See full list on inchcalculator. pmax=CwCc [150+9000R/T] for walls with a rate of placement of. The resulting one-way structural system has a T-section. ( rS) Rebar Size (2,3,4,5,6,7,8,9,10,11,12,14,16,18,20) Use Size "0" for. It requires careful attention to detail and an understanding of the various. 0. Building Supply Stores; Online Retailers; Wholesale Distributors. " Multiply the measurements from Step 1 and Step 2 together. 2-inch slab; 2-inch chairs for a 4-inch slab; 21⁄ 2- i n c h chairs for a 41⁄ 2-inch slab and 3-inch chairs for a 5-inch slab. 9_sqrt (0. 2], even though the code permits. For Beam = 2 % concrete volume. The total quantity of steel required in the given slab is 565. 125 - 0. the calculator will give you the default spacing values (for rebar – rebar it’s 40cm, and for edge – grid it’s 8cm). Steel- reinforced slabs, typically between 100 and 500 mm thick, are most often used to construct floors and ceilings, while thinner mud slabs. Fire design of cast-in place and post-installed anchors in concrete under fire is covered by EN 1992-4, Annex D, allowing steel- and concrete-related failure modes of anchors to be calculated. Next, find the coverage of the roll. 5" Rebar Chair (911) 3" Rebar Chair (912) 2-Bar Footer Stand (928) 3-Bar Footer Stand (924) 2" Steel Mesh Chair (944) Find It Quick. To use our rebar calculator, simply input the dimensions and specifications of your project. A: A rebar spacer is a piece of concrete block (usually 25 to 50mm cube or 50mm dia cylindrical) intended to provide spacing between the outer surface of the finished concrete and the reinforcement inside. coverage = 250 sq ft. 4. The weight of a concrete slab can be estimated by computing the volume of the slab and multiplying the volume (V) by the density of the concrete. 35* (bw*s/fyt) Equation 5. Input length, width and depth of the area. Tensile stress is a force exerted on an object that lengthens or stretches that object. Imposed loads varies from approximately 1. Feet. Rebar Development Length Calculator. The formula is in feet and is L x W x H (/27). 2. As an example, using a relatively simple two-story steel-frame office building as a model, the work phases might include Mobilization, Foundations, Elevator Pit, Slab On Grade, Brace Frame Closures, Slab On Deck, Pan Filled Stairs, and General. Factors such as slab size, thickness, reinforcements, and type of finish can affect the overall cost. 3—Steel fiber reinforcement Chapter 12—Structural slabs-on-ground supporting building code loads, p. For RCC Roads, 0. 3 cubic feet of concrete for this slab. When reinforcement bars of different sizes are bundled as compression bars, the lap length chosen must be larger of the following cases: Compression splice length of the least diameter bar or. The Rebar in a Circular Shaped Slab calculator estimates the total length and weight of reinforcement bars (rebar) needed for a circular shaped concrete slab. With this calculator, you’re trying to calculate the dimensions of your rebar grid (length and width). Enjoy the Rebar Calculator for Slab. Length of bar = L or W–concrete cover for both. Concrete Slab Volume Estimator Calculator Estimate the require concrete volume to fill the width, height and depth given. The Rebar Calculator contains equations and data used in working with reinforcement bars (rebar) in concrete slabs. The Rebar and Concrete in a Slab calculator computes the total length and weight of rebar and the volume of concrete needed for a slab. It also checks for minimum steel for crack control as well as steel for balanced section. Select the unit of dimension like meter, feet inch, etc. Required fields are marked. 0 % of concrete volume. Determine the rebar gauge. 2 kg. Commonly called “rebar,” these 1/2-inch-diameter steel rods are embedded in the center of the slab to create a grid that extends lengthwise and crosswise to help the concrete better resist pulling and bending forces. The Concrete Weight formula computes the weight of a volume (V) of concrete. Calculate volume of concrete i. 3. First, you must determine the width and length of. On average are required, for 10 square meter with 12cm thick slab, 19 strips of 3/8” rods (9ml each one), are 171 ml. ACI 347-04 "Guide to Formwork for Concrete" lists three modified hydrostatic pressure equations: pmax=CwCc [150+9000R/T] for columns. Equate the balanced moment of resistance to the maximum bending moment; Find the effective depth ‘d’. Minimum dimensions and axis distances for reinforced concrete slabs. 