how to reduce thickness of concrete slab

Lowering a Concrete Floor (might be a silly idea ...

Sep 04, 2004  Lowering a Concrete Floor (might be a silly idea!) Discussion in ' Builders' Talk ' started by aixlad, Jun 5, 2004 . I want to lay Limestone slabs on an existing Concrete floor, but I don't want to raise the level of the floor! I have seen that aged, random sized, natural Limestone slabs are available, they range between 15mm and 20mm in thickness.

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You Say Your Slab is How Thick? - Concrete Fiber Solutions

Nov 06, 2015  There are at least two safe, conservative ways to reduce slab thickness with steel fibers. They involve flexural strength and the elimination of corner and edge loading. Anything that raises concrete’s flexural strength will increase a floor’s load capacity, and can potentially allow a thinner slab.

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How thin is too thin? Evaluating slab thickness in ...

Jul 03, 2014  Slab design must be checked for required additional reinforcement at penetrations. Pros of a thinner slab There are several benefits to specifying thinner slabs from a structural perspective. One obvious advantage is less concrete is required. Consequently, a reduction in concrete also decreases the gravity loads on the vertical load-carrying ...

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How to thicken an Existing Concrete Slab on Grade ...

May 17, 2008  You may have a more serious problem than just pouring the slab too thin. Even if the slab was poured exactly to specified thickness, you may have gotten the same cracking, curling and deflection for other reasons (sub-base prepartion, slab reinforcing and jointing, concrete mix design, concrete curing, etc.).

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Ch. 11 SlabDesign OneWay) MinimumSlab Thickness

Theoverall `i:ickness of mostone-way slabs is established bythe American Concrete In-stitute (ACI; Code provisions for minimum thickness. In lieu of providing accurate de-flection computations. the Code indicates that the minimum "thickness of construc-tion" values of Table 11.1 maybe used. For many beards the proportions dictated by

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How To Cut A Thick Concrete Slab - Megasaw

Depending on the thickness of the concrete slab, the cuts must be spaced between 24 to 36 times the slab thickness. And depending on the amount of reinforcement the concrete slab has, control joint spacing is normally set at 3 to 5 metres apart. You can reduce the cut spacing for high-shrinkage concrete.

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You Say Your Slab is How Thick? - Concrete Fiber Solutions

Nov 06, 2015  There are at least two safe, conservative ways to reduce slab thickness with steel fibers. They involve flexural strength and the elimination of corner and edge loading. Anything that raises concrete’s flexural strength will increase a floor’s load capacity, and can potentially allow a thinner slab.

get price

Ch. 11 SlabDesign OneWay) MinimumSlab Thickness

Theoverall `i:ickness of mostone-way slabs is established bythe American Concrete In-stitute (ACI; Code provisions for minimum thickness. In lieu of providing accurate de-flection computations. the Code indicates that the minimum "thickness of construc-tion" values of Table 11.1 maybe used. For many beards the proportions dictated by

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How Thick of a Concrete Slab Do I Need Service Seeking

Mar 27, 2019  However, the usual thickness of a concrete slab is around 10 cm. Whatever you plan on doing, your concrete slab should be at least 5 cm thick. That is the bare minimum of a concrete slab thickness. This is the thickness of the concrete slab alone and it doesn’t include the gravel base, if you are using something like that.

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Thickness of Slab : How to determine? - Structural Guide

Concrete slab thickness = 20 x 2 + 10 x 4 + 20+5 = 105 mm. This the theoretical requirement for the thickness of the slab. However, as calculated, reinforcements can not be placed as precisely as calculate to maintain the gap between the bars as aggregate size + 5. Further, slab reinforcement will be obstructed by the beam reinforcement, and ...

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How thick should a concrete slab be for a driveway? - Quora

There is not a simple answer here. Driveway slab thickness is dependent on several factors. Vehicle weight, number of vehicle load repetitions, Sub grade support characteristics, underlying base rock thickness, steel reinforcement, and concrete co...

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How thick does concrete need to be to not crack?

Aug 27, 2020  Depending on the design, application, and installation practice, your concrete could be as thin or as thick as you want it and still wind up cracking. There are some rules of thumb for about how thick you need to make things like garage floor slabs to prevent the bad kinds of cracking, but they vary a little bit from application to application.

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Concrete floor slabs on ground Old House Web

The slab should be reinforced with six by six inch No. 10 wire mesh or other effective reinforcing. The concrete slab should be at least four inches thick. A monolithic slab is usually preferred in termite areas. After leveling and screeding, the surface should be floated with wood or metal floats while concrete is still plastic.

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How thick should a concrete slab be for a carport? - Quora

Jan 23, 2021  Depends on the install. A 2x4 is 3 1/2″ thick and to get the required strengh you should use rebar and a slump that resembles plastic. I’ve always used 2x6 for the forms if I was going to park a car on it. Rebar adds strength wire only keeps crack...

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Rebar in Concrete: Does Concrete Slab, Patio, Driveway ...

The thickness of rebar should be no more than 1/8 that of the slab, so a 4” slab shouldn’t have steel greater than #4 or 1/2″ bar. It’s best to check with a Structural Engineer if your slab will bridge or cantilever. For 4” concrete slabs used for driveways and patios, #3 rebar is common.

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how to reduce thickness of concrete slab

Cure the concrete thoroughly. ACI 117-06. Reinforcement partially buried in the subbase does not provide crack width control. February 2, 2021, 12:42 pm, by So for a 25cm concrete slab, you cut 5 to 6cms. Increasing the thickness to 5 inches requires 11 cubic yards of concrete.

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Concrete Contraction Joints - How To Minimize Cracking In ...

