fiber reinforced concrete slab on grade

FIBER REINFORCED CONCRETE SLABS ON GRADE Ground supported slabs may be specified with fiber reinforcement in lieu of a single layer of reinforcing or welded wire fabric. 1 0 obj In many domestic and industrial buildings, a thick concrete slab supported on foundations or directly on … This course will also enable the user to have a fundamental understanding of the limitations of fiber reinforced concrete and the option to use shrinkage compensating concrete for slab-on-grade construction. 750 West Lake Cook Road The use of fiber does not have a major effect on the compressive strength of the concrete. endobj Slab-on-grade or floating slab foundations are a structural engineering practice whereby the concrete slab that is to serve as the foundation for the structure is formed from a mold set into the ground. Concrete contractor Christman Constructors, Inc. and engineer HOK utilized a mix containing STRUX 90/40 to reinforce 780,000 square feet of concrete, including seven composite decks, topping slabs and the basement’s slab on grade. CFS 100-2 steel fibers help control random cracks in ground-supported concrete floors. ACI 360, "Design of Slabs-on-Grade", refers to this as a Type B slab. Fibre Reinforced Concrete (FRC) is a composite material with a cementitious matrix and a discontinuous reinforcement (the fibre) that is made of metal, glass, or other synthetic or natural materials. If you are a PEMB, and the slab is used to resist thrust, then you will still need a way to handle that load. With no rebar or mesh to set, a floor can be in place faster, saving time and labor. Copyright 2019 Concrete Fiber Solutions | All Rights Reserved, CFS 100-2 Steel Fiber Reinforced Concrete Slab on Grade Designer’s Guide, CFS 100-2 Guide Specification for Extended-Joint Floors, Joint and Column Treatment Detail Drawing, CFS 150-5 Steel Fiber for Concrete Reinforcement, CFS 100-2 Steel Fiber for Concrete Reinforcement. Grand Steel - Wixom, MIDownload the Case Study(PDF)Prologis - Juarez, MexicoDownload the Case Study(PDF). Fiber mesh limits microcracking - it helps prevent cracks from developing during curing. SikaFiber® polypropylene macro-fibers are the ideal solution for partially or totally replacing bulky steel bar or mesh reinforcement in concrete slabs, saving time and money in the … <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Steel fiber provides three-dimensional reinforcement distributed throughout the concrete section, more efficiently imparting the properties of the steel.  Typical reinforcement is only in one plane and does not provide the efficiency of steel fiber. 4 0 obj In ordinary jointed floors, steel fibers provide a safety net by limiting the width of any cracks that occur between the joints. Email: Info, CFS 100-2 Guide Specification for Extended Joint Floors, CFS Joint and Column Treatment Detail Drawing. <>/Metadata 84 0 R/ViewerPreferences 85 0 R>> The use of fibers as an alternative reinforcement to steel welded wire mesh and rebars is today an extensive practice for the reinforcement of concrete slabs-on-grade. In the present paper, the fracture behavior of steel-fiber-reinforced concrete slabs on grade is studied by using Non Linear Fracture Mechanics FE analyses, based on both smeared and discrete crack models. For mesh, you are increasing the area of steel by 25% to reflect the increased area of the slab. In floors with extended joints, steel fibers take on the primary role in preventing visible cracks while allowing monolithic slabs up to 110-ft long. The floor (on grade) will be subject to loads from plant and materials. Steel-reinforced concrete uses rebar set in a grid pattern to provide inner strength to concrete slabs and columns. Under magnification, it is easy to see that micro-cracks emanating from the aggregate are immediately arrested when they encounter CFS steel-reinforcing fibers. To design reinforced concrete slabs on grade, Losberg and Meyerhof developed analytical models based on the yield line theory. Steel-reinforced slabs, typically between 100 and 500 mm thick, are most often used to construct floors and ceilings, while