When Should expansion joints be used?

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 is the need for expansion joint in precast structures?

Expansion joints are placed in concrete to prevent expansive cracks formed due to temperature change.

Where do you need expansion joints?

Expansion joints occur through all parts of a structure to provide complete separation – through floors, walls, ceilings, and roofs (interior & exterior).

What are expansion joints and why are they necessary?

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.

Do you need expansion joints in concrete path?

A.: According to several industry sources, expansion joints, even at 50-foot intervals, are not necessary for the sidewalk project. Long stretches of concrete do not require intermediate expansion joints.

What is the difference between control joint and expansion joint?

In building materials, a control joint is used to control cracking while an expansion joint is designed to handle structural movement. A control joint can be formed during placement of the building material or cut after the material is placed.

Why provision for expansion joint is necessary in long building?

The primary reason to provide expansion joint is to allow for the thermal movement of the building between this joint so that energy due to thermal stresses are dissipated in this gap thereby avoiding cracks occurring in the building.

Why are expansion joints used in buildings?

What are expansion joints used for? Expansions joints can efficiently absorb vibration, hold parts of construction materials together, and allow material’s movement due to ground settlement or earthquakes. They also ensure easy movement of live loads in addition to isolation from moisture and water.

Why expansion joints are provided in buildings?

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.

Why are joints necessary in concrete structures?

Joints allow one concrete element to move independently of other parts of the building or structure. Joints also let concrete shrink as it dries—preventing what’s called internal restraint. Internal restraint is created when one part of a slab shrinks more than another, or shrinks in a different direction.