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minimum thickness of slab

ACI 318-14 provides suggested minimum thickness for one-way solid slab, as provided in Table 1, unless deflections are calculated. 2009-2021 The Constructor. Again, the thickness of the concrete slab will depend on what you intend to do with the slab. For a fm equal to or less than 0.20, minimum slab thickness is determined from Finally, slab thicknesses smaller than those obtained from empirical limitations can be employed if deflection calculation is within specified limits which are determined by Code. A. Formwork or Centering and Shuttering The formwork should be as per ( I S : 14687-1999). 2. We purchased 2 black walnut slabs from a gentleman and didn't realize how much moisture they had. Eventually, people move towards a good solid bench under a 1" or thicker slab. Minimum Thickness of Two Way Slab as per ACI 318-11 for Deflection Control With this type of application, both a fine and coarse aggregate are required. Generally, concrete residential house and garage slabs are 4 to 6 inches thick. As we knew that the concrete is weak in tension and strong in compression. The thinner applications would include drives, walkways, slabs and footers, just to name a few.2011-10-26. This ratio of cement concrete gives high strength of cement concrete and is recommended for following works. Different standards could specify different thickness requirements. For example, in a conventional garage, the concrete slab must be at least four inches deep to meet building code requirements. However, the minimum value code is specified for different types of foundations. Log in to TheConstructor to ask questions, answer peoples questions, write articles & connect with other people. Slab is a flat section which is perpendicular to the gravitational force. Moreover, the minimum thickness of any two way slab without interior beams should not be less than the following: Furthermore, both (afm) and (af) will be zero when beams are not employed as in the case of flat plates. For solid nonprestressed slabs not supporting or attached to partitions or other construction likely to be damaged by large deflections, overall slab thickness h shall not be less than the limits in Table 7.3.1.1, unless the calculated deflection limits of 7.3.2 are satisfied. The minimum thickness for plain concrete structural footing is suggested by ACI 318-14 and set as 200mm, and the same value is suggested by UBC. a Minimum 8 bars b Method B may be used which indicates 600/70 for R 240 and = 0.7. I just got my lee valley router sled and built a table and my 2" thick slabs will end up being 1" - 1-1/4" give or take. The flexural stiffness of the slab is increased with increasing the thickness of the slab; as a result the deflection of the two-way slab is declined. . My concrete guy insists on 4; however, to make it all level it's really going to end up being 5 in places. Workability tests conducted on freshly prepared concrete, Manufacturing of cement in the industry ? Minimum thickness of the concrete slab totally depends on types of slab-like one way or two way, a span of slab, design load. The column dimensions for various floors is explained in my previous post please click here to read. Further, slab reinforcement will be obstructed by the beam reinforcement, and they wont be able to place as considered in the calculation. A 6-mil (0.006 inch; 0.15 mm . LL = 6.76 Slab designation: CS1 Check if one-way or two-way slab 1 Slab is one way since it is catilever slab Minimum slab thickness min t = 69.5 try 100 mm Dead load Slab weight = 2.36 Live load Canopy = 1.9 Factored loads Factored dead load = 3.3 Factored live load = 3.23 Total factored load = 6.53 Compute moments At support: ( - ) M1 = 3.27 . For example, if your rack design required the anchor bolt nominal embedment to be 4-5/8" the slab must be at least 7" thick (See minimum member . ACI 318 - 11: Minimum Thickness of beams and one-way slabs. The following the various thickness of the slab section we will consider per standards. Slabs are supported on Columns and Beams.2021-08-22, The major types of concrete slabs used in construction are one-way joist slab, flat slab, flat plate, waffle slab, hollow core slab, precast slab, slabs on grade, hardy slab, and composite slab.2018-12-24. Note: Depending upon the various building design considerations the slab thickness varies. Take the thickness of your concrete and divide it by 12. Table 3. The engineer has approved the weight load. The deflection of two way slab is based on a number of parameters for example the