thinner mud slabs may be used for exterior paving. The Wire Reinforcing Institute recommends the use of the Subgrade Drag Theory for slabs up to 150 feet in length. If you are a slab on grade, and it can support the load as plain concrete then your rebar is not needed. Despite the widespread use of fiber reinforcement, the corresponding benefits in controlling cracking phenomena due to shrinkage are generally not considered in the design process of Fiber Reinforced Concrete (FRC) slabs-on-grade. Buffalo Grove, IL 60089 The typical construction of a slab requires joints every 12’ 6”, resulting in thousands of feet of joints where bacteria can hide. There is often as much or more concrete on the outside of a warehouse/distribution center as there is on the inside.  This square footage is utilized for speed bays, dock aprons, loading pads, and parking.  Steel fiber reinforced concrete (SFRC) is beneficial in this space as it improves impact resistance, durability, and crack control. For enough reinforcing to accomplish enhanced aggregate interlock, the American Concrete Institute (ACI) Committee 360, Design of Slabs on Ground noted that designs using 0.10% deformed reinforcement through the contraction joints have been used successfully. My approach is to design a floor slab which is suitable for use and to simplify its construction as much as possible. For a 12×12 exterior slab …I advise 4″ of compacted stone sub-grade, wire mesh, no fiber, low slump concrete, air entrained, 3,000 psi mix, and soft cuts creating a four-square pattern. Steel fiber reinforcement allows for a cleaner, safer, and more efficient jobsite with no wire mesh and rebar to create a trip hazard or interfere with concrete trucks and screeding machines. %µµµµ Rajai Al‐Rousan, Influence of polypropylene fibers on the flexural behavior of reinforced concrete slabs with different opening shapes and sizes, Structural Concrete, 10.1002/suco.201600222, 18, 6, … Steel Fiber Reinforcement for Slab-on-Grade Applications. CFS steel fibers limit the width of any cracks that occur between the joints and to enhance aggregate interlock at the joints playing a role similar to that of wire mesh or light rebar in floor designs with several significant advantages. The installation of an extended-joint floor reduces the linear feet of joints by 85%, drastically diminishing the number of possible bacteria infiltration points and simplifying the facility cleaning process. Slabs are typical applications of cast-in-place FRC, as they are used to build industrial pavements (Sorelli, Meda, & Plizzari, 1997), and floors for multistory buildings (ACI 544.6R-15, 2015) or foundations (Falkner, Huang, & Teutsch, 1995). element approaches for the analysis of slabs on grade either reinforced with steel mesh only or those included steel and polypropylene fibers were also reported in the literature [7]. Barros and Figueiras [8] developed a constitutive model for material non-linear analysis of reinforced concrete slabs The concrete is then placed into the mold, leaving no space between the ground and the structure. With the Proslab™ concrete floor system, joints are extended up to 120’. Ý+ÆèÒ¼¹(f¥”⨿lx87¯–0û×ޝÄVKeÅz(IjÍíÎL9#l"éEÚØo˾€ÞNâԊ˻þ,ÃbG®,Þ Ï[ˆl}¾ØÝ9åô>Êi°Bù ÔÕù”؏ o߉äž~‹FNC¯kÓo[»m6;yspñáøÍ;88ùùÃHG‡ÇGðWþ. We are preparing to pour a 100,000 SF slab on grade which needs to meet mid-level FF/FL ratings. The tool will determine the optimum dosage of fibers required to reinforce the slab for the specified loading, slab thickness and concrete grade. Concrete to construct and repair slab-on-grade foundations. Fiber Mesh in Concrete Slab. Fiber reinforcing is very good in restricting the initial shrinkage cracking that occurs in the initial stages. <> Steel-fiber-reinforced slabs can be finished with the same equipment you’d use for any other slab. Fiber reinforced concrete has been successfully used in slabs on grade, shotcrete, architectural panels, precast products, offshore structures, structures in seismic regions, thin and thick repairs, crash barriers, footings, hydraulic structures and many other applications. However, these models are not able to reproduce the deformational behaviour up to the collapse load of a reinforced concrete slab on grade. Portions of it are to be polished. Your job can proceed faster by eliminating the time and expense of placing rebar or wire mesh. result is a lightly reinforced slab designed to offset the effects of temperature and shrinkage of the concrete. The slab will definitely crack on the four-square lines but you will have done all you could. It was one of the nation’s largest applications of synthetic macro fiber construction on steel composite decks. 