Fast, low cost floor joint repair
August 1st 2006

The specialist joint repair division of Concrete Grinding has successfully repaired the two main 24m transverse construction joints in a 2000m2 concrete floor slab, in a single weekend and at a much lower cost than alternative methods.

Uneven joints between the three sections of the floor slab in the warehouse run by furniture fittings distributor, Blum UK, were causing wire-guided man-up trucks to frequently malfunction. CG confirmed that localised sub-base compression relating to the failure of the load transfer system between the slabs was the fundamental cause.

Blum UK had considered carrying out major structural repairs to the slabs, which would have taken at least six weekends and been disruptive and expensive.

CG's solution was to stabilise the joint edges by pumping a high-strength resin foam into the void beneath them, cutting back the joint arrises to a depth of 50mm and then re-building the joints with a high-performance epoxy mortar. Finally, the joints were re-cut in the same position as before, filled with a semi-rigid compound, ground to ensure a completely even surface and sealed.

The whole contract was successfully completed in one weekend, which was much quicker, cheaper and less disruptive than the alternative procedure.

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