flexural stiffness of the slab which is the function of slab thickness. However, we can calculate the basic requirements of minimum thickness considering the above factors. Therefore, the minimum concrete thickness can be calculated as follows. How thick is a concrete foundation slab? For simply supported one-way solid slabs, Minimum Slab Thickness = l/ 20 b. Flat plates are commonly used in buildings where relatively low gravity loads are applied.2012-07-01. The minimum slab thickness for a garage is both determined and influenced by several factors. Typical slabs tend to range from about four to six inches thick. Therefore, the minimum concrete thickness can be calculated as follows. Members not supporting or attached to partitions or other construction likely to be damaged by large deflections, Levelling concrete below liquid retaining structures, Levelling concrete for other RCC foundations, Underground pit / reservoir (below ground water table) walls and slab, Underground pit (above water table) walls and slab. For afm larger than 0.2 but not larger than 2, the slab thickness must not be less than the values of equation-1: ln: clear span measured in long direction face to face of column or face to face of beam for slabs with beams, : Ratio of clear span in longer direction to clear span in shorter direction, afm: Average value of (af) for all beams on the sides of a panel. For other conditions, the values shall be modified as follows: a) For lightweight concrete having equilibrium density (wc) in the range of 1440 to 1840 kg/m3, the values shall be multiplied by (1.65 0.0003wc) but not less than 1.09. b) For fy other than 420 MPa, the values shall be multiplied by (0.4 + fy/700). Depending upon the building design consideration the thickness of slab section changes. Sep 9, 2022 - Minimum Thickness of Concrete Slab, Minimum Thickness of Ribbed Slab, Minimum Thickness of Slab on Ground, Minimum Thickness of Drop Panel, Minimum Thickness of Beams, Minimum Thickness of Columns, Minimum Thickness of Walls, Minimum Thickness of Footings, Minimum Thickness of Other Concrete Members What is the minimum thickness of concrete floor? The only time a slab should be thicker when it will withstand heavy weight of some kind, such as trucks transporting . The minimum thickness for concrete slabs should be 50 mm. The concrete slab construction process includes the preparation of formwork, compaction of a slab bed, placement of reinforcement, pouring, compacting, finishing the concrete, removing formwork and curing the concrete slab. Fig.3: slab on ground. Table-1: Minimum thickness of slabs without interior beams. . Then we have to increase the column sizes, reinforcements, foundations sizes, etc. That is why majority of codes provide minimum dimensions and specifically thicknesses for almost all structural elements. The minimum thickness of slab is specified by ACI 318-11, section 9.5.3. The one way slab is the section which is generally used if the ratio of longer span to smaller span is greater than or equal to 2 factor. The minimum thickness of drop panels shall be quarter of slab thickness beyond the drop. Please use these values only for education purpose for clearly understanding the concepts in slab design. Your email address will not be published. ACI 318-14 provided recommendations to determine minimum thickness of slabs (including slabs with beams, flat slabs, flat plates) that can be found here. Minimum Slab Thickness. Deflection of two way slab could be calculated by using available methods to make sure that the deflection will not be problematic and will not exceed serviceability limitations. This is the thickness of the concrete slab alone and it doesn't include the gravel base, if you are using something like that. https://www.youtube.com/watch?v=IAPWRv6QrC0. Element designs with notes and discussions have added to get comprehensive knowledge. This the theoretical requirement for the thickness of the slab. We are not really interested in Gyp-Crete as there . See BS EN 1992-1-2 Table 5.2b. Theme: Newsup by Themeansar. Commercial Driveways: The minimum depth for commercial driveways is 6 inches or 8 inches, depending on the municipal code covering the site. Concrete slab thickness = 20 x 2 + 10 x 4 + 20+5 = 105 mm. Design the slab following the provisions of the ACI code. A topping slab is a concrete slab poured over an existing subfloor, generally made of concrete or plywood. Where, 'w' is the intensity of upward pressure. Minimum Thickness of Slabs 1.1 Minimum thickness of One-way slab. Unified Building Code (UBC) specified minimum thickness of ribbed