When should you use expansion joints in concrete?

Expansion joints are put in place before the concrete is poured. Expansion joints are used to allow the slab to move and not put stress on whatever it abuts. These joint are placed where a slab meets a building, where a slab meets another slab, and where a pool deck meets the coping.

What are expansion joints used for?

Expansion Joints are a bellows type device. 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 are expansion joints required?

Pipe expansion joints are necessary in systems that convey high temperature substances such as steam or exhaust gases, or to absorb movement and vibration. A typical joint is a bellows of metal (most commonly stainless steel), plastic (such as PTFE), fabric (such as glass fibre) or an elastomer such as rubber.

Do I need an expansion joint in concrete slab?

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 happens if you don’t put expansion joints in concrete?

If you have a concrete floor in your commercial building, you know expansion joints are necessary to allow for the natural expansion and contraction that occurs from temperature changes. Without these joints, large cracks can travel across your floor, creating costly damage.

What do you put in 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.

Can you fill in 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.

What do you introduce the expansion joint?

In building construction, an expansion joint is a mid-structure separation designed to relieve stress on building materials caused by building movement. Building movement at expansion joints is primarily induced by: thermal expansion and contraction caused by temperature changes, sway caused by wind.

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.

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.

What should I put between two concrete slabs?

Fill the trenches on either side of the driveway with small, rounded pea gravel (the size of marbles or peas). Do the same for the gaps between the concrete slabs, but stop filling the gaps about 2 inches from the top of the slabs.

Should expansion joints be filled?

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