5 feet = 49. Reinforced Concrete Beam Design per. By: Olin Wade (Remodel or Move Stuff) Calculating the amount of rebar needed for a concrete slab involves many steps. Estimation of steel reinforcement quantity is a necessary step in calculating cost of RCC structure along with other building materials as per. I am looking for information to calculate what is my required dowel rebar size and embedment length to dowel into a reinforced concrete slab? I know ACI has provisions for doweling a concrete column/pedestal into a footing, but I am trying to find something regarding doweling CMU rebar into a concrete slab. The current design codes discuss the effective compressive strengths of columns, which reflect a decrease in load transfer performance that can occur when columns and slabs have different concrete compressive strengths. Find a Spot and Make a Frame. For example, if the percentage is 0. First, enter the concrete slab sizes: length = 6 m, width = 4 m. The experimental program was designed to evaluate how flexural performance at service and ultimate limit states are affected by a one-to-one replacement of Grade 60 with CRR bars, a reduction of concrete clear cover, and a reduction in rebarThe use of the rebar bar in construction extends up to the 15 century for masonry structures. Slabs, Square Footings & Walls. On average, a 60-pound bag of concrete covers about 0. 2. They seem to have that. 85Vc > Vu. 9_sqrt (0. 25 per linear foot, and prices increase up to $9. You’ll find that #3, #4, and #5 size rebar is most commonly found in home reno stores and used in footings for homes and other domestic structures. 05 percent of steel ireinforced concrete pavement, and the minimun m directions normal to each other for a distance of 3 allowable length of the slabs. The main standard for fiberFor λ = 1. 56. The rebar is built in a grid structure and costs $2 to $3 per square foot. Step 4: Place all of the step-up rebar you’ll. Determine the rebar gauge. 9. This concrete calculator also calculates cubic meters. splices) or global compression struts to avoid brittle. 1 meter = 3. Assume your longitude is 15 feet and there will be 14 inches between latitude rebar. 4 wire mesh in a 4-inch slab, P = 8. Here’s what you’ll need to do before you pour any concrete: 1. of Main bars = 20 + 1 = 21 Nos. #3 rebar is ⅜” in diameter, #4 is ½” in diameter, and so on. epoxy-coated reinforcing steel was compared to deck slab specimens where Grade 60 is replaced with CRR bars. Strength. g. Concrete Calculator Efficiently calculate the weight of rebar for your construction projects with our handy rebar weight calculator. (150 to 250 mm). Click the button to calculate the volume of concrete and man-hours (not including mixing) needed for this job. For each additional 20 foot increase of the wall. For flat slabs, grid spacing of 18 inches for driveways and 24 inches for patios is recommended. Once this is complete, you will need to add the steel reinforcement bars (or similar) by clicking the "Add/Edit Steel Reinforcement. This is the formula: mesh needed = slab area ÷ mesh area. 15 m) Farm building floors, Home basement floors : 4 inches (0. Concrete slabs that will hold a heavy load or be built on soil in poor condition could require steel rebar reinforcements. NOTE: this calculator was updated on 16 Feb 2022 to accommodate the inset of rebar placement from the edge of the slab. Concrete and rebar must be used for every four feet of the foundation wall. 2 CY for Site B when taken to the tenth of a cubic yard (0. INSTRUCTIONS:. The plate is 24 cm thick and is supported by 45/45/300 cm columns at distances of 6. SOLVED EXAMPLE FOR ANCHORAGE LENGTH Calculate the design tension anchorage length of X16mm bar (f yk = 460 N/mm 2,. area = 625 sq ft. Step 1: – Calculate numbers of distribution rods. Convert between weight and volume measurements used with concrete. 4. Multiply the length (10 ft. 1. In order to simplify the analysis and to be able to use the superposition principle for evaluating the effect of load combinations, linear analysis is generally adopted even though concrete slabs normally have a pronounced non-linear response. Rebar rod length of 6 m. You will need 158. 1—Introduction In flat-plate floors, slab-column connections are subjected to high shear stresses produced by the transfer of the internal forces between the columns an d the slabs. Most concrete slabs are cast monolithically with supporting beams, with portions of the slab participating in flexural resistance of the beams. 12 ft). 