The functions of different components of a typical expansion joint.
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Combined filler, dowel bar, PVC dowel sleeve, bond breaker tape, and swing.
Joint sealant: It seals the joint width and prevents water and dirt from entering the joint and
Dowel bar causes corrosion and unexpected joint tension resulting in resistance
Movement
Joint filler: It is compressible so that the joint can spread freely without any hindrance.
One may suspect that even without its presence, the joint can still spread freely. in fact,
Its presence is important because it serves the purpose of space occupation, though
Dirt and rubbish have been dumped in the joint, leaving no space for them to live.
Dowel Bar: This is an important part of the joint. It works to guide the direction
Solid expansion movement. Therefore, the wrong direction of the dowel bar space
It will attract joint pressure during thermal expansion. On the other hand, it connects
Two adjacent structures carrying more load than joints.
PVC Dual Sleeve: This helps in the movement of the dowel bar. On one side
Combined, the dowel bar is surrounded by concrete. PVC dowels, on the other hand, however
The sleeve is fastened directly to the concrete so that the dowel bar can move. One
Highways standard drawings may detail common extension joints
In this way, part of the PVC dual sleeve is extended to the other part of the joint
Where the dowel bar acts directly on the concrete. In this case, it appears that
Management prevents the movement of the joint. If that's the case, why should designers do it?
Deliberately arranged that? In fact, the reason behind it is to avoid water
Stay in touch with the dowel bar in case of joint sealant failure. Because PVC is flexible
Material, it only hinders the movement of the joint under this design.
Bond-breaking tape: Since the majority of the joint sealant is applied in liquid form during this time
Construction helps to stop the flow of sealant liquid inside the bond breaker tape
Combined
Cradle Bar: Helps to keep the dowel bar in position during construction
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