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The design of slabsonground should conform to the recommendations of ACI 360R Refer to ACI 223 for procedures for the design and construction of shrinkage compensating concrete slabsonground The design of suspended floors should conform to requirements of ACI 318 and ACI 4211R
The design of slabsonground should conform to the recommendations of ACI 360R Refer to ACI 223 for procedures for the design and construction of shrinkage compensating concrete slabsonground The design of suspended floors should conform to requirements of ACI 318 and ACI 4211R
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Jan 24 2007 Section 4 is the longest part of ACI 117 covering tolerances for castinplace concrete for buildings including walls floors and slabs The maximum deviation is defined for the plumbness of walls columns and openings Maximum deviation is defined for horizontal and vertical faces
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In hot weather conditions saw cutting may start as soon as four hours after the concrete is poured In cooler weather sawing may not start for 12 hours after pouring The best way to determine whether the slab is ready is to make trial cuts to check for raveling Saw cutting should start as soon as the raveling stops during these trial cuts
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Sometimes concrete cracks before the saw can cut the joint without causing raveling In these cases consider using a lightweight saw that allows you to cut within a few hours after final concrete finishing Using this equipment you can place concrete in the morning then cut the slab during regular working hours the same day
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for concrete floor construction are found in ACI 360R for slabsonground ACI 223R for shrinkagecompensating concrete floors and ACI 4211R and 4212R for suspended floors 52Slabsonground 521 Required design elementsFollowing are the minimum items that should be addressed in
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2 Provide isolation joints between slabs and columns walls and footings and at junctions of driveways with walks curbs or other obstructions 3 Provide contraction joints and joint filling materials as outlined in specifications References 1 Joints in Concrete Construction ACI 2243R American Concrete Institute Farmington Hills MI 2
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Curling is the distortion of a slab into a curved shape by upward or downward bending of the edges The occurrence is primarily due to differences in moisture andor temperature between the top and bottom sur faces of a concrete slab
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If you have a 5 inch slab and multiply it by 24 to 32 you will find that your joints should be placed every 120 to 180 inches or 10 to 15 feet Or another way to figure this out is to times it by 2 or 3 in feet So for example if you take a 6 inch slab times 2 is twelve feet or times 3 is 18
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Slabs crack directly beneath saw cut contraction joints and transfer load between panels by aggregate interlock The tooled contraction joint is too shallow so the concrete created its own parallel joint by cracking This tooled joint was cut too shallow so the crack only followed the joint on the right side of the perpendicular joint
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The depth of your concrete joints should be 25 of the depth of your slab Did you get value from this article Concrete Control Joints Proper Spacing Depth and Timing Explained Share this article and let me know your thoughts in the comments below
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Cracks in Slabs on Ground ASCC Position Statement 29 to occur in 0 to 3 of the floor slab panels formed by sawcutting construction joints or a combination of both The 3 value could be used to cap the crack As published in Concrete International a publication of the American Concrete Institute
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Contraction joints are formed by saw cutting by tooling a joint with a grooving tool or by inserting a plastic strip into the concrete during finishing zipstrip Proper timing and depth of cut are essential If you wait too long the slab will crack where it wants to rather than where you want it to
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Nov 02 2016 Guide to Cutting Relief Joints in Concrete By Brian Fortner Saws Cutting Concrete When placing a new slab making relief cuts in the concrete is crucial to make sure that you dont have unwanted cracks If you are newer to concrete placement this is a key area to understand to make sure that you avoid issues down the road
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Curling of Concrete Slabs What why how Some methods of remedying slab curling include ponding the slab to reduce curl followed by sawing additional contraction joints grinding slab joints where curling has occurred to restore serviceability and injecting a grout to fill voids under the slab in order to restore support and
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Concrete saw cutting overview There are three common types of concrete sawing methods flat sawing wall sawing or hand sawing Flat sawing which is also referred to as slab sawing is the process of cutting the upper portion of concrete to create an even plane up to 24 inches in depth on average This method can level out damaged pavement
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Structural engineers design concrete slabs with posttension cables to obtain greater span lengths between supporting columns and to allow thinner slabs Posttension cables are steel wires inserted into plastic sheathing laid in place while pouring the concrete slab Once the slab cures qualified
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CIP 19 Curling of Concrete Slabs WHAT is Curling Curling is the distortion of a slab into a curved shape by upward or downward bending of the edges The occurrence is
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saw cutting and joint filling Topping slabs bonded or unbonded are outside the scope of this position statement ASCC concrete contractors will work with all parties in addressing these issues If you have any questions contact your ASCC concrete contractor or the ASCC Technical Hotline at 800 3310668 Contraction Joints in Elevated Slabs
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An Engineers Guide to Openings in Concrete Floor Slabs BUILDINGS If you took an advanced concrete design course you probably had a good introduction to the design of twoway gh all multistory buildings require multiple small slab penetrations for routing of plumbing fire protection piping and ductwork between floors
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Placing Finishing Sawing and Curing Total Concrete Slab Packages The following is the second article in a twopart series that reviews current practices for installation of total concrete slab
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Guide for Design and Construction of Concrete Parking Lots ACI 330R01 Concrete parking lots serve many transportation facilities industrial plants commercial developments and multifamily housing projects They are used for storing vehicles and goods and provide maneuvering areas and access for delivery vehicles
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observed with earlyentry sawing was the breakout of some of the concrete around the end of the joint as the saw blade approached the edge of the slab presumably because of the weak PCC and the un supported slab edge Steffes and Siljenberg 2003 An experiment was conducted to evaluate the ef
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Jul 26 2008 i am a concrete contractor and have been asked to form and pour a 6 slab on grade for a municipal project where there will be dumpsters debris and green waste sitting on the slab about 1500sqft the slab is designed with a 4000psi mix
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The requirements for contraction joints CJs in concrete slabs are not directly specified in the commercial base codes and thus can be overlooked by the design professional However the commercial base design codes refer the design professional to ACI guidelines for the requirements of joints in concrete slabs
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Oct 16 2008 How to Control Earlyage Cracking in Concrete Delayed concrete strength gain typically delays the saw cutting of the contraction joints ACI 360R06 Design of Slabs
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Concrete ACI 301M 2016 Metric Specifications for Structural Concrete ACI 3021R 2015 Guide for Concrete Floor and Slab Construction ACI 304R 2000 R 2009 Guide for Measuring Mixing Transporting and Placing Concrete ACI 305R 2010 Guide to Hot Weather Concreting ACI 306R 2016 Guide to Cold Weather Concreting
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The ACI Committee 207 provides several reports for guidance in the use of mass concrete ACI 2071 Guide to Mass Concrete is the primary resource for guidance in the use of mass concrete for structural building elements Most of the data and concerns related to the use of mass concrete were formulated from lessons learned during the United
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ContractionControl Joints Contractioncontrol joints are placed in concrete slabs to control random cracking A fresh concrete mixture is a fluid plastic mass that can be molded into virtually any shape but as the material hardens there is a reduction in volume or shrinkage
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