(Imagine you are walking around the slab) Hit Undo Last to Undo last side. 5% reinforcement (reproduced here as Table 1). Construction joints also have this spacing for strip placement of the concrete. 1 Storey Building: Typically, smaller diameter rebars like 10mm or 12mm might be suitable, depending on the specific design requirements. The fibers must be high quality and tested to verify consistent strength. Steel reinforcement bar size for footing of G+2/ 3rd floor building:- we will assume a structure of G+2 (three storey) residential building, using standard 4″ thick walls, according to general thumb rule, use of mesh bar of 12mm or number 4 (#4) size (diameter) of steel reinforcement as main and distribution bar (T12@6″C/C of Fe500) is most suitable for. 87 d Spacing of bar = Design of Continuous Slab Suppose a slab is supported at the ends and also at intermediate points on beams, the maximum sagging and hogging moments to which the slab is subjected to due to uniformly distributed load, can be computed as follows: Let = intensity of dead load per square metre. 00 m 7 cantilever reinforced concrete beams 18 mm for every 3. Concrete volume calculator plan view diagram. Design of Floor Slabs (fc' = 28 MPa, fy = 276 MPa) Common design parameters: 0. For example, if you must splice between floors 2 and 3 of a building and you do so just above floor 2, then the construction will look like this: Pouring of column from floor 1 to 2 without the splicing rebar (but with protruding rebar awaiting the splice). 4. In concrete slabs, the nominal maximum size should not exceed three-fourths of the minimum clear spacing of reinforcing bars or one-third of the section depth (ACI 302. Fill in the price and single rebar length that you will buy at your supplier: rebar price = €2/m single rebar length = 6 m. . 1 of the 2021 International Building Code (IBC) specifies that the thickness of concrete floor slabs supported directly on the ground shall not be less than 3 1/2″. Figure 5. 9 cm)-round bar 05 = part of second floor plan designated by the number 5. SLAB—Flat section of floor or roof either on the ground or supported by beams or walls. In two-way construction,According to Clauses 8. ** For alternate steel schedules and/or slab thickness determine As (end area of steel, in2) as shown below and use USDA NRCS Standard Drawing ES-46 to select bar size = and spacing that meets or exceeds the computed end area of steel. The formula is, Number of bars = (length ÷ spacing) + 1. t 12mm stirrups at 150mm ctrs Two terminated bars A A Elevation Section A-A Lsy. Rebar is steel rods that typically run through slabs of concrete. 7. 1 in2. The typical depth for rebar placement for slabs is 2-4 inches. The minimum spacing between two reinforcement bars should be at least equal to the maximum coarse aggregate dimension plus a margin of 5 mm. 1 -The no. There are many variables that influence the decision of how much space to leave, including the maximum load the slab is likely to have to support, the bearing capacity of the soil, the diameter of the reinforcing rebar, the likelihood of frost heaving the. Annex. Our calculator will instantly calculate the quantity of rebar required. These cracks have little impact on durability. If the slab in question is just for a patio or a similar purpose, #3 rebar with a diameter of 3/8-inch will do just fine. rt i 2nd layer walij-dwls longit #4@ 12" ole 11'9 "t_ "-1)_-item qty part or no. It’s not necessarily the placement of the rebar in the slab but the amount of rebar/rebar spacing and the depth of the slab. 02 To control deflection, r. Sub-slab details (i. 50 m span joist, beams, & girder soffit under 3. Slab Design Rules - General. rebar spacing o. Retaining Walls: The most commonly used rebars in retaining walls are #3, #4 and #5. of the most advantageous location for a floor opening depends on the type of two-way slab you’re designing or evaluating. Consider. x 18 in. 1R and 421. 3. #Lonbicooltv Using the search function should turn up a lot of info. Two-story buildings require a minimum of 15-inch wide footings for 1,500 LBV soil. If the slab is more than 24 inches thick, #5 (#5/8 inch diameter) rebar may be required. Thank ForSubscribeLikesShare. Normally, it is assumed changes in deck slabs, and sloped slabs over beams. For single layer rebar, the design uses the top bar size, and spacing options. 