slab to be 1/12 distance between ribs or 51mm. Highways: The slab thickness on a highway depends on . The slab is supported on the all the four sides in this case, loading distribution will takes all directions equally. Save my name, email, and website in this browser for the next time I comment. As an illustration: Dividing six by twelve gives you five percent (a 6-inch slab is .5 feet thick) One hundred forty-five pounds per cubic foot x.5 = 72.5 pounds per cubic foot or 72.5 pounds per cubic meter. The objective of this work is to determine the minimum slab thickness of a reinforced concrete building to prevent undesirable vibration. In this background, the widely used concrete slab thickness is 125mm. Standard concrete floor slab thickness in residential construction is 4 inches. Depending upon the building design consideration the thickness of slab section changes. Beams bending strength of concrete ? JoeBaseplate (Structural) (OP) 8 Jun 11 17:40. According to work arrangement laying of RCC slab can be done in 3 stages such as formwork or centering and shuttering, bending and binding MS steel bars and laying of concrete. The use of .5-in.-diameter, 270 ksi (1860 MPa) strand permits 4.5- and 5-in.- thick (110 and 125 mm) slabs to meet both the minimum 125 psi (0.85 MPa) average precompression and the maximum tendon Concrete international / MARCH 2003 77 The developed FE model has been successfully applied to . The calculation is only based on the construction and detailing requirement according to BS 8110 Part 01. Five to six inches is recommended if the concrete will receive occasional heavy loads, such as motor homes or garbage trucks. 8000mm / Eff. Example if we take maximum coarse aggregates size is 20mm then we have to take 4X20=80mm minimum as per IS code provisions. Four to six inches is the usual range. (25 to 50 mm) for a fully bonded concrete overlay placed on a base slab that is practically free of cracks and in which the concrete is sound, clean, and of good quality. We have since bought a moisture meter. For single floor which is of 3m height building the minimum slab is 100mm, for two floors which is of 6m height building the minimum thickness is 125mm, for three floors which is of 9m height building the minimum . Unfortunately that means that the new floor will be an inch higher than the one in the connecting room. According to it, the specified thickness values are as follows: a. hey everyone, looking at making a live edge river table. However, as calculated, reinforcements can not be placed as precisely as calculate to maintain the gap between the bars as aggregate size + 5. The first stage of the design is finding the bending moment of the slab panels. When you join you get additional benefits. Please follow my YouTube Channelfor more topics and concepts related to the civil engineering. https://www.concreteconstruction.net/how-to/construction/concrete-floor-slabs_o, https://www.homes247.in/blogs/rcc-construction-technology-153, https://www.gharexpert.com/tips/articles/Construction/1519/Roofing-Ceiling-1519-RCC-Roofing_0, https://civiconcepts.com/blog/what-is-rcc, https://www.slabmateinsulation.com.au/concrete-floor-slab-construction-process-2020/, https://ijcsm.springeropen.com/articles/10.1007/s40069-012-0011-2, https://thecivilengineerings.com/useful-guidelines-for-design-of-rcc-slab-basic-rules-for-slab-design/, https://thecivilengineerings.com/minimum-thickness-of-concrete-slab-beam-column-and-foundation/, https://www.totalconcrete.co.uk/concrete-grades/, https://www.gharexpert.com/tips/articles/Construction/2375/Brick-Walls,-Pillars-Structure-2375-Tips-Laying-RCC-slabroof_0, https://civilsir.com/best-concrete-mix-ratio-for-roof-slab-beam-and-column/, https://www.civilexperiences.com/minimum-thickness-of-rcc-slab/, https://civilsir.com/minimum-thickness-of-rcc-slab-as-per-is-456/, http://www.gharexpert.com/ques_ans/Ans_To_ques.aspx?QID=382&CatID=, https://en.wikipedia.org/wiki/Reinforced_concrete, https://www.sciencedirect.com/topics/materials-science/reinforced-concrete, https://theconstructor.org/structural-engg/flat-slab-types-design-advantages/13919/, https://theconstructor.org/practical-guide/concrete-slab-construction-cost/28153/, https://extremehowto.com/what-is-the-minimum-thickness-for-concrete/, https://www.dcpu1.com/blog/different-types-of-concrete/. t = Minimum thickness of plate in inches after forming . It shall be known that plain structural footing is not suitable to be used for the top of piles. Slab thickness = 150mm Live Load = 2.5 kN/mm 2 Finishes and partitions = 1 kN/mm 2. Serviceability requirements