Best answer

Usually, expansion joints should be no farther apart than 2 to 3 times (in feet) the total width of the concrete (in inches). So for a 4 inch thick concrete slab, expansion joints should be no more than 8 to 12 feet apart.

Answered by: arsho Date created: Jun 20, 2022

Can I pour my own concrete slab?

Asked By: Matt Ward Date created: Jun 14, 2022

Pouring a concrete slab yourself can be a big money-saver or big mistake. We show you the best techniques and tools so you get concrete forms right the first time.

Answered By: phd Date created: Jun 14, 2022

How do I keep my concrete slab from sinking?

Asked By: Zoredache Date created: Jun 18, 2022

How can I prevent my concrete from sinking?Seal all open cracks and joints with a polyurethane or silicone caulk. ... Make sure downspouts are discharging at least five feet away from any concrete slab – the farther the better.More items...•

Answered By: dbenham Date created: Jun 18, 2022

Why is my plaster cracking?

Asked By: chris Date created: Jun 21, 2022

First it could be shrinkage that comes when plaster and render dries, or it could be weather erosion, or moisture movement, or thermal expansion that causes expansion and then shrinkage. In short, any traditional plaster or render, without proper supporting materials will always crack.

Answered By: RRiVEN Date created: Jun 21, 2022

How many blocks can 1 bag of cement produce?

Asked By: Bjorn Mistiaen Date created: Jun 05, 2022

801 bag of cement can lay approximately 70 to 80 cement blocks. So if 1 brick layer plus a cement mixer can work with three bags per day you will be saving big time!

Answered By: Saptarshi Basu Date created: Jun 07, 2022

Does concrete slab need reinforcement?

Asked By: k0pernikus Date created: Jun 15, 2022

If a slab is installed on a subbase that is of high quality and that offers uniform support, it is usually not necessary to reinforce the concrete. However, if the subbase is problematic or the spacings of the joints are greater than 15 feet, reinforcement should be used.

Answered By: maytham-ɯɐɥʇʎɐɯ Date created: Jun 16, 2022

Do you have to pour concrete all at once?

Asked By: usr Date created: Jun 14, 2022

If you don't pour the whole thing at once, you get cold joints. Cold joints happen when concrete poured into a slab is allowed to partially or completely dry before more concrete is added. Cold joints usually don't look good at all. ... So that won't work for a slab this size.

Answered By: David Anderson Date created: Jun 17, 2022

Do I need rebar for small concrete slab?

Asked By: Niamona Date created: Jun 13, 2022

You do not need rebar for any slab if you make it thick enough and space the joints properly. Rebar in jointed pavement is there to counter the cupping effect of thermal expansion. I always recommend the use of rebar or at least rewire. Any concrete slab can crack.

Answered By: Andy E Date created: Jun 13, 2022

At what temperature does concrete melt?

Asked By: Rohit Vats Date created: Jun 16, 2022

At 450-550 °C the cement hydrate decomposes, yielding calcium oxide. Calcium carbonate decomposes at about 600 °C. Rehydration of the calcium oxide on cooling of the structure causes expansion, which can cause damage to material which withstood fire without falling apart.

Answered By: Joran Beasley Date created: Jun 16, 2022

Are concrete expansion joints necessary?

Asked By: JSON Derulo Date created: Jun 14, 2022

Expansion joints are virtually never needed with interior slabs, because the concrete doesn't expand that much—it never gets that hot. Expansion joints in concrete pavement are also seldom needed, since the contraction joints open enough (from drying shrinkage) to account for temperature expansion.

Answered By: Joshua Ulrich Date created: Jun 15, 2022

Can cement be used without sand?

Asked By: Eddie Date created: Jun 05, 2022

Can cement be used without sand? Yes, cement can indeed be used without sand. Cement and water can be used as a slurry.

Answered By: B12Toaster Date created: Jun 08, 2022

Related Question Answers

Frightera

Professor

Can you pour concrete by yourself?

Introduction. Pouring a concrete slab yourself can be a big money-saver or big mistake. We show you the best techniques and tools so you get concrete forms right the first time.

Dali Hamza

Professor

How do I fill the gap between concrete floor and wall?

Once a year, go around your home and fill these gaps and joints with urethane caulk (or polyurethane caulk) to prevent problems. The expansion joint caulk is available at contractor supply stores, well-stocked home centers and hardware stores. For gaps and joints more than 1/4 in.

exhuma

Professor

How do you calculate expansion joints in concrete slabs?