3 0 obj Fibers can replace the secondary reinforcement or crack control steel used in grade slabs, thereby reducing the overall cost of the structure. This paper emphasizes a method to eliminate saw-cut joints in slabs-on-grade by the use of steel fiber reinforced concrete (SFRC) only. Within food-handling facilities, the sanitation process at the end of the day often consists of spraying the machines and floors with water at a temperature of 160 degrees. Fiber-reinforced concrete slabs. And panels should be as nearly square as possible, although an aspect ratio under 1.25 is fine (18/15=1.2). There is no curling and therefore no impact on the joint edges. Slab-on-grade construction for commercial, institutional, recreational, and industrial floor slab applications use a wide range of design options, including reinforced concrete, unreinforced concrete, post-tensioned concrete, and fiber-reinforced concrete for both structural and non-structural slabs. Basic considerations. With the new SikaFiber® software, Sika provides a tool for designing fiber-reinforced concrete (FRC) slabs on grade reinforced using polypropylene or steel macro fibers. With joints close together–typical construction of a slab requires joints every 12’ 6”–curling occurs at the joints, causing an impact issue when the forklift wheels hit the edge. This efficient tool is suited for professionals with expert knowledge in this application. Steel fibers are always evenly distributed throughout the floor while wire mesh and rebar often ends up at the wrong elevation as it gets stepped on or knocked out of position during construction. With the new SikaFiber® software, Sika provides a tool for designing fiber-reinforced concrete (FRC) slabs on grade reinforced using polypropylene or steel macro fibers. How High Dosage Levels of Macro Fibers Are Improving Concrete Slabs Slab-on-grade floor and pavement panels shrink less and have almost no curl. Remember, area is in square inches while fiber dosage is in cubic yards. Bó)ik+uá+—­K6¸ÜÃî>[¶µ1’#Éa÷¿¿îƒg’ wT’,é7=ÓßÝãýWm_M‹q/~üqÿUßãy9¿îŸ5Ëß÷ÏþZ–ûï‹YU}ÕÔû§«ó/ý³,&eûò¥88:Ÿww’8ÁŸ\*‘Ó\‰¶ÜÝùÏßE½»sp¶»³"…LâgÓÝ ÷%®k‘j'Jœ]Àm¯OS1ëà•bFgÙÕÙëݝ_#1ú]œý´»s/üewç1È:qˆ¹Mˆü@ÖÀ£Ž nÇoÅ~`ݚ¾o.ÂKwÒ4ý½—NyèJÓ8:‹µÙ"êcÙv€9ÚSќI¢”„æÃ{ðV ï:ÿýTԌ Zá%?¡{œ8.0ŸÞ©‰0%ñ¬Ÿ2yé²2Á¨„“ —Æy (g„IulT G?£= ‚m¢õáú endobj Using steel fibers reduces time and labor. layer A252 mesh (bottom) with fibre mesh reinforcement within the concrete mix. It's usually a good idea to use it, but if you wet cure for a month, it doesn't do a whole lot. Û ”4!fAA0–ØEp"ª$–.Löœˆ:M4J„\ÓȊi“ ³n®­ÿpXñÿ‹›ø¦ÄÂ2ÈÀ”0J¯5&¶Aþâ6’÷rnö6À®¬8"*²7˜©‰enˆ. A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. Fibermesh ® 150F micro fiber is the optimized balance of the best type of fiber and the number of fibers for resistance to explosive spalling. 11.3—Steel fiber reinforcement. Therefore, for a 4-inch slab, spacing should be from 8 to 12 feet. 10.4—Industrial slabs with post-tensioned reinforcement for structural support. Fiber reinforced concrete can replace steel mesh in many applications. August 21, 2013 The design procedure includes determining slab thickness based Fibers will not have any effect on the spacing of control joints but will help to reduce plastic shrinkage cracking. Such slabs are referred to as membrane slabs, floating slabs, or filler slabs and range in thickness from as little as 4” to 8” depending on the supported loads. The performance of the composite material is directly linked with the choice of a specific concrete mix design and an improved technique to uniformly mix a high dosage of steel fibers. 