2: Repeat and continue to draw complete (closed) shape. For example, if the length is 10 feet and the width is 8 feet, the area would be 10 x 8 = 80 square feet. 1. To find the Bar Bending Schedule for Slab we use the following formula, No. Sq. If your footings are 16 inches thick, multiply 16 by 80. Fa b r ic may also be supported at the center of the slab, or it may be installed in two flat layers with the top layer (nega-t i v e steel) extending on either side of the support for one-quarter of theSteps to Calculate Steel Quantity · Enter the Length and Width of your slab in ft in Excel Sheet. Running Bar Points (Length - Left to Right): Running Bar Points (Width - Top to Bottom): Calculate Rebar Quantity and Mesh From Total Slab Area and Perimeter. The Weight of a Slab with Rebar calculator estimates the weight of a rectangular slab including rebar (if used). 11. 78. If you’re wondering how many bar chairs you need per m2 for a sheet of mesh, generally, a minimum of 22 bar chairs per sheet of 6m x 2. As such, I would do one of two things: 1) Effectively lap the rebar with the rebar in the elements above and below. g. The latest round of changes concentrates heavily on responding to developments in materials, structural systems and seismic design. = 7. The calculation is very easy for circular areas. The online Concrete Rebar calculations assists civil engineers how much Rebar for a concrete slab required. Enter the slab dimensions, desired rebar spacing and the spacing from the edge to quickly find how to lay out the rebar grid. This way, the concrete doesn’t receive as much stress . Ft. Lets take example of RCC Column, where reinforcement required is 2. User notes: About this chapter: Chapter 19 provides minimum accepted practices for the design and construction of buildings and structural components using concrete—both plain and reinforced. Next, divide the total square footage by the size of the rebar. 1 For longerHow do you calculate percentage of steel in concrete? Calculate the percentage of reinforcement with the formula P = 8. 85Vc > Vu. To calculate Total Area of a multi sided slab, first divide the shape into rectangles or squares. 8 kg . The Rebar in a Circular Shaped Slab calculator estimates the total length and weight of reinforcement bars (rebar) needed for a circular shaped concrete slab. A concrete slab is versatile and durable that can be used in a wide variety of applications, including driveways and patios. 4. 0, 8 λ (ρ w) 1/3 becomes equal to the value 2 λ for a longitudinal reinforcement ratio ρ w = 1. This study presents structural performance of large scale two-way concrete slabs reinforced with FRP rebars, and their performances were compared against conventional steel reinforced. 062*fc'(0. In the two-way slab, the same practice as mentioned above should be followed for both directions. How do you calculate rebar spacing? Find the rebar-to-spacing multiplier with the formula M = 0. Calculate Rebar Quantity From Total Slab Area and Perimeter. Shuttering costs are taken as 15-18% of the total construction. Chapter 19 relies primarily on the reference to American Concrete Institute (ACI) 318, Building Code Requirements for Structural Concrete. If your wall is over 20 feet long it will add the amount of overlap required. Columns that support flat plate slabs and columns that are supported by footings are the most common examples. When the dimensions of a slab, wall or other form exceed the length of a single stick of rebar, it is required to overlap and tie rebar pieces to create the added length. Reinforcing the slab with wire mesh or rebar can increase its strength, but it comes at an additional cost. Number of cubic yards = 64 cubic feet ÷ 27. Concrete slabs thinner than 4” typically don’t need rebar. 2 kg. NOTE: this calculator was updated on 16 Feb 2022 to accommodate the inset of rebar placement from the edge of the slab. in contact lapping case, one side of the rebar is covered by the other rebar. INSTRUCTIONS: Choose units and enter the following: (L) Any Length of Rebar(S) Rebar Size (2-11,14,18) Volume of Rebar (V): The calculator returns the volume (V) in cubic yards. Calculate rebar length for the slab — RL — using the formula: RL = SL – 0. Click the button to calculate the volume of concrete and man-hours (not including mixing) needed for this job. Where; A c is the area of the cross. It is used mostly in a combination of these two in concrete slabs. R9. When you swing on a rope swing and jump into a swimming hole, you exert tensile stress on the rope. In this topic, we find how to calculate Rebar for your project, so you can