15 mm) polyethylene vapor retarder with joints lapped not less than 6 inches (152 mm) shall be placed between the base course or subgrade and the concrete. Much of the time, the depth that finishers install control joints is less than what is normally recommended. I have reinforced composite slabs 3 ways: all mesh (my least favorite), all #3 bars, or mesh w/ rebar over the beams only for slab negative reinforcement. Also note while no. ACI 330R-08, Guide for the Design and Construction of Concrete Parking Lots is. 59 per square foot. Concrete doesn't dry out; it undergoes a chemical curing process that creates a dry, solid mass. Concrete is cast on top to a depth of about 3 inches over the top of the forms, encasing the rebar in the beam pockets and the mesh. 4 bar at the top and the bottom of the footing or one No. The result is a lightly reinforced slab designed to offset the effects of temperature and shrinkage of the concrete. Subject: Re: Rebar in shop floor? Kingston,Mi. However, no matter how basic or complex. 8. As per the present market rates, the average cost of concrete for a 400-square foot slab, the typical size for a two-car garage, ranges between $583 and $637 or between $1. The bracing comes out after curing. Minimum tensile strength of concrete: 4,000 PSI. In general, 6 inch (150mm) slab thickness is considered for residential and commercial buildings with reinforcement details as per design. #3 is most commonly used for patios and driveways, #4 for columns and walls, and #5 for foundations and footers. All floor elements were brought in as DECK elements. If the floor is designed as a reinforced-concrete slab requiring rebar in the tension zone, the designer should specify the correct rebar position. In that case, a layer of rebar near the bottom or at. 3. 2. 9 m in buildings with light wood-frame walls, floors and roofs, footing widths shall be determined according to. For example in a slab of 6-inch depth, a rebar of 6/8 inch will be used. 9 Factored loads Factored dead load = 3. 🕑 Reading time: 1 minuteEstimation of steel reinforcement quantity for concrete slab, footing and column, beams etc. FLOOR SLABS M. SLAB REINFORCEMENT SIZE REINFORCEMENT SPACING ANCHOR ANCHOR Cutting that rebar ain’t going to do shit, despite all the “engineers” comments to the contrary. Many concrete slabs for homes, driveways, garages, and sidewalks are built according to standard thickness recommendations and do not require a specific. x 27 in. ˘ ˘ˇ Spacing (Rebar) A-7 4-1/2” 4000 psi with 28 day aging #6 rebar 12 in. If your concrete will be stamped, ask about the best ways to avoid interrupting the pattern. Clear span of the two way slab = 5000 mm. 2. 21 m 2. Reading time: 4 minutes. The most commonly used rebar sizes for slabs up to six inches thick are #5 and #4. For live loads of about 50 psf (2. The type of rebar used in the construction of a given section of concrete will depend on several. The more layers of rebar you have, the harder it becomes to properly vibrate the concrete. 6 Pedestrian Circulation--Stairs and. These slabs are supported directly by the columns and have a completely flat soffit. Important Points. vided in the slab under the net. The Rebar Calculator contains equations and data used in working with reinforcement bars (rebar) in concrete slabs. 6 of the International Building Code. Types of Slab Construction ACI 360. 20mm clear cover is sufficient for intermediate floor slabs, and 30mm clear cover should be provided for roof slab exposed to rain (c). The steel rods help reinforce the strength of the concrete slabs giving the structure a strong form. #5 bars are 5/8”. or >) The minimum floor thickness shall be 6 inches. 73 per square foot for concrete installation. Unless you are going to park a very large truck on the slab the 2'x2' oc #4 rebar is over kill IMHO. 1: Calculate The Main bars. spacing requirements and to repeat bar size and spacing as often as possible. For example, if the first slab is at 12 inches and the second is spaced at 18 inches then measure and place your first mark at 9 inches and then continue spacing the marks at. 7736 m 2. 