The following recommended tips should be observed:Maximum Joint Spacing should be 24 to 36 times the thickness of the slab.Joints should be spaced about 10 feet and a maximum of 15 feet.When using joint groove for contraction joints, the joint should be a minimum depth of ¼ thickness of the slab.More items....

Hailwood

Professor

How do you install concrete expansion joints?

The easiest way to add expansion joints is to do it during the pouring of your cement slab. As you finish pouring each section of your driveway, slip an expansion joint into the form between the section you've just poured and the section you are about to pour.

Ron M

Professional

Do concrete expansion joints need to be sealed?

Expansion joints must be sealed with a flexible sealant, like QUIKRETE® Self-Leveling Polyurethane Sealant or QUIKRETE® Non-Sag Polyurethane Sealant…or an expansion joint strip, to prevent water from penetrating the joint and deteriorating the sub-base.

Simone Carletti

Professional

Do concrete slabs need expansion joints?

Expansion joints are virtually never needed with interior slabs, because the concrete doesn't expand that much—it never gets that hot. Expansion joints in concrete pavement are also seldom needed, since the contraction joints open enough (from drying shrinkage) to account for temperature expansion.

Mike Christensen

Professional

Do I need control joints in concrete slab?

Joints should be sawed as soon as the concrete will withstand the energy of sawing without raveling or dislodging aggregate particles. ... Contraction/control joints must be established to a depth of ¼ the slab thickness (Figure 2). Proper joint spacing and depth are essential to effective control of random cracking.

René Link

Professional

How big of a concrete slab Can I pour myself?

400 square feet would be a tall order for one person especially if you haven't placed and finished a slab before. A 20x20x4" slab would take 5 cy, which weighs about 10 tons. Even of you place by chute, that's a lot of material to move, not to mention the difficulty of screeding a floor with one person.

German Attanasio

User

How thick is the concrete on a tennis court?

100mmConcrete tennis courts technology has changed dramatically whereby the numerous expansion joints are not necessary. Depending on site conditions the normal slab is 100mm thick reinforced with F72 mesh. The strength of the concrete is 25mpa.

lonesomeday

User

Can you pour concrete against concrete?

Run a bead of concrete epoxy on the face of the edge of the first concrete slab, above and below the dowels. Cut your expansion joint material with a box cutter so you can press two strips onto the concrete (above and below the dowels) the entire length of the edge. You are now ready to pour your slab.

Tomasz Nurkiewicz

User

How do I stop my concrete sinking?

How can I prevent my concrete from sinking?Seal all open cracks and joints with a polyurethane or silicone caulk. ... Make sure downspouts are discharging at least five feet away from any concrete slab – the farther the better.More items...•Dec 21, 2018

Fredrik Mörk

User

What is the best concrete joint filler?

Akonaflex™ Expansion Joint Filler is a superior-grade, one-component, urethane sealant and filler to be used in concrete joints as well as a wide variety of substrates.

Drew Noakes

User

What to fill concrete joints with?

Foam backer rods act to fill in space between concrete joints so you don't need to use a ton of self-leveling sealant. Here's a BIG TIP: the diameter of the backer rod should be 1/8 inch larger than the width of your concrete expansion joint. This will ensure a water-tight seal.

Pierre

Guest

How much do concrete overlays cost?

The price of concrete overlay can be anywhere from $25 to $150 per square metre. This is a wide range of prices. There is a big difference between doing a complete concrete resurfacing and just a light overlay for decorative purposes.

AmrDeveloper

Guest

Is ICF better than concrete block?

ICF walls are monolithic, concrete walls without joints, and are significantly stronger than those built with concrete blocks.

...

ICF walls are very strong and can be engineered to bear substantially greater loads than concrete block walls both vertical and horizontal..

Lucas Gabriel Sánchez

Guest

What do you use to fill concrete expansion joints?

Foam backer rods act to fill in space between concrete joints so you don't need to use a ton of self-leveling sealant. Here's a BIG TIP: the diameter of the backer rod should be 1/8 inch larger than the width of your concrete expansion joint.

refactor

Guest

How much insulation do I need under a concrete floor?

A 50mm thick layer of proprietary floor slab insulation is usually enough to reach and maintain the target U value but this should be checked with an architect first. Insulation sheets should be laid tightly together with the joints staggered to avoid movement.

Ulysse BN

Guest

Should I seal concrete joints?

