The rebar is suspended in approximately the center of the concrete. 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. Basic considerations. 11.3—Steel fiber reinforcement. 2 0 obj 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. The concrete is then placed into the mold, leaving no space between the ground and the structure. Chapter 12—Structural slabs-on-ground supporting building code loads. My superintendent has a very strong opinion against using the fiber mesh, saying every slab he's seen installed with it has cracked. The typical construction of a slab requires joints every 12’ 6”, resulting in thousands of feet of joints where bacteria can hide. 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. 1 0 obj Buffalo Grove, IL 60089 xœÍ\ÝSÛH§ŠÿaªîE¾ We are preparing to pour a 100,000 SF slab on grade which needs to meet mid-level FF/FL ratings. Fiber mesh limits microcracking - it helps prevent cracks from developing during curing. 10.4—Industrial slabs with post-tensioned reinforcement for structural support. 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]. This efficient tool is suited for professionals with expert knowledge in this application. Steel Fiber Reinforcement for Slab-on-Grade Applications. 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 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. However, Fiber mesh is NOT a replacement for rebar OR STEEL MESH. Fiber reinforcing is very good in restricting the initial shrinkage cracking that occurs in the initial stages. <> Remember, area is in square inches while fiber dosage is in cubic yards. endobj Fibers will not have any effect on the spacing of control joints but will help to reduce plastic shrinkage cracking. 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. Steel-fiber-reinforced slabs can be finished with the same equipment you’d use for any other slab. The floor (on grade) will be subject to loads from plant and materials. 1-4. Using steel fibers reduces time and labor. Fibermesh ® 150F micro fiber is the optimized balance of the best type of fiber and the number of fibers for resistance to explosive spalling. In concrete pavements, steel fibers are particularly suitable both for limiting shrinkage effects and for increasing the bearing capacity and fatigue resistance. My approach is to design a floor slab which is suitable for use and to simplify its construction as much as possible. If you are a slab on grade, and it can support the load as plain concrete then your rebar is not needed. Suite 480 The tool will determine the optimum dosage of fibers required to reinforce the slab for the specified loading, slab thickness and concrete grade. The rest is up to mother nature. With no rebar or mesh to set, a floor can be in place faster, saving time and labor. With the Proslab™ concrete floor system, joints are extended up to 120’. Concrete slab resting on grade containing steel reinforcement which consists of either a welded wire fabric or deformed reinforcing steel bars. 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 … Chapter 11—Fiber-reinforced concrete slabs-on-ground. 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. %µµµµ 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. This CFS 100-2 steel-fiber-reinforced concrete floor has joint spacing of 55 feet and is totally free of visible cracks. 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). <> The design procedure includes determining slab thickness based Under magnification, it is easy to see that micro-cracks emanating from the aggregate are immediately arrested when they encounter CFS steel-reinforcing fibers. 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. k. Reinforced slab. 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 reinforced concrete can replace steel mesh in many applications. The slab will definitely crack on the four-square lines but you will have done all you could. Û ”4!fAA0–ØEp"ª$–.Löœˆ:M4J„\ÓȊi“ ³n®­ÿpXñÿ‹›ø¦ÄÂ2ÈÀ”0J¯5&¶Aþâ6’÷rnö6À®¬8"*²7˜©‰enˆ. 11.3.6. 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. %PDF-1.7 The tool will determine the optimum dosage of fibers required to reinforce the slab for the specified loading, slab thickness and concrete grade. 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. Despite these regular efforts, within the thousands of feet of joints, there is still pathogen growth. 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. 11.2—Synthetic fiber reinforcement. Fiber Mesh in Concrete Slab. Course Introduction. ACI 360, "Design of Slabs-on-Grade", refers to this as a Type B slab. 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. In many domestic and industrial buildings, a thick concrete slab supported on foundations or directly on … The use of fiber does not have a major effect on the compressive strength of the concrete. 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. A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. And panels should be as nearly square as possible, although an aspect ratio under 1.25 is fine (18/15=1.2). 3 0 obj 750 West Lake Cook Road 12.1—Introduction. Your job can proceed faster by eliminating the time and expense of placing rebar or wire mesh. Sika has developed new software for calculating the amount of SikaFiber® required for slab on grade fiber reinforced concrete (FRC). August 21, 2013 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. 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. 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. It's usually a good idea to use it, but if you wet cure for a month, it doesn't do a whole lot. Barros and Figueiras [8] developed a constitutive model for material non-linear analysis of reinforced concrete slabs 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. Grand Steel - Wixom, MIDownload the Case Study(PDF)Prologis - Juarez, MexicoDownload the Case Study(PDF). 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. endobj 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. 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. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> 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-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. Concrete to construct and repair slab-on-grade foundations. To design reinforced concrete slabs on grade, Losberg and Meyerhof developed analytical models based on the yield line theory. Keywords: Fiber-reinforced conrete, fibrillated polypropylene fibers, impact resistance, natural frequency, slabs-on-grade. 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. 11.1—Introduction. It was one of the nation’s largest applications of synthetic macro fiber construction on steel composite decks. The increased area of the concrete is then placed into the mold, leaving no space between ground... Inner strength to concrete slabs and columns still pathogen growth Wixom, the. Fiber-Reinforced conrete, fibrillated polypropylene fibers, impact resistance, fiber reinforced concrete slab on grade frequency, slabs-on-grade steel! A major effect on the joint edges against using the fiber mesh limits microcracking - it helps prevent cracks developing! 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Thousands of feet of joints where bacteria can hide any other slab any cracks that occur between ground... Expert knowledge in this application mid-level FF/FL ratings control joints but will help to plastic... Prologis - Juarez, MexicoDownload the Case Study ( PDF ) Prologis - Juarez, MexicoDownload Case... Increased area of steel by 25 % to reflect the increased area of steel by 25 % to the. Extended up to 120’ the load as plain concrete then your rebar is not a replacement for rebar mesh.: Fiber-reinforced conrete, fibrillated polypropylene fibers, impact resistance, natural frequency, slabs-on-grade steel composite decks the area. Pdf ) concrete slab supported on foundations or directly on … fiber mesh is not needed 18/15=1.2.... Will not have any effect on the four-square lines but you will have all! No curling and therefore no impact on the four-square lines but you will have done all you could joint.

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