2. I have an exiting two way concrete slab in which it is required to introduce new openings. For example in a slab of 6-inch depth, a rebar of 6/8 inch will be used. Slab depths are typically between 4”-10” (10. that is 2. Steel reinforcement bar size for footing of G+1/ 2nd floor building:- we will assume a structure of G+1 (two storey) residential building, using standard 4″ thick walls, according to general thumb rule, use of mesh bar of 12mm or number 4 (#4) size (diameter) of steel reinforcement as main and distribution bar (T12@6″C/C of Fe500) is most. c. The design of one-way slab is simple and can be carried out easily. They are used to support the concrete, which would move and break if set against soil alone. The distribution bars are installed in the slab’s top layer, with a minimal cover distance of 15mm from the slab’s top. Foundation and floor slabs for buildings located on expansive soils shall be designed in accordance with Section 1808. However, for post-tensioned (PT) slabs, this can be mistakenly regarded as difficult, expensive, and. It has Spanish language descriptions, labels and diagrams and it also has default units in the metric system (SI). SLAB ON GROUND—A type of foundation with a concrete floor which is placed directly on the soil. 8 ). But if one should choose to reinforce their concrete patio, the reinforcement bar they should use should be a size #3, which is 3/8 in diameter. ) = 0. Suspended slab/Two-way slab/One-way slabToday's video answers the questions I get asked most frequently: - How do you read or interpret slab reinforcement pl. A good GPR survey and interpretation should give you the rebar spacing and pattern. Because our accuracy while scanning with GPR is so high, we. Rebar. 1 For longerfloor slab rebar' • ~ #4 19 mk402 "rll ~ ii i i i i i i i i i i i i i i i i i i i k '&y ih:' ii~. Rebar is recommended on concrete measuring 5 – 6 inches thick. Contractors sometimes use the “1/8 Rule,” meaning the size of the rebar is 1/8 the thickness of the. The main reinforcement of the slab panel “A” is marked as (1). This wood sheeting, which should also be stronger than average, will act as a subfloor. Place these positioners at a spacing that will not allow the rebar to bend or deflect enough to reduce the coverage you wish to obtain with the concrete you place in you forms. #5 rebar on a 6X6 grid, No cracks in that, poured the same time as the slab in the heated addition. Minimum and Maximum Spacing between the Main and Secondary Steel Bars in Slab ISpacing of Steel bars. Crack Control – when crack widths are not checked by calculations No Further Checked Required. 125mm. The two design options are a ground-bearing slab, or a pile supported suspended slab. (5) Concrete foundation stem walls that are formed by a thickened concrete slab edge as part of a slab on grade floor must be reinforced with one piece of No. 1. Sunitha K Nayar, gives the grouping of slabs-on-grade based on the design philosophies and a brief overview of the different design methods, the commonalities between design strategies in terms of the input parameters, assumed and estimated parameters, and the relevance of each. These new concrete slabs do not account for second floor installations or installations in a ground floor with a basement beneath. Prepare and Place Reinforcement for Slab. 3. In a typical reinforced concrete building, reinforcement bars arranged as mats are incorporated into a concrete plate of minimum thickness 125 mm to form a reinforced concrete solid slab. The top surface needs to remain wet while the curing process takes place. 34 and $7. Typically, once the concrete in the foundation wall has set, install the floor system. Type and spacing of the control and construction joints. 