Stopping water from flowing under your concrete is probably the most important thing you can do to keep your driveway from sinking and becoming out of level. Caulking the joints and cracks is the best way to stop this from happening. Even expansion joints in your concrete driveway should be caulked.

Juanjo Conti

Guest

Should you fill concrete expansion joints?

Just remember that expansion joints should always be sealed and filled with a flexible joint sealer and never be epoxied or coated over. Contraction joints can be filled in the same manner after a coating or sealer is applied.

GSto

Guest

Do I need to cut concrete slab?

WHEN TO CUT CONTROL JOINTS In hot weather, concrete might crack if joints are not cut within 6-12 hours after finishing concrete. In this condition, if you don't want to use a grooving tool to cut joints, there are early-entry dry-cut lightweight saws that can be used almost immediately after finishing.

Siddharth

Guest

When should I cut my concrete slab?

Joints should be sawed as soon as the concrete will withstand the energy of sawing without raveling or dislodging aggregate particles. For most concrete mixtures, this means sawing should be completed within the first six to 18 hours and never delayed more than 24 hours.

Aaron Lelevier

Guest

How far apart should expansion joints be in concrete sidewalk?

Joints are commonly spaced at distances equal to 24 to 30 times the slab thickness. Joint spacing that is greater than 15 feet require the use of load transfer devices (dowels or diamond plates). Contraction joints may be tooled into the concrete surface at the time of placement.

Phil

Guest

Why is my concrete cracking?

When concrete expands, it pushes against anything in its way (a brick wall or adjacent slab for example). When neither has the ability to flex, the expanding force can be enough to cause concrete to crack. Expansion joints are used as a point of separation (or isolation), between other static surfaces.

bobince

Guest

Can you use wire mesh in concrete slab?

YES When long joint spacing is required or when joints are unacceptable in floor use. Although short joint spacings alleviate the need for reinforcement, wire mesh will allow for increased distance between joints if correctly placed in the upper portion of the slab, at least two inches below the surface.

Hoque MD Zahidul

Guest

How big can a concrete slab be?

Some specifers limit the single-placement area of concrete slabs-on-ground to 2,000 to 5,000 square feet, but specifications sometimes place a very stringent single-placement limit of 900 square feet (a 30x30-foot panel).

MaxU

Guest

How do you cut concrete expansion joints?

The thumb rule used to determine the depth of the control joint is to cut the joints one-quarter to one-third the slab thickness. If the concrete slab laid is 150mm thick, the depth of the joint must be 40mm to 50mm. If the joint is too deep, aggregate interlocking will not be sufficient to transfer loads.

harpo

Guest

Should I caulk my concrete expansion joints?

Caulking Concrete Cracks and Expansion Joints Caulking the joints and cracks is the best way to stop this from happening. Even expansion joints in your concrete driveway should be caulked. They can be the biggest culprit of water under your slabs.

Florin Dobre

Guest

Can a concrete structure be completely free of expansion joints & contraction joints?

Consider that the concrete structure is not subject to the problem of differential settlement. For contraction joints, it may be possible to design a concrete structure without any contraction joints. ... Therefore, the structure has to be designed to take up these thermal stresses if expansion joints are not provided.

David C. Rankin

Guest

Can you fill concrete expansion joints with sand?

Can I fill concrete expansion joints with sand? Yes, you may use sand as a filling material before finishing it off with epoxy coating. The best type of sand to use is silica sand. Silica sand is an excellent extender for epoxy-based compounds and sealants.

Hakan Fıstık

Guest

Can you guarantee concrete from cracking?

Expansion joints are used as a point of separation (or isolation), between other static surfaces. Typically made of a compressible material like asphalt, rubber, or lumber, expansion joints must act as shock absorbers to relieve the stress that expansion puts on concrete and prevent cracking.

Elad

Guest

Should you caulk concrete saw cuts?

Control joints or saw cuts should be addressed the same as above. The control joint can be filled with backer rod or even sand. Filling the saw cut is mandatory as control joints are 1/4 the thickness of the concrete. On a 4″ slab, that is a 1″ deep saw cut and nobody want to use that much caulking.

Arthur Rubens

Guest

Can you pour concrete a little at a time?

The thing with larger slabs is that they usually require the entire amount of required concrete at one time. If you don't pour the whole thing at once, you get cold joints. Cold joints happen when concrete poured into a slab is allowed to partially or completely dry before more concrete is added.

