August 21, 2013 The tool will determine the optimum dosage of fibers required to reinforce the slab for the specified loading, slab thickness and concrete grade. A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. 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. Fiber-reinforced concrete slabs. Fibers will not have any effect on the spacing of control joints but will help to reduce plastic shrinkage cracking. 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. Steel-reinforced concrete uses rebar set in a grid pattern to provide inner strength to concrete slabs and columns. Fiber mesh is NOT a replacement for rebar OR STEEL MESH. For mesh, you are increasing the area of steel by 25% to reflect the increased area of the slab. With the Proslab™ concrete floor system, joints are extended up to 120’. The rest is up to mother nature. Using steel fibers reduces time and labor. 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. layer A252 mesh (bottom) with fibre mesh reinforcement within the concrete mix. 12.1—Introduction. 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. Your job can proceed faster by eliminating the time and expense of placing rebar or wire mesh. To design reinforced concrete slabs on grade, Losberg and Meyerhof developed analytical models based on the yield line theory. 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. 11.3.6. Buffalo Grove, IL 60089 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. The tool will determine the optimum dosage of fibers required to reinforce the slab for the specified loading, slab thickness and concrete grade. In concrete pavements, steel fibers are particularly suitable both for limiting shrinkage effects and for increasing the bearing capacity and fatigue resistance. 11.1—Introduction. The design procedure includes determining slab thickness based 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. Course Introduction. Fiber reinforcing is very good in restricting the initial shrinkage cracking that occurs in the initial stages. Suite 480 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 Therefore, I am considering a deep slab (200mm / 8") with 1 no. 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. 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. 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). 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. 4 0 obj 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. 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. Fiber reinforced concrete can replace steel mesh in many applications. 10.4—Industrial slabs with post-tensioned reinforcement for structural support. Concrete slab resting on grade containing steel reinforcement which consists of either a welded wire fabric or deformed reinforcing steel bars. 1 0 obj result is a lightly reinforced slab designed to offset the effects of temperature and shrinkage of the concrete. 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. 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. 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]. Basic considerations. endobj We are preparing to pour a 100,000 SF slab on grade which needs to meet mid-level FF/FL ratings. Portions of it are to be polished. 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. 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. Under magnification, it is easy to see that micro-cracks emanating from the aggregate are immediately arrested when they encounter CFS steel-reinforcing fibers. In many domestic and industrial buildings, a thick concrete slab supported on foundations or directly on … ACI 360, "Design of Slabs-on-Grade", refers to this as a Type B slab. Despite these regular efforts, within the thousands of feet of joints, there is still pathogen growth. The Wire Reinforcing Institute recommends the use of the Subgrade Drag Theory for slabs up to 150 feet in length. The use of fiber does not have a major effect on the compressive strength of the concrete. 1-4. stream The slab will definitely crack on the four-square lines but you will have done all you could. k. Reinforced slab. 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. The rebar is suspended in approximately the center of the concrete. The typical construction of a slab requires joints every 12’ 6”, resulting in thousands of feet of joints where bacteria can hide. 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. Concrete floor slabs on grade are subjected to a variety of loads and loading conditions. 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. This CFS 100-2 steel-fiber-reinforced concrete floor has joint spacing of 55 feet and is totally free of visible cracks. <> With no rebar or mesh to set, a floor can be in place faster, saving time and labor. It's usually a good idea to use it, but if you wet cure for a month, it doesn't do a whole lot. %µµµµ However, If you are a PEMB, and the slab is used to resist thrust, then you will still need a way to handle that load. Email: Info, CFS 100-2 Guide Specification for Extended Joint Floors, CFS Joint and Column Treatment Detail Drawing. 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. 3 0 obj Chapter 11—Fiber-reinforced concrete slabs-on-ground. 11.2—Synthetic fiber reinforcement. This paper emphasizes a method to eliminate saw-cut joints in slabs-on-grade by the use of steel fiber reinforced concrete (SFRC) only. Fibermesh ® 150F micro fiber is the optimized balance of the best type of fiber and the number of fibers for resistance to explosive spalling. 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. 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. Remember, area is in square inches while fiber dosage is in cubic yards. 750 West Lake Cook Road Û ”4!fAA0–ØEp"ª$–.Löœˆ:M4J„\ÓȊi“ ³n®­ÿpXñÿ‹›ø¦ÄÂ2ÈÀ”0J¯5&¶Aþâ6’÷rnö6À®¬8"*²7˜©‰enˆ. Sika has developed new software for calculating the amount of SikaFiber® required for slab on grade fiber reinforced concrete (FRC). In ordinary jointed floors, steel fibers provide a safety net by limiting the width of any cracks that occur between the joints. 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. <> And panels should be as nearly square as possible, although an aspect ratio under 1.25 is fine (18/15=1.2). 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. 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 The concrete is then placed into the mold, leaving no space between the ground and the structure. Fiber mesh limits microcracking - it helps prevent cracks from developing during curing. My superintendent has a very strong opinion against using the fiber mesh, saying every slab he's seen installed with it has cracked. 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.

fiber reinforced concrete slab on grade

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