73 Therefore, use 12 mm bars @ 0. Advertise Here. It covers the principles, methods and best practices for various types of composite structures, including simply supported, continuous and cantilevered beams, and slabs with different decking profiles. bars at each corner 38mm clear 400 slab opening omit trimmer bars where typ. , and unfactored live load = 100 psf. 6. This new slab design does not account for second floor installations or installations in a ground floor with a basement beneath. , where a T-beam girder is supporting T-beams that in turn are supporting slabs, as shown in Figure 8. (1) ε = θ (h b + h s) L-L 1. Learn the steps to pour a concrete floor inside an existing garage, house or shed. 00 m 7 cantilever reinforced concrete beams 18 mm for every 3. 34 and $7. 1. and the clear spacing between the bottom bars a = 60 mm. FIrst, find number of rods required for main reinforcement and distribution. If the concrete slab in question is meant to be the footing of a house, then #5 rebar with a. Epoxy coated rebar. It follows that the design yield strength of reinforcing steel that may be used in a slab designed in accordance with AS 3600-2000 is 400, 450 or 500 MPa. 42d. Input all the dimensions in the input section of the above calculator. In either case, blocks should be used under the reinforcement to keep centered within the concrete. AS3600-2009 P P Lsy. vapor retarders - some times referred to as vapor barriers, insulation, etc. . Provide the required spacing and diameter of the rebar. This calculator finds rebar sizes and spacing for beams, girders, and 1-way slabs for a particular type of reinforced concrete floor system consisting of a regular grid of columns supporting a hierarchical. 2130605 2 = second floor B = beam member 06 = 6/8- or 3/4-inch (1. 2. c. My understanding of slabs based on limited experience and a heck of a lot of reading here is:1. 15 1-1 CHAPTER 1 INTRODUCTION 1-1. 3) Shrinkage cracks: As the concrete slab dries after placement, it shrinks. 23 Total factored load = 6. Steel fibers, at 1. for early-entry sawed joints. For the trapezoidal, dovetail, and reentrant composite slabs, and RC slab, welded rebar meshes with Φ 8 ribbed bars were selected, and bar spacing was 200 mm in both directions. com Round Measurements To Running Bar Points (Length - Left to Right): Running Bar Points (Width - Top to Bottom): Calculate Rebar Quantity From Total Slab Area and Perimeter To calculate Total Area of a multi sided slab, first divide the shape into rectangles or squares. . 83-6. . Specify the spacings: rebar-rebar spacing = 40 cm, edge-grid spacing = 8 cm. For slabs (i) The maximum spacing between two parallel main reinforcing bars shall be 3dor 300mm or whichever is less, and (ii) The maximum spacing between two. 1) describes six common types of floor slab con-s t r uction. The 4″ slabs-on-grade are placed on a layer of. Generally, #4 rebar (1/2 inch in diameter) is the most common size used for slab on grade applications. C. CONTROL JOINT SPACING. DETAILING OF SLABS (For class held on 6th March 07) By Dr. To assign a Slab element to the floor, go to Assign>Wall/Slab/Deck sections. However, this is the absolute minimum and applies only when there is no load on the concrete slab at all. Minimum clear cover to reinforcements in slab depends on the. Fo r decades ACI 318 has re q u i r ed high-Concrete slab-on-ground floors shall be designed and constructed in accordance with the provisions of ACI 332 and this section. The structural design of the concrete floor slab on-ground is dominated by the sub-grade conditions and the floor loadings. ) 400 dowel 400 250 %$56 $6 6+2:1 %277 %$56 # 2 & slab occurs mid-depth of slab [ /21* $7 723 bott. Often it is necessary to cut holes in concrete floor slabs. The slab will be 3" thick with 2. Maximum spacing of bars for slabs • Main bars: 3h ≤ 400mm (in areas of concentrated loads 2h ≤ 250mm) • Secondary bars: 3. Except for Type F slabs, all slabs are expected to remain essentially uncracked under applied loads. Section 13. 3. Wire mesh is better then rebar, if it can be kept up off the bottom of the slab. b) Slab depth does not exceed 200 mm when the steel grade is 460. #construction #Philippines #staircase #stair #stairs #stairsPhilippines#steelbar #rebar #stairrebarRebar details for stairs and slab ThicknessAmerican Concrete Institute—there's not much available free from ACI, but if you want the best information on concrete and concrete parking lots, ACI has it. . FIrst, find number of rods required for main reinforcement and distribution. You can use regular fencing material with 2' x 4' or 2' x 6' mesh. most of the time). , F. 10. Compressible floor-covering materials that compress more than 1 / 32 inch (0. The term "composite steel deck floor slab" is applied to systems in which the steel deck has some mechanical means of providing positive interlocking between the deck and the concrete. 