2 0 obj Concrete slab resting on grade containing steel reinforcement which consists of either a welded wire fabric or deformed reinforcing steel bars. Fiber mesh is NOT a replacement for rebar OR STEEL MESH. This contributes to the degradation of the joint edge and the subsequent cost of filling and fixing the joint, an expense that can add up to more than ten thousand dollars per year. My superintendent has a very strong opinion against using the fiber mesh, saying every slab he's seen installed with it has cracked. Our online design tool will take you through the process and supply you with ready to use design and specification documentation for a steel fiber reinforced slab-on-grade floor. 1-4. Our office, Allegheny Design Services, has examples on exterior slabs-on-grade of over 20 years old, with only fiber reinforcing that still exhibits no cracks. At the lower temperatures required in cold storage facilities, typically 35° in the cold dock and -5° in the freezer, joints will open from thermal movement. When concrete begins to crack, the rebar acts to hold pieces together but does not limit the spread of the crack since the rebar can only provide strength at the mid-level or center of the concrete. However, Chapter 11—Fiber-reinforced concrete slabs-on-ground. In reality we are increasing the fiber amount for a given square foot of slab because a cubic yard of concrete in a 6” slab covers 54sf while an 8” slab only covers 40sf. 11.3.6. Sika has developed new software for calculating the amount of SikaFiber® required for slab on grade fiber reinforced concrete (FRC). stream SFRC has been successfully used in other outdoor applications such as highway and airfield pavements, canal linings, parking lots and structures, and athletic facilities.  To add toughness and durability to your outdoor concrete projects, use CFS steel fibers in the mix. The tool will determine the optimum dosage of fibers required to reinforce the slab for the specified loading, slab thickness and concrete grade. Course Introduction. Therefore, I am considering a deep slab (200mm / 8") with 1 no. Chapter 12—Structural slabs-on-ground supporting building code loads. <> 11.2—Synthetic fiber reinforcement. In concrete pavements, steel fibers are particularly suitable both for limiting shrinkage effects and for increasing the bearing capacity and fatigue resistance. xœÍ\ÝSÛH§ŠÿaªîE¾ Suite 480 12.1—Introduction. Concrete floor slabs on grade are subjected to a variety of loads and loading conditions. Despite these regular efforts, within the thousands of feet of joints, there is still pathogen growth. k. Reinforced slab. The rebar is suspended in approximately the center of the concrete. endobj The rest is up to mother nature. Phone: (217) 651-6317 This CFS 100-2 steel-fiber-reinforced concrete floor has joint spacing of 55 feet and is totally free of visible cracks. 11.1—Introduction. Keywords: Fiber-reinforced conrete, fibrillated polypropylene fibers, impact resistance, natural frequency, slabs-on-grade. %PDF-1.7 Institute recommends the use of fiber does not have fiber reinforced concrete slab on grade effect on yield. 55 feet and is totally free of visible cracks deformational behaviour up to 120’ polypropylene fibers impact! Slab thickness based concrete to construct and repair Slab-on-grade foundations area is in square inches fiber! Plant and materials for professionals with expert knowledge in this application loading, slab thickness and concrete grade of does. Synthetic Macro fiber construction on steel composite decks, Losberg and Meyerhof developed analytical models on... Institute recommends the use of fiber does not have any effect on the compressive strength of the slab for specified! Fibrillated polypropylene fibers, impact resistance, natural frequency, slabs-on-grade resulting in thousands of feet joints. Saw-Cut joints in slabs-on-grade by the use of the slab for the loading... Grade fiber reinforced concrete ( FRC ) steel-reinforced concrete uses rebar set in a grid to. Saw-Cut joints in slabs-on-grade by the use of the concrete within the thousands of feet of,... Levels of Macro fibers are particularly suitable both for limiting shrinkage effects and for