Paul Sonier

Guest

Do I need expansion joints in a concrete slab?

All concrete will shrink slightly as it dries and, when it's set, will expand or contract depending on the ambient temperature. To prevent cracks from forming, concrete expansion joints should be incorporated to allow for movement, particularly in slabs with a surface area exceeding 6m2.

cassiomolin

Guest

Do I need to fill concrete expansion joints?

The key is to use the proper sealer or filler depending on the intended purpose and what type of joint it is. Just remember that expansion joints should always be sealed and filled with a flexible joint sealer and never be epoxied or coated over.

aefxx

Guest

Do you need expansion joints in concrete driveway?

Every concrete slab, inside (basements, garages, etc.) or outside (driveways, patios, entries, etc.) are required to have joints every eight feet horizontally and vertically. Expansion Joints provide space between concrete slabs as a buffer for expansion on hot days and contraction when it is cold.

Yahya

Guest

Can I put cement between pavers?

Mortar or Concrete Mix A 4- to 6-inch-thick concrete slab is suitable as a base for pavers, which can be laid directly onto the wet concrete so they are held in place when it dries.

...

Mortar also can be used in the joints between pavers, just like grout is used between tiles..

SiddAjmera

Guest

Can you put concrete between pavers?

Mortar or Concrete Mix A 4- to 6-inch-thick concrete slab is suitable as a base for pavers, which can be laid directly onto the wet concrete so they are held in place when it dries. ... Mortar also can be used in the joints between pavers, just like grout is used between tiles.

manojlds

Guest

How do I keep my concrete slab from cracking?

4 WAYS TO PREVENT CRACKED CONCRETEStart with a sound subgrade. Make sure the subgrade is compacted. ... Modify the concrete mix. Use a low water-to-cement ratio. ... Install joints. Be active in deciding where control joints will be placed. ... Properly cure the concrete. Properly curing concrete slabs: Why and how to cure.

Shai

Guest

Will concrete crack without rebar?

Really depends on what the slab is used for but in general no you can install wire mesh or use fibered concrete. However you do need something to tie the concrete it just doesn't have to be rebar. You do not need rebar for any slab if you make it thick enough and space the joints properly. ... Any concrete slab can crack.

Jeremy

Guest

How can Cracks in concrete be avoided?

4 WAYS TO PREVENT CRACKED CONCRETEStart with a sound subgrade. Make sure the subgrade is compacted. ... Modify the concrete mix. Use a low water-to-cement ratio. ... Install joints. Be active in deciding where control joints will be placed. ... Properly cure the concrete. Properly curing concrete slabs: Why and how to cure.

UMAR-MOBITSOLUTIONS

Guest

What to use to fill concrete joints?

Foam backer rods act to fill in space between concrete joints so you don't need to use a ton of self-leveling sealant.

Here's a BIG TIP: the diameter of the backer rod should be 1/8 inch larger than the width of your concrete expansion joint..

cassiomolin

Guest

Will fire cement set without heat?

Fire Cement is a ready-to-use putty which is heat resistant up to 1250oc. The expansion and contraction of your metal stove as it heats up and cools down will inevitably crack any fire cement around joints on the flue and stove pipe. ...

DIGI Byte

Guest

How do you reseal concrete expansion joints?

After removing all the old sealant use a vacuum or wet/dry vac to suck up any debris from your concrete joints. Then use a closed cell foam backer rod in between the joints. Foam backer rods act to fill in space between concrete joints so you don't need to use a ton of self-leveling sealant.

David East

Guest

How do you smooth out a concrete garage floor?

Mix some resurfacer to a mashed potato-like consistency and push the mix into the cracks. Smooth it with a cement trowel flush with the surrounding surface (Photo 4). If you have expansion joints cut into the existing slab, push a weather strip into the joint.

Elad

Guest

Should I seal concrete expansion joints?

Expansion joints must be sealed with a flexible sealant, like QUIKRETE® Self-Leveling Polyurethane Sealant or QUIKRETE® Non-Sag Polyurethane Sealant…or an expansion joint strip, to prevent water from penetrating the joint and deteriorating the sub-base.

Skizz

Guest

Should you caulk concrete expansion joints?

Even expansion joints in your concrete driveway should be caulked. They can be the biggest culprit of water under your slabs. Notice how the caulking is slightly lower than the concrete slab around it. This protects the caulk from wear and tear of people walking and driving over it.