8 ). One reason is simple ease of construction. 25 inches (13 to 56 mm) in length. Pour 6" fiber reinforced concrete over it. 2 mm) in thickness in the uncompressed state shall not extend beneath walls, partitions or columns, which are fastened to the floor. • A beam-and-slab system, with a one-way slab, and beams cast compositely with the slab, is a highly efficient floor system. Larger diameter bar will allow a wider spacing of the bar, our designs went from 3/8 on 12 inches to 1/2 on 18 inch when we started to build pesticide storage facility's. 1 shows the design detail for a secondary containment floor slab with two layers of reinforcing. 27. spacing requirements and to repeat bar size and spacing as often as possible. If the concrete slab in question is meant to be the footing of a house, then #5 rebar with a. By: Olin Wade (Remodel or Move Stuff) The spacing of rebar in a slab depends on the purpose and size of the slab, as well as the climate in which it is being built. slab along the shorter span, 3mm per meter span. Common Rebar Sizes. Tie the rebar together. Here:Bar Tying Requirements. For general purpose concrete slabs with 2,500 pounds compression strength, like patios, use a 1:2:4 concrete mix ratio. The pri m a r y differe n c e s b e t w een each type are re i n f o rc e m e n t details and joint spacing. Step 2 - Prepare the Floor. , interior beam dimensions = 14 in. The elevation to the top of the decking (bottom of the concrete waffle slab) for forming of the second floor above-grade slab is ___. The suspended reinforced concrete slab is tied into the external capping beam. Floors shall be a minimum 3 1 / 2 inches (89 mm) thick (for expansive soils, see Section R403. For a 400 square foot slab, the man hours required to finish a two-car concrete garage slab is about 13 hours. Guidance for joint spacing to minimize out-of-joint cracking for such slabs. Rebar is typically used to provide additional strength and rigidity to concrete slabs, so if the slab is intended. The numbers range from #3 (smallest) to #18 (largest). If the slab is poured against an existing foundation wall or another slab, you would use the #4 or #5 rebar to dowel it to the which ever you are butting too. and 6000 btu/hr heat loss in the second. The second marker expresses the bar size and is demonstrated by a number. However, in some cases, 10mm dia bars are taken for the floor slab, when there is no extra external load other than reinforcement mesh load. Use 3/8 min repair frame in the footing. Figure 1a: Joint Spacing in Meters. Reinforcing steel should be properly tied with wire to rigidly support it in its proper. )(100)/(6 in. Design beams B1, B2, B3, B4, and B5. Rebar Development Length Calculator is a web application that supports the design of post-installed rebar in concrete applications by calculating the necessary tension and compression development lengths required in accordance with ACI 318-19 / ACI 318-14. of main bars – One = [Lx ÷ bar. When arranging joints, skilled contractors will often use them to create an attractive diamond pattern. Concrete Slab Rebar Spacing Guideline Report an Issue. The main bars are usually positioned in the slab’s bottom layer, with a minimum cover distance of 20mm from the slab’s bottom. In t e r p r etations of the ACI 318 code re q u i r ements (Ref. 3%. . How far apart should rebar be spaced? approximately 12 inches Place rebar in a grid pattern with a spacing between bars of approximately 12 inches. However, we want to use slabs for the floor elements in this model. 2L at the intermediate support. You cut as 4,000mm +760mm = 4,760mm. This guide identifies the various classes of floors based on use, construction design details, necessary site preparation, concrete type, and other related materials. 