Auxiliary or Additional Reinforcement is provided to mitigate cracking near a re-entrant corner i.e. where the corner points into the interior of the panel. Re-entrant corners are undesirable when choosing the joint layout for a concrete floor slab as they significantly increase the risk of cracking. However, sometimes they are unavoidable, due to the shape of the building, a protrusion into the panel from another element of the construction.

Auxiliary reinforcement can be set near the surface of the slab next to the corner. It prevents the cracks from opening far enough that they would become a problem and it stops them from propagating further into the slab.

For auxiliary reinforcement, we provide an even distribution of reinforcement as per TR 34th edition from the UK Concrete Society. We reinforce all re-entrant corners at columns, loading docks, and floor penetrations with 4Nos. 10mm diameter deformed high tensile bars, 1000mm long, fixed on spacers with 50mm top cover. We reinforce concrete floor slab by embedding deformed steel bars or welded wire fabric within freshly made concrete at the time of casting.