Fiberreinforced concrete smart materials and smart sensors aci fall 2011 convention october 16 20, cincinnati, oh aci web sessions antoine naaman, faci, is a professor in the department of civil and environmental engineering at the university of michigan. Fibers in concrete help reduce shrinkage cracks, increase strength, increase energy absorption and reduces dangerous spalling at high. Studies on fibre reinforced concrete, international journal of civil engineering and technology, volume 7, issue 5, september october 2016. Fibers with a small average diameter have corresponding low flexural stiffness and thus have a certain ability to conform to the shape of the space they occupy in the paste phase of the concrete mixture. These natural fibers have excellent physical and mechanical properties and can be utilized more effectively. Experimental study on hybrid effect evaluation of fiber. Segregation was reduced by using steel fibers, and the fiber orientation in the. The usefulness of fiber reinforced concrete frc in various civil engineering applications is indisputable. While the increase in shear strength of steel fibre reinforced concrete sfrc is well recognized, it has yet to be found common application of this material in building structures and there is no existing national standard that treats sfrc in a systematic. Therefore it is better to consider an under reinforced concrete. A study on structural characteristics of sisal fibre. In this study, some mechanical properties of sisal fibre reinforced concrete were examined using the tensile test and the fourpoint bending test the flexural strength. Macro synthetic fibres are typically used in structural concrete as replacement for nominal bar or fabric reinforcement.
Sika is the leading company for fiberreinforced concrete solutions. Steel fibres are being costlier at present, frc becomes very expensive compared to r. Steel fibre reinforced concrete as a structural material. Fibrereinforced concrete frc extends the versatility of concrete as a construction material, offers a potential to simplify the construction process and, when. State of the art report 162 pages, isbn 9782883941236, october 2017 pdf format.
Within fib federation internationale du beton, the special activity group 5 is preparing a new fib model code that aims to update the previous ceb. During the past two decades, there has been considerable interest in the study of fiber reinforced concrete and its appli cations to several types of structures. Cracks in reinforced concrete members extended freely until encountering a rebar. Mechanical properties of sisal,fibre reinforced concrete. Thus unlike plain concrete, a fiber reinforced concrete specimen does not break immediately after initiation of the first crack. Fiberreinforced concrete seminar ppt with pdf report. Introduction to steel fiber reinforced concrete on. The addition of steel fibre increases the properties of. Shear behaviour of steel fibre reinforced concrete beams. The use of fibre reinforced concrete frc for designing structural members in bending and shear has recently been addressed in the fib model code 2010. Fibers suitable for reinforcing concrete have been produced from steel, glass, and organic polymers synthetic fibers. Fibre reinforced concrete using domestic waste plastics as fibres.
In this study, mechanical properties of sisal fibre reinforced concrete were examined using the tensile test, and the fourpoint bending test. Properties and applications offiber reinforced concrete faisal fouad wafa associate professor, civil engineering department, faculty ofengineering, king abdulaziz university, jeddah, saudi arabia. The over reinforced fails without giving prior warning and under reinforced fails but gives a deformation warning before it fails. Pdf steel fibers and steel fiber reinforced concrete in. Two forms of reinforcements were examined under varying volume fractions. Fiber reinforced concrete frc is concrete consisting fibrous material which increases its structural purity. Crack width profiles for fibrereinforced concrete elements with conventional reinforcement master of science thesis in the masters programme structural engineering and building technology niclas gorander christopher hallden department of civil and environmental engineering division of structural engineering concrete structures. This research describes experimental studies on the use of sisal and banana fiber to enhance the strength and applications of concrete. Fiber reinforced concrete frc examination of fractured specimens of fiber reinforced concrete shows that failure takes place primarily due to fiber pullout or debonding. Crack width profiles for fibre reinforced concrete elements. The advantage of sisal fibre reinforced concrete composite over other conventional materials seems largely from their higher specific strength, stiffness, and fatigue characteristics, which enable. Pdf the use of sisal fibre as reinforcement in cement. The swedish concrete association published a report on steel fibre reinforced concrete in 1995.
Due to the increased tensile strength, the scabbing damages at the. Fibres are usually made of steel, but they can also be made of carbon,plastic,glass. Fiber reinforced concrete frc is a composite material consisting of cement based matrix with an ordered or random distribution of fiber which can be steel, nylon, polythene etc. In the present paper, the shear behaviour of prestressed elements has been investigated by means of experimental tests on full scale beams. It holds short discrete fibers that are uniformly distributed and circumstances oriented. The experimental set up for various tests were described below. Structures are a combination of traditionally reinforced concrete and fibre reinforced concrete fig. Providing and laying 40 mm steel fiber reinforced cement concrete in pavement in panels having area not more than 1. The structural behaviour of steelfibrereinforced concrete beams was studied using nonlinear finiteelement analysis and existing experimental data. However, because of the inherent material properties of fibre concrete, the presence of fibres in the body of the concrete or the provision of a tensile skin of fibre concrete can be expected to improve the resistance of conventionally reinforced structural members to cracking, deflection and other serviceability conditions.
On the other hand, steelfiber reinforced concrete sfrc has been used for. At that time, it was considered to be one of the worlds most modern and straightforward handbooks on the design of steel fibre reinforced concrete structures. Therefore, to promote the use of concrete reinforced with vegetable fibers could be a way to improve concrete durability and also sustainable construction. Fibre reinforced concrete frc is a cement based composite material reinforced with discrete, usually randomly distributed, fibres. For instance, steel fibers are supposed to strengthen concrete in the sacle of coarse aggregate, pp or pva fibers are suitable for the fine. Sep 10, 2009 although the use of fibre reinforced concrete frc for structural applications is continuously increasing, it is still limited with respect to its potentials, mainly due to the lack of international building codes for frc structural elements.