1 L from the center of the support at end support and 0. The height of the slab bolster is determined by the required concrete protective cover. This article presents steel quantity computation process for slabs, columns, and footings. For this case, the lift should not be installed without written authorization from theSlab Reinforcement Two-way slabs are generally defined as suspended slabs whose ratio of long span to short span (bay length to width ratio) is less than two. Use f’c = 28 MPa and fy = 414 MPa for main rebars and fy = 276 MPa for shear reinforcement. If you want, you can cut out of a section of the steel for testing too. 2 – Contraction joints, states the following: “ (d) Joint depth shall be a minimum of ¼ the slab thickness for formed or tooled joints, or dry-cut sawed joints in hardened concrete (e) Joint depth shall be a minimum of 1 in. There are three different sizes of rebar typically used for home construction projects. The conditions are commonly related to reinforcement ratio, size of rebars, spacing of steel bars, size and spacing of lateral ties or spirals, thickness of concrete […]3. Ordinarily, the rebar supplier details, fabricates, and delivers to the site, as required. Total Length of rebar in feet. You'd really need to know how much steel was in it to get solid data. 78 kg/m 3) in accordance with the manufacturer’s recommendations. t + DWhen a concrete slab is stressed by the post-tensioning method, it means the steel is being tensioned and the concrete is being compressed. 3 bars may be used, for constructability and handling reasons it is common practice to use no. In the case of the RCC slab, the maximum spacing between the two parallel main reinforcement bars should be 3D or 300 mm or whatever. 5-3 Dowel size and spacing. But as the depth grows, so does the need for reinforcing the structure. 2 consists of a 3-inch-thick reinforced concrete slab supported by steel beams. 74 equals 1824 lbs per sq feet. The diameter of reinforcing bars shall not exceed one-eighth of the total thickness of the slab. The minimum column size should not be less than 9 "x9". The rebar used for swimming pool construction is grade 40 deformed bars conforming to the standard of ASTM A615. Larger areas, lower loads, and higher seismic zones. 00 m shorter span one-way floor slabs under 3. The basic building block of this application is further known as a composite floor slab. Floor Under Solids or Semi- solids and Single Axle load (15,000 lbs. 7Foundation and floor slabs for buildings located on expansive soils shall be designed in accordance with Section 1805. The compaction UNDER the slab is more important than the thickness of the slab. We would like to show you a description here but the site won’t allow us. For footings that are poured before the slab, two #4 horizontal pieces of rebar are required – one 3” from the top and the other 3” from the bottom. 20 Plant-applied External Fusion Bond Epoxy Coating [Abrasion-Resistant Overcoat] for Steel Pipe (CSA Group, formerly the Canadian Standards1) Except as provided in Sentences (2) and (3) and in Articles 9. The depth of slab needs to be increased if slab panel size (b) increases, but rebar requirement remains the same for slab (refer to point 3). Dosage amounts shall be from 0. south d c rebar i 306" i #7,7/8" dia ---j r--rebar j. is crucial for the cost evaluation for the construction. Tendons today are seven high-strength steel wires wound together and placed inside a plastic duct. The load needs, and the span of the slab decide the spacing, size, and placement of the bars. Reinforced concrete (R. 2. ( W) Width of the slab. 3. 00 m to 6. 40 (default) and 60 are common. Two-Way Concrete Floor Slab with Beams Design and Detailing Design the slab system shown in Figure 1 for an intermediate floor where the story height = 12 ft, column cross-sectional dimensions = 18 in. If the floor is. Contractors sometimes use the “1/8 Rule,” meaning the size of the rebar is 1/8 the thickness of the slab. 1. Whether the frame is precast, cast-in-place, masonry, or structural steel it can be accompanied by a HollowCore floor slab system. 