protect your assets. Cost of Rebar: Provides the cost of rebar on a project. Calculate the amount of Rebar needed for reinforcing a wall. Divide your result by the spacing measurement: 180 in / 14 in = 12. ) by the width (10 ft. You should start by placing your rebar a foot away from the sides of the space. g. 2—Synthetic fiber reinforcement 11. Report Application Issues or. 2. Once you input these values, you. The amount of rebar needed for a slab will depend on the size of the slab and the particular requirements of the project. Concrete is sold in cubic yards (27 square feet), so you will need to multiply your square footage from Step 1 by the depth of. The first step is to determine how much rebar is required to support your foundation. The weight of a concrete slab can be estimated by computing the volume of the slab and multiplying the volume (V) by the density of the concrete. (as in example diagram) Multiply the 2 different side lengths of each rectangle to find individual areas, then add them together to find Total Slab Area . 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. Reinforced concrete for a 6-inch thick concrete slab: For a 6-inch thick slab, #4 (1/2-inch diameter) or #5 (5/8-inch diameter) thicker rebar is often used. Calculate the steel quantity required in slab as 1% of volume of concrete 0. The national average cost of a concrete slab for a garage is $6. Example Calculation: Suppose you have a concrete slab with dimensions of 10 feet by 10 feet, and you plan to use 0. are needed for a slab or concrete cores, and a quick and easy connection to get a quote on rebar, mesh, or other concrete supplies. 2-inch slab; 2-inch chairs for a 4-inch slab; 21⁄ 2- i n c h chairs for a 41⁄ 2-inch slab and 3-inch chairs for a 5-inch slab. 3) Multiply the total cubic feet needed by the 0. Substantial reduction in joints, i. Av,min=0. 56% and Equation b) for λ= 1 and ρ w > 1. For multi sided slab, first draw the shape: 1: Hit Clear + Start and enter Side Length of first side to draw, then hit appropriate direction (Arrow) button to draw. Slabs, Square Footings & Walls. The Area of a Concrete Slab calculator computes the surface area of a rectangular slab. 2. To calculate Total Area of a multi sided slab, first divide the shape into rectangles or squares. Side walks, barn and granny floors : 5 - 6 inches (0. The radius is half the diameter. in contact lapping case, one side of the rebar is covered by the other rebar. 5^2 / 162. Common rebar sizes range from #3 to #6 for slab footings, with #4 being the most commonly used. below grade) to have R-10 vertical insulation at the slab perimeter, extending downward from the top of the slab to a depth of at least 2 ft. 2. 9 of ACI 318-14 or Section 12. Density of cement = 1440 Kg/m 3. Rebar, or reinforcing bar, is used in many masonry and concrete projects to reinforce slabs and structures. 26897 kg. For slabs = 1. To. Weight (lbs/ft) = (0. "Guide for Concrete Floor and Slab Construction" ACI 360R-06. No. The effective compressive strength of a column increases as it is confined by the slab, and the. Report Application Issues or Provide Customer Feedback. I’d use #4 rebar at 12” on center each way in a 4” slab. In order to provide proper reinforcement that covers the slab evenly, rebar should be placed near the edges of the slab. imperial dimensions of rebar; Rebars - Weights Weights of rebar rods - size ranging 1/4. Rebar is a key part of reinforcing concrete and ensuring a strong and durable structure. Concrete calculators that estimate the amount of concrete and rebar you need for footings, concrete walls, concrete stairs, slabs, patios and driveways. 63ρb [ACI 318 Sec. Divide your result by the spacing measurement: 180 in / 14 in = 12. 2, Φ, is reduced to 0. Any suggestions/comments are. Determine the Pad's Area. Steel reinforcement in concrete is calculated by weight. OR, you can add reinforcing steel. 395 kg/m. A: A rebar spacer is a piece of concrete block (usually 25 to 50mm cube or 50mm dia cylindrical) intended to provide spacing between the outer surface of the finished concrete and the reinforcement inside. Add 5%-10% additional material for some waste or spills. For example, if you’re calculating rebar for a slab, input the slab dimensions, reinforcement spacing, and desired rebar size. The length of anchorage rebar depends primarily on the type of structure and the size of the rebar being used. The compression development length is calculated using Section 25. Note – it is found that for 1000 kg of steel (1000 kg = 1. 