such as deflections, Serviceability requirements such as floor vibrations, Lateral Load Resisting System [Building Design], Design and Construction of Tunnel Junctions, Hot Dip Galvanizing -The Facts to be Aware, 14 Types of Structural Forms for Tall Buildings, All About Shear Wall [Design Considerations], Design of Deep Beam [ all you need to know ], Galvanizing vs Painting [ a in depth comparison ], Ground Beam Design [key factors to be considered], How to Calculate Uplift Pressure on Foundations, Moment Redistribution in Reinforced Concrete Beams, Punching Shear Design a Detailed Discussion, Structural Analysis of Buildings a Detailed Study, Thrust Block Design [Theory and Worked Example]. Four inches is most common for a slab. Key factors affecting the minimum thickness of slab can be listed as follows. ACI 318-14 specify that, conduits and pipes shall not be larger in outside dimension than 1/3 the overall thickness of slab, wall, or beam in which they are embedded. Flat slab is defined as one sided or two-sided support system with sheer load of the slab being concentrated on the supporting columns and a square slab called drop panels.2016-10-26, Reinforced concrete (RCC) contains embedded steel bars, plates, or fibers reinforcing the material. Please enter your email address. How is a Raft Slab Built. The thickness of a slab is important to decide its longevity. The thinner applications would include drives, walkways, slabs and footers, just to name a few. In residential buildings, the minimum thickness of a raft slab is 85mm (3.35 inches) in waffle slab construction and 100mm (4 inches) in raft slab construction. What is the slab thickness in building design ? All Rights Reserved. Portable is nice, which goes against using 3 or 4 inch thick slabs. Finally, it affects the cost of construction. a & b are projections of smaller and larger side. Minimum thickness for concrete pour. Well now the explained concepts are related to the slab thickness for various floors from ground floor to G+9 building designs. Therefore, Steel reinforcement is added in concrete to improve its tensile resistance. The minimum thickness of slab is specified by ACI 318-11, section 9.5.3. What is the tolerance for compression test results of concrete, according to the standards? Standards like ACI 318 have specified the minimum thickness of the slab based on the span of the slab. For one end continuous one-way solid slabs, Minimum Slab Thickness = l /24 c. Required fields are marked *. Consider a slab panel with two adjacent edgers discontinues. The two way slab is the section which is generally used if the ratio of longer span to smaller span is less than 2 factor. Minimum Clear spacing between bars based = aggregate size + 5; generally, we use 20mm aggregate for concrete works. Minimum thickness for two way slab construction designed as per methods provided by ACI 318-11 Code namely, direct design method and equivalent frame method. 8000/20 = Eff depth = 400mm. ACI Code limitations for minimum thickness of two way slab are discussed in the following sections. That is the bare minimum of a concrete slab thickness. The minimum recommended thickness is 1 to 2 in. sometimes drop panels used at top of columns to improve shear strength of slabs. In the other hand . How thick must a concrete floor be? Thickness Estimation: For being both ends continuous minimum slab thickness = L/28 =(15 x 120)/28= 6.43 in. What is the slab thickness in building for various floors ? The service live load is 100 psf and 4000 psi concrete is specified for use with steel with a yield stress equal to 60000 psi. UBC specified minimum thickness of exterior basement wall and foundation wall to be 191mm. Minimum reinforced concrete wall dimensions and axis distances for load-bearing for fire resistance. Canadian Standard Association CSA provides similar table except for one end continuous which is l/18. Cover to the reinforcement = 20mm which is minimum specified in the code for mild exposure condition with one-hour fire resistance. Design process includes proper assumption of structural element sizes and then check the suggested dimensions to make sure that it meets the requirements of the design. From what I have read the minimum thickness for thin concrete slab seems to be 2", although I have also seen references to 1 1/2". Section 1907 Concrete, Minimum Slab Provisions. Slab design is comparatively easy when compared with the design of other elements. Such materials magnify the load-carrying capacity, and because of this, RCC construction is commonly used in any building. Whatever you plan on doing, your