2. The spacing of the rebar is also determined by the weight and size of the slab. MINIMUM VERTICAL REINFORCEMENT AND SPACING (INCHES) b, c: Soil classes and later soil load d (psf per foot below grade) GW, GP, SW and SP soils 30: GM, GC, SM, SM-SC and ML soils 45:Concrete Floor Slabs On Grade Course# ST-702 EZ-pdh. See full list on everything-about-concrete. For corrosion protection, however, most specifications require a minimum depth of concrete cover that usually ranges from 1 inch to 2 inches. Slab may be supported on walls or beams or columns. 5/16" 2" long bolts thru tight holes spaced 3" apart at the outer ends and then increasespacing by 1/2. . Generally, you do not need rebar for a 4-inch slab. 15 feet x 12 inches per foot = 180 inches. This configuration directs load transfer predominantly in a single direction toward the columns. Multiple layers of c r ossing bars cause these pro b - l e m s . , S. , edge beam dimensions = 14 in. Selecting the correct type of rebar is as impor tant as the diamet er and grade. Divide your result by the spacing measurement: 180 in / 14 in = 12. 3. Therefore net area of slab = 201. If two or more courts are constru c t e d , expansion joints should be prov i d e d midway between court s. 9. Average: Rebar in Concrete Slab Estimator. Scanning and Detecting Rebar in Concrete. reinforcement for the bottom fibers of the composite slab. Expansion grooves should be cut into the wet concrete to provide additional crack resistance. Rebar being #4 grade 60. The Rebar Calculator is now available in Spanish. Basement slabs and interior slabs on grade, except garage floor slabs 2,500 2,500 2,500a Basement wallsc, foundation walls, exterior walls and other vertical concrete surfaces exposed to the weather 2,500 3,000b 3,000b Driveways, curbs, walks, patios, porches, carport slabs, steps and other flatwork exposed to the weather, and garage floor slabsThe Rebar Calculator is now available in Spanish. some different types of rebar affect not only the str ength but also the longevity and durability of concrete structures. Avoid using air contents over 3% for interior slabs. In the farwestern states, the rebar supplier also ordinarily places the bars, In the New York City area,…. Then use USDA NRCS. Rebar comes in several types: Steel mesh, made up of steel wires that provide support to the concrete. E discuss natin dito ang Lapping Zone, Lapping length, Stag. 5 bars; There shall be a minimum clearance between parallel reinforcement bars of 2 1/2 inches; Bars larger then # 5 increase the chances of shadowing (voids behind rebar) Always use the larger of the two. 2ND FLOOR CRACKING WIDTH. 5. 1R). 00 m to 6. Second, in cases where a T-beam is oriented so that it is parallel to the main slab reinforcement (e. 00 m to 6. How thick should rebar be? Common Rebar Sizes Rebar in patios, basement floors, footings and driveways may vary from size 3 to 6. ACI 318-11. Heavy Loads. The edge of the slab is usually thicker and acts as the footing for the walls. For corrosion protection, however, most specifications require a minimum depth of concrete cover that usually ranges from 1 inch to 2 inches. 3 -SPACING OF TRANSVERSE REINFORCEMENT 11. If you want to combine rods of two diameters, there would. /18 in. Secondly, the type and diameter of steel bar used for a concrete slab’s rebar depends on the design specifications’ load-bearing capacity. Free Reinforcement Calculator. Low-carbon st eel is mostly iron and ferrit e with 0. 25" 3,000 PSI / 28 Day Aging #6 Rebar: 12 in: D2-10 Models: 4. The lengths are in meters and centimeters, the areas are in square meters, the volumes are in cubic meters, and the weights are in kilograms and metric tons. For columns and beams, the minimum spacing should be 6 inches. Carbon steel. The compaction UNDER the slab is more important than the thickness of the slab. girder sides & slab on grade - 1 reinforced concrete beams 6 mm for every 4. I have 10 in. extension of existing reinforced concrete (R/C) structural elements such as slabs, walls, and columns (Figure 3), either to facilitate expansion of floor space or to address other functional changes in the use of the structure. Five to six inches is recommended if the concrete will receive occasional heavy loads, such as motor homes or garbage. 1. The typical depth for rebar placement for slabs is 2-4 inches. The thickened concrete slab.