He is a member of aci committees 363, highstrength concrete. Fiber reinforced concrete frc is concrete made primarily of hydraulic cements, aggregates, and discrete reinforcing fibers. Natural fibre reinforced concrete blocks david stephens, university of durbanwestville, south africa. Fiber reinforced concrete frc is a new structural material which is gaining increasing importance. Nishanthi, experimental study on glass fiber reinforced concrete by partial replacement of coarse aggregate by waste ceramic tiles, international. Jan 29, 2014 they also reduce the permeability of concrete and thus reduce bleeding of water. Fibrereinforced concrete for industrial construction core. Fiber reinforced concrete has small distinct fibers that are homogeneously dispersed and oriented haphazardly. What is fibre reinforced concrete frc is a portland cement reinforced with more or less randomly distributed fibres. The demand for high strength, crack, resistant and. Crimped and hooked end steel fibre of length 50 mm and an aspect ratio equal to 50 was added to concrete in different proportions i. Experimental study on basic mechanical properties of basalt.
Confirming to is 5161959 15 in present work weigh batching hand mixing is used to study cube compression test, flexural test on beams, on plain and steel fibre reinforced concrete sfrc were carried on number of samples. Fiberreinforced concrete frc is concrete containing fibrous material which increases its structural integrity. Naturally occurring asbestos fibers and vegetable fibers, such as sisal and jute, are also used for. Concrete reinforced with fibres which are usually steel, glass or plastic fibres is less expensive than handtied rebar, while still increasing the tensile strength many times. The additional use of polypropylene fibers lead to a higher ductility of the concrete slabs. Steel fibre composite floor another example of steel fibres application in the structural elements is a thin shell structure covered buildings located in the european oceanographic park in valencia. A thin and short fibre, for example short hairshaped glass fibre, will only be effective the first hours. What are the disadvantages of fiber reinforced concrete. The possibility of substituting traditional transverse reinforcement stirrups for steel fibres in precast elements can significantly reduce production costs. Thus, the reinforcement effect of fiber reinforced concrete was increased, and the pulling ability of fibers was limited 28,29. Steel fibre reinforced concrete is a con crete according to ds en 2061, to which steel fibres are added to achieve certain properties. The balling effect of fibres in frc is very undesirable. Any fibres that appear on the surface will quickly wear off under light traffic or degrade due to uv radiation. Fibres in reinforced concrete structures analysis, experiments and design anette jansson department of civil and environmental engineering division of structural engineering chalmers university of technology abstract potential benefits from fibres in concrete are improved crack control and the possibility of more slender structures.
Keywords compressive strength, ductility, flexural strength, fibre reinforced concrete, steel fiber. Pdf the use of sisal fibre as reinforcement in cement based. Fibers used are steel fibers, synthetic fibers, glass fibers, natural fibers, asbestos fibers and carbon fibers. Test results for concretes obtained by using water blended with yeast granules are also reported in this paper. Precast tunnel segments in fibrereinforced concrete. Strength aspects of glass fibre reinforced concrete. The flexural strength, tensile strength, toughness and the interfacial bond strength were examined. Fibre is a small piece of reinforcing material which increases structural integrity. Properties and applications offiber reinforced concrete. Fibre reinforced concrete is a composite material, made of concrete matrix with the addition of fibres. Sisal fibre sf is the natural fibre extracted from the tree leaves agave sisalana tree, it is possible to use directly to.
Pdf irjet natural sisal fibre reinforced concrete with. It is recommended up to 10% of replacement of cement by gsa and 2 % addition of sf provide optimum values from investigation and economic consideration. Apr 02, 2014 steelfiber reinforced concrete for conventional construction work as well by elhuyar fundazioa this is the threedimensional expression of the distribution of the steel fibers. Fiber reinforced concrete is used when there is requirement for elimination small cracks. Fiber reinforced concrete is a type of concrete that includes fibrous substances that increase its structural strength and cohesion. Introduction by utilizing the natural products and wastes is very much helpful to the environmental protection. Fiber reinforced concrete has all but completely replaced bar in underground construction industry such as tunnel segments where almost all tunnel linings are fiber reinforced in lieu of using rebar. Abstract fibres are generally used as resistance of cracking and strengthening of concrete. It contains short discrete fibers that are uniformly. Shear capacity of steel fibre reinforced concrete beams.
Shear behaviour of steelfibre reinforced concrete simply supported. As soon as some tension is developed, it will lose its stiffness. Indeed, some fibers actually reduce the compressive strength of concrete. Steelfiber reinforced concrete for conventional construction. Applications of fiber reinforced concrete in pavements. Tests concern beams with conventional as well as steel fibre reinforcement.
This thesis aimed at understanding the longterm performance of concrete reinforced with recycled steel fibres recovered from postconsumer tyres. Sumit thakur civil fiber reinforced concrete frc seminar and ppt with pdf report. Effects of steel fibres on cracking in reinforced concrete. Mar 06, 2016 fiber reinforced concrete is used to improve the performance of concrete cracking and shrinkage problems. Precast tunnel segments in fibrereinforced concrete pdf the. Whilst natural fibres have been used to reinforce construction materials since time immemorial the use of straw in sundried mud bricks or the strengthening of mortar with horsehair being typical examples study. In this project, i am going to carry out test on steel fibre reinforced concrete to. Pdf a study on durability of sisal fibre reinforced. Fiber reinforced concrete types, properties and advantages.
428 588 628 1034 737 388 1029 1211 868 32 894 1121 1251 256 488 1337 617 398 794 917 827 272 838 175 1064 410 1176 836 68 909 1374 1487 905 781 1106 69 1135 1194 1415 602