33UA/t, where P is the percentage and t is the thickness. You’ll consequently require 14 lengths of rebar. The Length and Weight of Rebar in Concrete Slab calculator computes the total length and weight of rebar needed for one or more mats of rebar in a concrete slab. For example in a slab of 6-inch depth, a rebar of 6/8 inch will be used. Similar comparisons could be made for other size s . • A cubic yard of. Concrete grade and. Calculating The Rebar Spacing For A Concrete Slab. Reinforcing schedules for a mixing and loading pad floor slab on grade with one layer of reinforcing are shown in Tables 5. Retaining Walls: The most commonly used rebars in retaining walls are #3, #4 and #5. of Main bars = (3000)/150 + 1. 35 ft. In this section, we will calculate the required reinforced steel rebar using the reference of the Australian Standard. For one layer of 6x6 W1. Total cost 1065. Figure 14 represents the plate’s local axes. As per thumb Rule, the amount of steel quantity required for an RCC roof slab should be 1% of total volume of concrete slab. R – Radius of the slab. The total quantity of steel required in the given slab is 565. Tensile stress. For Beam = 2 % concrete volume. 6. If an end-to-end distance between the lap is the least, then the lap should be provided in a staggered manner. 43/30 = 0. Choose Round Column (or Round Slab) on the calculator. 1—Introduction 12. A s,max = 0. A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. As such, I would do one of two things: 1) Effectively lap the rebar with the rebar in the elements above and below. Slab footing Rebar may be easily determined with the help of the footing Rebar calculator. ACI 318M-14 Equation 25. For example, the length is 20 inches and the width is 15 inches, the area is. 0. This reinforcing steel is called “temperature steel” and is not used for spanning soft spots, etc. If the slab will be exposed to a greater load or heavier materials, a larger rebar size may be necessary, such as #8 or #10. A slab layout plan is a drawing that you’ll get in the structural drawing book. Prices for rebar by type. Concrete slabs thicker than 4” will often need rebar, especially for heavy-vehicle parking areas. Calculate the volume of cubic yards needed to fill in a square or rectangular slab pour for flooring, walls & similar structures. Closer spacing can also increase the amount of reinforcement and decrease the potential for changes in the concrete’s surface during curing. The size and type of rebar used in concrete slab footings will depend on the specific requirements of your project, including the size of the slab, the load it will support, and local building codes. It create a bending of the slab. 260X0. 10m= 3m3. Standard Data Taken The density of Steel Rod = 7850 Kg/m 3 1 meter = 3. So, Mass = Density X Volume. Phone: 800-347-7141 | Fax: 510-490-7179. INSTRUCTIONS: Choose units and enter the following: Rebar Grid - One Mat (L) Length of Slab (W) Width of Slab (D) Depth of Slab (rS) Size of Rebar (none, 2-11,14,18) (i) Rebar Inset from the edge of the slab. They are typically made of concrete with rebar reinforcement that has been poured into an excavated trench. This spreadsheet is very useful for making design of reinforced concrete sections. The rebar within the concrete takes in some of the force applied to the concrete matrix. (default is one). the calculator will give you the default spacing values (for rebar – rebar it’s 40cm, and for edge – grid it’s 8cm). Step 1: – Calculate numbers of distribution rods. 5 to 7. e. The volume is simply the area (A = L*W) times the depth (D). Density of cement = 1440 Kg/m 3. 5%. 08 x 50 = 4 total cubic yards of concrete for 50 tubes. The volume is simply the area (A = L*W) times the depth (D). Whether you need stock rebar, fabricated rebar, or PJ’s Pre-Assembled Rebar Products, our rebar calculator can help you determine how much weight is in your job. Click the button to calculate the volume of concrete and man-hours (not including mixing) needed for this job. 0 + 6. based on the total depth of the slab). Dead load, g = (3. That is Ce = Cn + dia/2. Concrete slabs on grade are a very common type of concrete construction. e. b. g. 4. 5 % of concrete volume. g. pre-mix 80 lb bags: $8 – $15 per bag. = 565. 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. 3. 3. reduced slab thickness. 28084 feet. ;. For flat slabs, grid spacing of 18 inches for driveways and 24 inches. Every concrete slab should have a minimum. Concrete volume calculator plan view diagram. A rebar slab calculator is a tool used to determine the quantity and spacing of reinforcing bars (rebars) needed in a concrete slab. 4 = 188. So, a #4 rebar weighs approximately 0. 