy absorption capacity of the slabs. Recently, Sorelli et al.

참고문헌 (18)

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Newhook, J. P. and Mufti, A. A., “A Reinforcing Steel-Free Concrete Deck Slab for the Salmon River Bridge,” Concrete International, Vol. 18, No. 6, 1996, pp. 30-34.
Sargent, D. D., Ventura, C. E., Mufti, A. A., and Bakht, B., “Testing of Steel-free Bridge Decks,” Concrete International, Vol. 21, No. 8, 1999, pp. 55-61.
Marti, P., Pfyl T., Sigrit, V., and Ulaga, T., “Harmonized Test Procedures for Steel Fiber-Reinforced Concrete,” ACI Materials Journal, Vol. 96, No. 6, 1999, pp. 676-686.

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Destree, X., “Steel Fibre Reinforcement for Suspended Slabs,” Concrete, Vol. 35, No. 8, 2001, pp. 58-59.
Oslejs, J., “New Frontiers for Steel Fiber-Reinforced Concrete,” Concrete International, Vol. 30, No. 5, 2008, pp. 45-50.
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Barros, J. A. O. and Figueiras, J. A., “Flexural Behavior of SFRC: Testing and Modeling,” Journal of Material in Civil Engineering, ASCE, Vol. 11, No. 4, 1999, pp. 331-339.

상세보기
Khaloo, A. R. and Afshari, M., “Flexural Behaviour of Small Steel fibre Reinforced Concrete Slabs,” Cement and Concrete Composites, Vol. 27, No. 1, 2005, pp. 141-149.

상세보기
Sorelli, G., Meda, A., and Plizzarri, G. A., “Steel Fiber Concrete Slabs on Ground: A Structural Matter,” ACI Structural Journal, Vol. 103, No. 4, 2006, pp. 551-558.

상세보기
Rossi, P., Harrouche, N., and Belloc, A., “Methode de Composition des Betons de Fibres Metalliques,” Annales de l’ITBTP, No. 475, 1989, pp. 38-43 (In French).
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Rossi, P. and Harrouche, N., “Mix-Design and Mechanical Behavior of Some Steel-Fiber-Reinforced Concretes Used in Reinforced Concrete Structures,” Materials and Structures, Vol. 23, 1990, pp. 256-266.

상세보기
Rossi, P., “Steel Fiber Reinforced Concrete (SFRC): An example of French Research,” ACI Materials Journal, Vol. 91, No. 3, 1994, pp. 273-279.
Rossi, P., “Les Betons de Fibres Metalliques,” Presses de l’ENPC Ed., Paris, 1998 (in French).
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Experimental Study of Steel Fiber Concrete Slabs Part I: Behavior under Uniformly Distributed Loads 원문보기

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Experimental Study of Steel Fiber Concrete Slabs Part I: Behavior under Uniformly Distributed Loads 원문보기

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