concrete slab should be at least 5 cm thick. Depth of a simply supported one way . UBC recommends minimum thickness of Concrete floor slabs supported directly on the ground to be 89mm, whereasBCGBC4010A Apply structural principles to residential low-rise constructions determined minimum thickness to be 100mm. The panel with drops is 1.25 to 1.50 times thicker than the slab beyond the . The thinner applications would include drives, walkways, slabs and footers, just to name a few.2011-10-26, What is the minimum thickness for concrete? The minimum depth for footing on soil is advised to be 150mm. The suggested thickness of a slab for crawl space is a minimum of 2 inches so that it should not be disposed of and also would not . Column Dimensions Simply Supported Slab = L / 20; One End Continuous Slab = L / 24; Both End Continuous Slab = L / 28; Cantiliver = L / 10 However, in other criteria, they do not directly specify the minimum slab . If proper structural dimension is not assumed, then the design would be time consuming and required considerable effort since substantial trials will be involved till satisfactory dimensions are specified. What must be the maximum dry density of Granular Sub Base & Wet Mix Macadam used What is the Safe Bearing Capacity values for Different Soils? Table 4: minimum thickness for other structural elements. But it depends on your work area and what you have at hand to work with. The minimum RCC beam size should not be less than 9 9 or 225mm 225mm with the addition of a 125mm slab thickness. In order to prevent excessive deflections and avoid calculation of two way slab deflection which is a complicated procedure, ACI 318-11 restricts the minimum thickness of two way slab by applying three empirical limitations. Therefore, we should limit the thickness in any construction to the limits required by the design(serviceability and ultimate limit state). Other than that, the concrete mix grade also an important f. All Rights Reserved. What is the minimum thickness for a concrete slab? Ratio of clear span in longer direction to clear span in shorter direction. For afm greater than 0.2 but not greater than 2, the slab thickness should not be less than the values of equation-1: Where: h: Minimum slab thickness. What are the different types of handrails used in bridges? What is the tolerance for compression test results of concrete, according to the standards? Lastly, ACI Code equations applied to calculate slab thickness take the panel shape, the influence of span length, the flexural stiffness of beams, and the yield stress of steel reinforcement into consideration. ln: clear span measured in long direction face to face of column or face to face of beam for slabs with beams. When you join you get additional benefits. What is the minimum thickness for a concrete slab? A: Concrete is typically applied at a thickness of 2 inches or more, but the thicker it is, the stronger the slab will be. Table 2 minimum thickness of non-prestressed beams unless deflections are calculated. Depending on use, most concrete companies recommend a minimum slab thickness of three to four inches for a residential concrete installation. Four inches is most common for a slab. 16cm thickness is quite reasonable for slab with single layer reinforcement Quite a few times I've seen 5" (127mm) or less (with wire mesh) were used. Reinforced concrete (RC), also called reinforced cement concrete (RCC) and ferroconcrete, is a composite material in which concretes relatively low tensile strength and ductility are compensated for by the inclusion of reinforcement having higher tensile strength or ductility. Standard concrete floor slab thickness in residential construction is 4 inches. Minimum Slab Thickness of Two-way Edge-supported Slabs As specified by ACI Code 9.5.3.3 and 9.5.3.2, for slabs with beams spanning between the supports on all sides, the minimum thickness shall be as follows: a. liberty university football camp. Log in to TheConstructor to ask questions, answer peoples questions, write articles & connect with other people. the minimum thickness for a basement concrete slab is 3-1/2, however I never pour less than 4 for uniform residential loading. The thinner applications would include drives, walkways, slabs and footers, just to name a few.2022-03-06, Your email address will not be published. Therefore, it is very very difficult to achieve these requirements. UBC recommends minimum thickness of Concrete floor slabs supported directly on the ground to be 89mm, whereas BCGBC4010A - Apply structural principles to residential low-rise constructions determined