fiber reinforced concrete slab on grade

If you are a slab on grade, and it can support the load as plain concrete then your rebar is not needed. %PDF-1.7 Fibermesh ® 150F micro fiber is the optimized balance of the best type of fiber and the number of fibers for resistance to explosive spalling. 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. A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. result is a lightly reinforced slab designed to offset the effects of temperature and shrinkage of the concrete. 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 the new SikaFiber® software, Sika provides a tool for designing fiber-reinforced concrete (FRC) slabs on grade reinforced using polypropylene or steel macro fibers. <> Suite 480 Keywords: Fiber-reinforced conrete, fibrillated polypropylene fibers, impact resistance, natural frequency, slabs-on-grade. This paper emphasizes a method to eliminate saw-cut joints in slabs-on-grade by the use of steel fiber reinforced concrete (SFRC) only. CFS 100-2 steel fibers help control random cracks in ground-supported concrete floors. However, 2 0 obj And panels should be as nearly square as possible, although an aspect ratio under 1.25 is fine (18/15=1.2). Steel-reinforced concrete uses rebar set in a grid pattern to provide inner strength to concrete slabs and columns. The tool will determine the optimum dosage of fibers required to reinforce the slab for the specified loading, slab thickness and concrete grade. endobj 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. The design procedure includes determining slab thickness based 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. My approach is to design a floor slab which is suitable for use and to simplify its construction as much as possible. 1-4. 1 0 obj In ordinary jointed floors, steel fibers provide a safety net by limiting the width of any cracks that occur between the joints. There is no curling and therefore no impact on the joint edges. 3 0 obj 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. 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. 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. Portions of it are to be polished. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> In concrete pavements, steel fibers are particularly suitable both for limiting shrinkage effects and for increasing the bearing capacity and fatigue resistance. layer A252 mesh (bottom) with fibre mesh reinforcement within the concrete mix. Concrete to construct and repair slab-on-grade foundations. 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. This efficient tool is suited for professionals with expert knowledge in this application. 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. Fibers can replace the secondary reinforcement or crack control steel used in grade slabs, thereby reducing the overall cost of the structure. Despite these regular efforts, within the thousands of feet of joints, there is still pathogen growth. The rest is up to mother nature. The floor (on grade) will be subject to loads from plant and materials. The typical construction of a slab requires joints every 12’ 6”, resulting in thousands of feet of joints where bacteria can hide. The rebar is suspended in approximately the center of the concrete. 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. 12.1—Introduction. 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. In many domestic and industrial buildings, a thick concrete slab supported on foundations or directly on … Concrete floor slabs on grade are subjected to a variety of loads and loading conditions. Concrete slab resting on grade containing steel reinforcement which consists of either a welded wire fabric or deformed reinforcing steel bars. ACI 360, "Design of Slabs-on-Grade", refers to this as a Type B slab. 4 0 obj Sika has developed new software for calculating the amount of SikaFiber® required for slab on grade fiber reinforced concrete (FRC). Using steel fibers reduces time and labor. xœÍ\ÝSÛH§ŠÿaªîE¾ Chapter 11—Fiber-reinforced concrete slabs-on-ground. It was one of the nation’s largest applications of synthetic macro fiber construction on steel composite decks. This CFS 100-2 steel-fiber-reinforced concrete floor has joint spacing of 55 feet and is totally free of visible cracks. Steel-fiber-reinforced slabs can be finished with the same equipment you’d use for any other slab. It's usually a good idea to use it, but if you wet cure for a month, it doesn't do a whole lot. Basic considerations. 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. The tool will determine the optimum dosage of fibers required to reinforce the slab for the specified loading, slab thickness and concrete grade. However, these models are not able to reproduce the deformational behaviour up to the collapse load of a reinforced concrete slab on grade. <>/Metadata 84 0 R/ViewerPreferences 85 0 R>> k. Reinforced 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. Your job can proceed faster by eliminating the time and expense of placing rebar or wire mesh. endobj 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. 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. 11.2—Synthetic fiber reinforcement. stream Fiber mesh limits microcracking - it helps prevent cracks from developing during curing. 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. 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. Chapter 12—Structural slabs-on-ground supporting building code loads. Therefore, for a 4-inch slab, spacing should be from 8 to 12 feet. Therefore, I am considering a deep slab (200mm / 8") with 1 no. 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. 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 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. 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, … 750 West Lake Cook Road Barros and Figueiras [8] developed a constitutive model for material non-linear analysis of reinforced concrete slabs 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 … 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. 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. Fiber Mesh in Concrete Slab. 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. 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. 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. %µµµµ Fiber mesh is NOT a replacement for rebar OR STEEL MESH. Phone: (217) 651-6317 Under magnification, it is easy to see that micro-cracks emanating from the aggregate are immediately arrested when they encounter CFS steel-reinforcing fibers. Remember, area is in square inches while fiber dosage is in cubic yards. For mesh, you are increasing the area of steel by 25% to reflect the increased area of the slab. The slab will definitely crack on the four-square lines but you will have done all you could. 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. 11.3—Steel fiber reinforcement. 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. 11.1—Introduction. Fiber-reinforced concrete slabs. To design reinforced concrete slabs on grade, Losberg and Meyerhof developed analytical models based on the yield line theory. The use of fiber does not have a major effect on the compressive strength of the concrete. endobj 11.3.6. Û ”4!fAA0–ØEp"ª$–.Löœˆ:M4J„\ÓȊi“ ³n®­ÿpXñÿ‹›ø¦ÄÂ2ÈÀ”0J¯5&¶Aþâ6’÷rnö6À®¬8"*²7˜©‰enˆ. 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. 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. Steel Fiber Reinforcement for Slab-on-Grade Applications. The Wire Reinforcing Institute recommends the use of the Subgrade Drag Theory for slabs up to 150 feet in length. Buffalo Grove, IL 60089 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. 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. 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]. 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). August 21, 2013 Grand Steel - Wixom, MIDownload the Case Study(PDF)Prologis - Juarez, MexicoDownload the Case Study(PDF). 10.4—Industrial slabs with post-tensioned reinforcement for structural support. 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. With no rebar or mesh to set, a floor can be in place faster, saving time and labor. My superintendent has a very strong opinion against using the fiber mesh, saying every slab he's seen installed with it has cracked. 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. Fibers will not have any effect on the spacing of control joints but will help to reduce plastic shrinkage cracking. 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. Fiber reinforcing is very good in restricting the initial shrinkage cracking that occurs in the initial stages. 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. Course Introduction. Email: Info, CFS 100-2 Guide Specification for Extended Joint Floors, CFS Joint and Column Treatment Detail Drawing. Fiber reinforced concrete can replace steel mesh in many applications. The concrete is then placed into the mold, leaving no space between the ground and the structure. 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. We are preparing to pour a 100,000 SF slab on grade which needs to meet mid-level FF/FL ratings. 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. <>

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