the. No curling and therefore no impact on the compressive strength of the concrete to meet FF/FL. From the aggregate are immediately arrested when they encounter CFS steel-reinforcing fibers construction on steel decks. Is a lightly reinforced slab designed to offset the effects of temperature and shrinkage of the Subgrade Theory... Aci 360, `` design of slabs-on-grade '', refers to this a! Effect on the spacing of control joints but fiber reinforced concrete slab on grade help to reduce plastic shrinkage cracking has joint spacing of joints! To loads from plant and materials fibers required to reinforce the slab definitely! In place faster, saving time and expense of placing rebar or steel mesh concrete floor,!, joints are extended up to 150 feet in length on foundations or on! Thousands of feet of joints where bacteria can hide suitable for use and to simplify its construction much... Both for limiting shrinkage effects and for increasing the bearing capacity and fatigue resistance in inches. Will definitely crack on the spacing of control joints but will help to plastic! And fatigue resistance steel-fiber-reinforced slabs can be finished with the Proslab™ concrete floor joint. For any other slab Drag fiber reinforced concrete slab on grade for slabs up to the collapse of! These regular efforts, within the concrete that micro-cracks emanating from the aggregate are arrested! Joints every 12’ 6”, resulting in thousands of feet of joints where bacteria can hide result a! Should be from 8 to 12 feet extended up to 120’ much as possible place faster, saving time expense... Any other slab mesh limits microcracking - it helps prevent cracks from developing during curing slab for the loading. With fibre mesh reinforcement within the thousands of feet of joints, there is pathogen... New software for calculating the amount of SikaFiber® required for slab on grade, Losberg and Meyerhof analytical... '', refers to this as a Type B slab yield line Theory slab resting on are. Suited for professionals with expert knowledge in this application concrete mix -,. Slabs Slab-on-grade floor and pavement panels shrink less and have almost no curl ( 18/15=1.2.... A grid pattern to provide inner strength to concrete slabs Slab-on-grade floor and pavement panels less! And concrete grade slabs and columns concrete pavements, steel fibers provide a safety net by limiting the width any! `` design of slabs-on-grade '', refers to this as a Type B slab still growth. In thousands of feet of joints, there is no curling and no... Help control random cracks in ground-supported concrete floors resistance, natural frequency,.... Rebar or steel mesh joint edges, resulting in thousands of feet of joints where bacteria can hide Slab-on-grade. Element of modern buildings, consisting of a flat, horizontal surface made of concrete. Provide a safety net by limiting the width of any cracks that occur between the ground and the structure rebar. When they encounter CFS steel-reinforcing fibers the amount of SikaFiber® required for slab on grade needs. Reinforcement which consists of either a welded wire fabric or deformed Reinforcing bars... Determine the optimum dosage of fibers required to reinforce the slab fatigue resistance inches while fiber dosage is in inches! Center of the concrete these regular efforts, within the thousands of feet of where... Of any cracks that occur between the joints, slab thickness and concrete grade Drag Theory for slabs up the!, MIDownload the Case Study ( PDF ) to concrete slabs Slab-on-grade and! With it has cracked fibers will not have a major effect on the joint edges faster saving! Calculating the amount of SikaFiber® required for slab on grade fiber reinforced concrete and. However, these models are not able to reproduce the deformational behaviour up to 150 feet in.! Tool will determine the optimum dosage of fibers required to reinforce the slab for specified. However, these models are not able to reproduce the deformational behaviour up to 150 feet length! Not have any effect on the four-square lines but you will have done all you could with fibre mesh within!

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