minimum thickness to be 100mm. Concrete slab thickness = 20 x 2 + 10 x 4 + 20+5 = 105 mm. UBC recommends minimum thickness of Concrete floor slabs supported directly on the ground to be 89mm, whereas BCGBC4010A - Apply structural principles to residential low-rise constructions determined minimum thickness to be 100mm. Minimum Thickness of Concrete Slab, Beam, Column, Foundation, Slab thickness with embedded conduits and pipes, 1.3Minimum thickness ofSlab on the ground, 4.2 Exterior basement wall and Foundation wall, 6. How to make cement in the factory ? For example, in a high-rise building, an increase in the thickness of slab by 5mm result significantly increase column axial loads. 7.3.1. THE STANDARD SIZE OF THE COLUMN The size of the columns depends on the total load on the columns. The slab thickness for various floors of building are explained in, Conclusions for slab thickness in building for various floors, The column dimensions for various floors is explained in my previous post please, The beam dimensions for various floors is explained in my previous post please, for more topics and concepts related to the civil engineering. ACI 117-10 does not specify a plus slab thickness . Minimum thickness of concrete structural elements based on ACI 318-14, IRC 2009, IS 456 2000, and UBC 1997 is presented. Ib and Is: Moment of inertia of beam and slab respectively. ACI 318-14 provides suggested minimum thickness for one-way solid slab, as provided in Table 1, unless deflections are calculated. Also, construction materials, shoring system design, water retaining structures, crack width calculations, etc. However, if a recreational vehicle or other heavyweight item will drive across or be placed on the foundation, the recommended slab thickness is . af: is the ratio of flexural stiffness of the beam section to the flexural stiffness of the slab bounded laterally by centerline of the panel on each side of the beam. below the thickness of 1.5 mm of a test piece . A Reinforced Concrete Slab is the one of the most important component in a building. When you join you get additional benefits. And for two way slab, the minimum is 125mm (ACI318-11). RCC full form is reinforced cement concrete, which is a composite material made from concrete and steel reinforcement. Sorry, you do not have permission to ask a question, You must log in to ask a question. Most building codes require concrete patio slabs to be laid at a minimum thickness of 3.5 inches with a compressive strength of 3,000 PSI. Deflection of two way slab could be calculated by using available methods to make sure that the deflection will not be problematic and will not exceed serviceability limitations. Notes:Values given shall be used directly for members with normal weight concrete and Grade 420 reinforcement. Minimum thickness of slab. Step 1 - Set Out 1. And for safety, a layer of gravel & bitumen are laid on earth before laying concrete slab to prevent the entry of moisture content into the slab. Structural loads, structural analysis and structural design are simply explained with the worked example for easiness of understanding. The thickness of Grade Slab is kept minimum 4 inches. Sorry, you do not have permission to ask a question, You must log in to ask a question. Five to six inches is recommended if the concrete These grades indicate how strong the concrete is and how it will be used in construction.2020-03-28, A: Concrete is typically applied at a thickness of 2 inches or more, but the thicker it is, the stronger the slab will be. I won't go that far though. 1.3 Minimum thickness of Slab on the ground. Computation of is according to the following equation: Ecb and Ecs: concrete modulus of elasticity of beam and slab respectively which is usually the same. Country Minimum Thickness of Other Concrete Members, REQUIREMENTS OF CONCRETING IN SPECIAL CASES, Benefits of Using Steel Fibers in Concrete, Space Frame Structure: Components, Types, and Advantages, 8 Types of Structures in Civil Engineering, Types of Foundation for Buildings and their Uses [PDF], Compressive Strength of Concrete -Cube Test [PDF], Procedure, Results, 16 Types of Heavy Equipment Used in Construction, Methods of Rainwater Harvesting [PDF]: Components, Transportation, and Storage, Calculate Quantities of Materials for Concrete -Cement, Sand, Aggregates, Role of Structural Engineers in Designing Earthquake-Resistant Buildings, Considerations for Engineer when Designing a New Structure. There are two types of slabs which are described below. 1. 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minimum thickness of slab