What is the purpose of filler board?
filler board is an expansion joint filler boards made of natural wood fibres soft boards impregnated with bitumen. It is suitable for forming joints in in-situ or precast concrete components, and to protect waterproof membranes against physical or mechanical damage.
What is Construction joint in concrete?
A construction joint is the interface between concrete placements intentionally created to facilitate construction. A cold joint is a joint or discontinuity resulting from a delay in placement of sufficient duration to preclude intermingling and bonding of the material, or where mortar or plaster rejoin or meet.
What is a concrete expansion joint?
What is a concrete expansion joint? 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 expansion joint in piping?
Expansion joints (bellows) Expansion joints are installed in a piping system to absorb vibration and shock. They also have advantages such as reducing the noise and compensate caused by misalignment. Special expansion joints can also be designed for thermal expansion in hot applications.
How many joints are in concrete?
In slabs, there are three types of joints: Isolation joints (also sometimes functioning as expansion joints) Construction joints (which can also function as contraction joints) Contraction joints (also sometimes called control joints)
How many types of concrete joints are there?
three typesThere are three types of joints: Contraction Joints, Construction Joints and Isolation joints. The most common are contraction joints which control cracks which are caused by restrained shrinkage, loads and other stresses.
What material is used for expansion joints?
Expansion Joints in Building/Construction The material used for expansion joint fillers include low viscosity epoxy resins, and cork and woods such as southern yellow pine, redwood, or western cedar.
Why do we need expansion joints?
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.
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.
Where are expansion joints used?
The expansion joints are normally located between sections of bridges, paving slabs, railway tracks, and piping systems. The expansion joints are incorporated to endure the stresses. An expansion joint is simply a disconnection between segments of the same materials.
How many types of bellows are there?
There are three main types of metal bellows: formed, welded and electroformed. Formed bellows are produced by reworking tubes, normally produced by deep drawing, with a variety of processes, including cold forming (rolling), and hydroforming. They are also called convoluted bellows or sylphons.
Which is the most common joint in piping?
Threaded joints are used from 6 mm diameter to 300 mm diameter pipes. It is one of the most common methods of joining pipes used in large infrastructure like commercial, institutional and industrial systems.
What is contraction joint and construction joint?
Both isolation and construction joints are formed before the concrete is poured; contraction joints (or control joints) are "placed" in the fresh concrete before it has a chance to create its own joints—also known as cracks.
What is difference between construction joint and expansion joint?
A construction joint occurs when there are multiple concrete placements. An expansion joint is used in concrete and steel. It can occur between different days of concrete placements. An expansion joint allows the concrete or steel to expand or contract with daily temperature variations.
Where is construction joint in slab?
Construction joints parallel to the slab span can be placed anywhere, except those locations in T-beam construction that rely on a portion of the slab to act with the beam in resisting flexure. For slabs and beams it is, therefore, usual to have construction joints at mid span of the middle third of the span.
How are construction joints formed?
Construction The joints are usually constructed by sawing a groove to at least a quarter of the depth of the slab. Reinforcement should be terminated at least 50 mm, preferably 75 mm, from the joint location.