What is the purpose of expansion joint?

Expansion joints are used to absorb thermal expansion. They can also be used to absorb contraction in cryogenic lines and to reduce vibration in piping systems. Materials of construction for the bellows can be stainless steel or rubber or even a composite material.

Where expansion joints are provided?

Expansion joints are provided in slabs, pavements, buildings, bridges, sidewalks, railway tracks, piping systems, ships, and other structures.

What is expansion joint in concrete?

A concrete expansion joint – or control joint – is a gap which allows the concrete to expand and contract as/when the temperature changes. It forms a break between the concrete and other parts of a structure to allow movement without causing stress, which can lead to cracking.

What is the difference between a construction joint and an expansion joint?

A construction joint occurs when there are multiple concrete placements. An expansion joint is used in concrete and steel. An expansion joint allows the concrete or steel to expand or contract with daily temperature variations.

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Are expansion joints necessary?

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.

What are the types of expansion joints?

What are the different types of expansion joints?

• Single Expansion Joints.
• Hinged Expansion Joints.
• Gimbal Expansion Joints.
• Universal Expansion Joints.
• Elbow Pressure Balanced Expansion Joints.
• In-line Pressure Balanced Expansion Joints.
• Externally Pressurized Expansion Joints.
• Toroidal Expansion Joints.

How do you calculate expansion joints?

The total expansion change can be calculated as follows: Total expansion change in inches = (coefficient of thermal expansion ) x (maximum temperature range) x (length of run in inches). Example: Total expansion change = (3.38 x 10-5 in./in./°F) x (120˚F) x (90ft x 12in./ft) = 4.38 in.

Is expansion joint waterproof?

Proper waterproofing at vertical and horizontal expansions joints is critical to the long-term success of a waterproofing application. Apply the waterproofing manufacturers approved reinforced flashing material over the opening and up the vertical substrate.

How do you do expansion joints?

In case of masonry walls the vertical control joints ( expansion joints ) shall be provided from top of the wall to the top of the concrete foundations. The vertical control joint shall not be taken through the foundation concrete. Reinforcement shall not pass through the joint.

What material is used for expansion joints in concrete?

Minimize Concrete Cracking and Damage with Expansion Joints. ASPHALT EXPANSION JOINT is composed of a blend of asphalts, vegetable fibers, and mineral fillers formed under heat and pressure between two asphalt-saturated liners. It is waterproof, permanent, flexible, and self-sealing.

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What can I use for concrete expansion joints?

Sikaflex can be used to seal horizontal expansion joints. It’s a great product because it remains permanently flexible, dries quickly, sticks to anything, is self-leveling, and highly resistant to weather conditions. You should apply Sikaflex when the temperature is between 40F-100F.

How often are expansion joints needed?

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.

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.

What is the difference between contraction and expansion?

The increase in size of an object on heating is called expansion whereas the decrease in size of an object on cooling is called contraction.