Follow these recommended practices when installing concrete contraction joints: 1. The maximum joint spacing should be 24 - 36 times the width of the slab. In a 4" thick slab the joint spacing should be 10 feet. It's also recommended that joint spacing be limited to a maximum of 15 feet.

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Do You Need Rebar For 4-Inch Slab? (Should You Reinforce)

Sep 02, 2020  Finally, the role of the concrete impacts the necessary thickness of the covering. Ground slabs and walls require less concrete over the rebar than columns or beams. For cast-in-place concrete that will be in contact with the ground permanently, the recommended covering concrete thickness is 3 inches. For cast-in-place slabs less than 5 inches ...

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Flooring: protecting a concrete slab - Soundproofing Company

3/4” Plywood – 1200Hz. 6” Concrete – 123Hz. The great mass of the slab will generally isolate sound vibration quite well, except at and around the Coincidence Point (frequency). At this coincidence frequency and thereabouts, the slab may conduct vibration quite well. To guard against this, we set up a barrier with Serena Mat and plywood.

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How To Cut A Thick Concrete Slab - Megasaw

Depending on the thickness of the concrete slab, the cuts must be spaced between 24 to 36 times the slab thickness. And depending on the amount of reinforcement the concrete slab has, control joint spacing is normally set at 3 to 5 metres apart. You can reduce the cut spacing for high-shrinkage concrete.

get price

how to reduce thickness of concrete slab

Cure the concrete thoroughly. ACI 117-06. Reinforcement partially buried in the subbase does not provide crack width control. February 2, 2021, 12:42 pm, by So for a 25cm concrete slab, you cut 5 to 6cms. Increasing the thickness to 5 inches requires 11 cubic yards of concrete.

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Using Air to Reduce the Weight and Amount of Concrete Used ...

Aug 19, 2013  The technology can reduce the weight of a solid concrete slab by as much as 35 percent. Created in Denmark, and used throughout Europe since the 1990s and Canada since the mid-2000s, BubbleDeck technology has played an integral role in the design and construction of three U.S. projects in the past two years.

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How to Determine Concrete Slab Thickness Why You Need To ...

Jun 01, 2021  For slabs drying from one side, the depth is 40% of the thickness. For slabs drying from two sides, the depth is 20% of the thickness. For that reason, knowing the thickness of the concrete slab is critical. This test is called “the relative humidity test using in situ probes,” and it’s the basis for the ASTM F2170 standard.

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Thickness of Slab : How to determine? - Structural Guide

Concrete slab thickness = 20 x 2 + 10 x 4 + 20+5 = 105 mm. This the theoretical requirement for the thickness of the slab. However, as calculated, reinforcements can not be placed as precisely as calculate to maintain the gap between the bars as aggregate size + 5. Further, slab reinforcement will be obstructed by the beam reinforcement, and ...

get price

How Thick Does Concrete Need to Be to Hold Up Weight ...

Concrete Thickness. For flatwork, such as slabs-on-grade and driveways, a minimum thickness of four inches is required, but increasing the thickness to five inches can add nearly 50 percent to the load-bearing capacity. Thickening the structure along the perimeter by another will serve as an integral footing, adding strength where the loads are ...

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How thick should a concrete slab be for a driveway? - Quora

There is not a simple answer here. Driveway slab thickness is dependent on several factors. Vehicle weight, number of vehicle load repetitions, Sub grade support characteristics, underlying base rock thickness, steel reinforcement, and concrete co...

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Is it possible to lower a concrete sub floor that has been ...

best option is to break out floor, lower the ground by at least 90mm (allowing for a minimum 50mm screed top layer) and re concrete with minimum 100mm thick concrete. expensive way but who laid the concrete 40mm high in the first place is my question????? you could take 40mm off the concrete depending how deep the concrete base is but if it is a sub base then it should be screeded on top to ...

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Flooring: protecting a concrete slab - Soundproofing Company

3/4” Plywood – 1200Hz. 6” Concrete – 123Hz. The great mass of the slab will generally isolate sound vibration quite well, except at and around the Coincidence Point (frequency). At this coincidence frequency and thereabouts, the slab may conduct vibration quite well. To guard against this, we set up a barrier with Serena Mat and plywood.

get price

How thick should a concrete slab be for a carport? - Quora

Jan 23, 2021  Depends on the install. A 2x4 is 3 1/2″ thick and to get the required strengh you should use rebar and a slump that resembles plastic. I’ve always used 2x6 for the forms if I was going to park a car on it. Rebar adds strength wire only keeps crack...

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5 Ways to Prevent Cracks in Concrete—and 1 Easy Fix - Bob Vila

Even just one additional quart of water can reduce concrete’s strength by up to 40 percent! When mixed correctly, ... For example, if you want a four-inch-thick slab, dig down seven inches and ...

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How To Cut A Trench In A Concrete Slab? (5 Steps ...

Feb 01, 2021  Step 4: Cut the concrete. Cut the concrete as based on your guide cut, rotate the depth handle to lessen the blade sharpness if needed. Slowly push the saw forward until the first edge of the trench is cut. Raise the blade then pull the saw back to the end of the trench and cut the second edge similar to what you did with the first edge.

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Slab Curling: Causes and Prevention Concrete Construction ...

Dec 01, 1999  Avoid ordering concrete containing admixtures that may increase shrinkage, such as calcium chloride and some water reducers. Another method for reducing curling caused by drying shrinkage is placing the slab on a granular layer that absorbs water from the bottom of the slab, thus equalizing drying of the slab top and bottom.

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How long does a concrete slab take to dry?

A 180mm below-grade slab drying from one side only with a w/c = 0.6, adjusted for 30ºC 35%RH = 211 days. (i.e. 351 x 0.6 = 210.6) These corrections show how much ambient site conditions can improve or impair the drying time of concrete and how important it is to monitor these conditions for the duration of the drying phase.

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