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Floor Joint Repairs in Concrete Floors

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Floor Joint Repairs in Concrete Floors

MOVEMENT JOINT REPAIRS IN INDUSTRIAL CONCRETE FLOORS & EXTERNAL HARD STANDINGS

Floor joints in industrial concrete floors can often be damaged over time.  Heavy trafficking across movement joints by HGVs, van, forklift trucks and especially any nylon-wheeled trolleys or machinery will eventually weaken the arrises / corners of the concrete floor slabs, which abut either side of the joint, causing them to crack, shear and break-off or crumble.  It is easy to carryout strong long-term repairs that will last as long as the correct preparation is carried out.  It is imperative that the damaged concrete slab edges are cut back to ensure that the repair is being applied to a sound undamaged surface.  If not the newly repaired arris will only be as strong as the damaged surface and will simply crack and break off when the damaged surface fails.  Any existing flexible joint material and backing rods will also need to be completely removed then replaced with new once the concrete floor slab edges have been repaired.

DIAGRAM: Industrial concrete floor movement joint repair

Choosing the right material for a movement joint in a concrete floor

Although movement joints in floors and facades are often described as expansion joints they do in fact have to deal with the contraction of construction materials as well as expansion.  The correct material will depend upon a number of factors:

  • The width of the movement joint under normal conditions
  • The predicted / design tolerances of expansion and contraction of the construction materials / components either side of the movement joint, i.e. the width of the joint when materials have contracted the most (this will be the widest width the joint is designed to be), and the width of the joint when the materials have expanded the most (this will be the narrowest width the joint is designed to be).
  • The type of traffic that the joint will be subjected to, i.e. the weight, frequency, vehicle type and wheel types of the traffic that will go over the joint.
  • The age of the concrete floor.

A joint sealant with a high modulus will be required when there is a low amount of movement expected, as in the case of old floors.  A joint sealant of this type will be harder and more resistant to direct traffic.

A joint sealant with a low modulus will be required when there is high movement of the structure.  The sealant will be softer and will stretch further than a high modulus sealant.  They are generally not used in direct traffic situations.

SEE ALSO:

INDUSTRIAL JOINT SEALANTS for joint / slab edge repair mortars and industrial joint sealant products

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