Construction Joint and its Types

Construction Joint In Concrete | Types of Construction Joints | Concrete Contraction Joint | Expansion joints

What Is Construction Joint?

The Construction Joint in concrete used to prevent any crack during its life period. Concrete has the property of expansion and contraction due to temperature changes, which is resulting in a change in the volume of concrete. This change in the volume of concrete can be a cause of concrete cracking. Therefore, to prevent concrete crack construction joints are provided in concrete.

Construction Joints in Concrete
Construction Joints in Concrete

Construction joint is essential if the size or length of concrete members exceeds some specified limit.

Generally for short-length concrete member construction joints are not required, because for expansion and contraction of concrete there is the end of concrete is too close. But when the length of the concrete member has exceeded a certain limit there is no endpoint where this volume change can take place.

In such a case, the concrete member will crack.

Construction Joints
Construction Joints in Concrete

Types of Construction Joints In Concrete:

The following are the common concrete joint,

  1. Concrete Construction joints
  2. Expansion joints
  3. Contraction joints
  4. Isolation joints
  5. Decorative concrete joints

Read More: 8 Signs Of Bad Concrete Pour & Defects In Concrete


1. Concrete Construction Joints

Construction joints are generally placed in the concrete slab to determine the extent of the individual placements. It is generally in conformity with a predetermined joint layout.

Construction joints are designed in order to allow the displacement between each (both) side of the slab but, they also transfer the flexural stresses produced in the slab by the external loads at the same time.

Types of Construction Joint
Types of Construction Joint

Construction joints allow only the horizontal displacement which is right-angled to the joint surface that is normally caused by the thermal or shrinkage movement. Vertical or rotational displacement is not allowed by the joint at the same time.


2. Expansion Joints

Some time due to many reasons volume of the concrete is change. For these reasons, we provide the joint to relieve the stress. The building that length is more than 45m provided one or more expansion joints. In India, it recommended in the building that the c/c distance is 30m.

Expansion joint means a GAP is provided between the parts of the building.


3. Contraction Joints

Contraction Joint in Concrete
Contraction Joint in Concrete

Contraction joint which is made in the concrete slab with help of the sawed or it should be created or groove which creates a weakened vertical plane. Cracks in the slab due to the dimensional changes are resisting by the contraction joint.

Due to the unregulated cracks can grow or the water is infiltrated in the base, sub-base or subgrade of pavement creates other types of distress in the pavement.

It is the most common type of joint in pavements, so the term “joint” refers to a contraction joint. Contraction joints are defined by their spacing and their method of load transfer. In the slab, contraction is provided at the 1/4 – 1/3 the depth of the slab or typically spaced every 3.1 to 15m.

Read More: Cold Joint Concrete – Its Effect And Treatment Methods


4. Isolation joints

Isolation joint is used for a special purpose it completely isolates the slab from the wall or a column or drains pipes. The walls or the columns that have their own footing or deeper than the slab subgrade are not easily joint to move the same way as a slab does it shrinks or expands due to drying or temperature changes or as the subgrade compresses a little.

If the slab is connected to these types of walls or columns or the drain pipes as they contract or settle there will be resisted but the cracks shown on the slab.

Joint material is placing next to the column or wall or drains pipes for the formation of the isolation joint. The material used for the isolation joint is generally asphalt-impregnated fibreboard or plastic, croc, rubber, or neoprene. The isolation material should go all the way through the slab from start to end but not on the top surface.

At columns, in all four directions, the contraction joint is provided with an isolation joint ending. Generally shaped in a circular or a diamond-shaped column. Until the column is not carrying its full dead load does not install the isolation material around the column.


5. Decorative Concrete Joints

Decorative Concrete Joints
Decorative Concrete Joints

In decorative concrete construction of joints is requires a little more planning and execution. The decorative stamping is not sunk deep in the concrete slab because the stability of the slab is needed.

The joints are generally penetrated 1/4th of the surface. So, the cracks are carefully controlled. We just need to cut the concrete along with the pattern of the stamped design so the joints are not visible from the surface.


FAQs: Construction Joint

Construction Joint In Concrete

The Construction Joint in concrete used to prevent any crack during its life period. Concrete has the property of expansion and contraction due to temperature changes, which is resulting in a change in the volume of concrete. This change in the volume of concrete can be the cause of concrete cracking. Therefore, to prevent concrete crack construction joints are provided in concrete.

Concrete Construction Joint

Construction joints are generally placed in the concrete slab to determine the extent of the individual placements. It is generally in conformity with a predetermined joint layout. These concrete joints are designed in order to allow the displacement between each (both) side of the slab but, they also transfer the flexural stresses produced in the slab by the external loads at the same time.

Types of Concrete Joints

Concrete Joints types are listed below,
1. Concrete Construction joints
2. Expansion joints
3. Contraction joints
4. Isolation joints
5. Decorative concrete joints

Expansion Joints in Concrete

Some time due to many reasons volume of the concrete changes. For these reasons, we provide the expansion joint to relieve the stress. The building that length is more than 45m provided one or more expansion joints. In India, it recommended in the building that the c/c distance is 30m.

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