4 shows the thickness of concrete needed for various axle loads. Furthermore, the inevitable presence of openings in these systems because of architectural and structural considerations makes the task of evaluating safe performance more complicated [ 10 ]. Steps to Calculate Steel Quantity · Enter the Length and Width of your slab in ft in Excel Sheet. The compression development length is calculated using Section 25. Post-Installed Reinforcing Bar Guide ). (Imagine you are walking around the slab) Hit Undo Last to Undo last side. After that, the following steps will be taken to compute steel quantity. 05 percent of steel ireinforced concrete pavement, and the minimun m directions normal to each other for a distance of 3 allowable length of the slabs. Concrete Strength, Modulus of Rupture, Srinkage Coefficient, f 'c. Post-Installed Reinforcing Bar Guide. To calculate Total Area of a multi sided slab, first divide the shape into rectangles or squares. There is a formula to figure the amount of concrete for a slab, floor or patio. I am looking for information to calculate what is my required dowel rebar size and embedment length to dowel into a reinforced concrete slab? I know ACI has provisions for doweling a concrete column/pedestal into a footing, but I am trying to find something regarding doweling CMU rebar into a concrete slab. The average cost to install a concrete slab is $6 – $20 per square foot. Plain and untreated steel rebar costs $0. 87 (round up to 13) Add one rebar to your outcome: 13 + 1 = 14. Slab concrete properties definition before design optimization. Using the calculator, you would find that you need approximately 73339 pieces of rebar for the slab. 037 to get cubic yards of concrete. Sounds easy, but the trick is to de-t e r mine the amount of beam cam-This calculator uses 35% of balanced rebar area as the steel area for design of slab. The formula for the weight of a slab used in this calculator is: Wt = L•W•D•mD. The calculator will automatically estimate the number of cubic yards of concrete that will be required. The term units refers to the same units as the slab length. of Main bars = (Width of Slab/Spacing) + 1. Steel reinforcements might be in form of steel bars or welded wire mesh. Specify the spacings: rebar-rebar spacing = 40 cm, edge-grid spacing = 8 cm. Values of α 1, α 2, α 3 and α 5 may be taken as for the calculation of anchorage length but for the calculation of α 3, ΣA st,min should be taken as 1. In this article, a method is proposed for calculating the reinforcement of concrete ceiling slabs with carbon composite materials based on the finite element model in the computer program SCAD. For example, if the area is 10 feet long and 6 feet wide, the square footage is 60 feet. INSTRUCTIONS: Choose units and enter the following: (r) Radius of Circular Slab (e. 01. 2. Noncontact lapping length generally shorter than contact lapping length. 45 cubic feet. Concrete volume calculator plan view diagram. Supporting the rebar during the concrete pour is. Concrete volume calculator plan view diagram. 2. 28084 feet. calculate the required number of bars for both directions. One Way Slab Bar Bending Schedule Calculation. Number of Required Bars Formula = (Length of slab / spacing) + 1. 01. 2. If your wall is over 40 feet long it will add 2x the amount of overlap required. ) Where, L = development length. Density of Steel Rod = 7850 Kg/m 3. Concrete is ordered by volume in cubic yards. Enter Height 4 ft (or 48 in) Enter Diameter 10 in. Effectively creating a border all around the rebar grid. Input the number of mesh in slab rebar. Rebar is typically calculated at a rate of 1 for every 8 inches of footing width. 004, the strength reduction factor of ACI 318 Sec. This resulting number is the area ("A") in square feet of the concrete pad: A = L1*L2. If the shear strength is insufficient increase slab thickness until 0. You’ll find that #3, #4, and #5 size rebar is most commonly found in home reno stores and used in footings for homes and other domestic structures. (e) Crack Control According to. A 30-by-30-foot slab of concrete for a driveway, garage floor, or large patio costs $3,600–$7,200 on average. ( D) Depth of slab. 0 % of concrete volume. Call this value "L2. Convert between weight and volume measurements used with concrete. Overlap joint for rebar connections of slabs and beams and overlap joint at a . Length of bar = L or W–concrete cover for both. 5.