Maddison Davis


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Maddison Davis

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Cold Joint Concrete

Concrete Cold joint refers to concrete’s weakest point due to an interruption in concreting operations.

Cold joint in Concrete occurs when concrete starts setting up before the next batch, so that they do not mix.

Sometimes the cold joint is caused by delays or accidental interruptions. Other times they are due to work stoppages at the end. However, they can also be caused by poor consolidation.

Also Read: Hempcrete Blocks

Concrete Cold Joint Effect

Concrete’s cold joints are one type. Concrete hardens when they form cold joints. These joints do not cause concrete to crack, but are merely seams that have no visible void structure. Cold joints are usually straight, close-joined, and bonded.

As with all concrete pours, there may be a small amount of concrete that isn’t fully compacted. These small cracks could lead to future crack development.

If the joint is compressed, cold joint concrete will not cause structural problems. When assessing a cold junction, however, it is important to consider the location of the cold joints, the structural function and aesthetics of the elements, as well as the aesthetics.

However, a cold joint may not be a weakness. Concrete placed prior to the vertical bar being inserted for attachment later is not a weakness.

It is important to have a solid joint in the area of concrete interruption.

Concrete placed before a roughened surface (unfinished), is more important to allow concrete to mechanically bond to it.

This cold joint is considered weak if there is no old concrete bar.

Also Read: What Is a Rafter

Concrete Cold Joint Treatment

However, if a cold joint develops from unavoidable causes, the following treatment is recommended:

1. Concrete is still plastic

a) Fresh concrete can be applied directly to the old surface if the concrete is sufficiently green that it can easily be removed by hand and vibrators are able to penetrate the surface with minimal effort. It is important to cover the old concrete with fresh concrete as soon as possible. The joint should also be thoroughly cleaned and vibrated.

2. Cold Joint Hardens a Bit

Concrete that has hardened more than plastic can be removed easily with a light handpick. The concrete surface will be thoroughly raked and any loose concrete removed without affecting the concrete below. The cold joint is covered with a thick mortar layer, 12mm in thickness. Next, the mortar layer is covered with fresh concrete. Finally, the joint is vibrated to penetrate the old concrete layer.

3. Cold Joint is Hardened

If the concrete is too stiff to remould or mortar or slurry doesn’t rise despite extensive vibration, it will be left to harden for 12-24 hours. After cutting the concrete to the required shape and preparing it for use, the joint is treated as a regular joint. Learn more about Concrete Joints

Concrete Cold Joint Repair

Avoiding cold joints in concrete is the best practice. Concrete can develop cold joints for unavoidable reasons. It is important to address any problems that may affect structural stability.

It should also be noted that cold joint repairs are more difficult than other types of concrete repair. These methods are worth mentioning.

To improve bonding, you could use a bonding agent.

Ground could be used to improve the joint’s workability. This would increase the likelihood of vibrating two layers together.

To increase the strength of the joint, you could add dowel bars.

You can make construction joints. It is sometimes a better option than a weak joint. Particularly in areas that will see tensile stress applied. Cold joints in concrete walls should be avoided as this could cause durability problems.

Concrete cold joints cracks can be repaired using conventional concrete crack repair methods like epoxy grout injection or another similar method.

Also Read: Well Points

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