Title: Joint Free Slabs On Grade:An Innovative Approach: Working With Concrete Instead of Wrestling With It

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Publication: CIA

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Date: 2/13/2011

Abstract:
The Crack Induced Joint Free Slab is the traditional raft slab with integral edge and internal footings, extended to potentially limitless areas with the installation of a crack inducer grid made up of set lengths of extruded conduit and injection moulded junction / reinforcement chair units. The concrete setting and drying shrinkage stress is dissipated throughout the deliberately restrained slab by means of the regular closely spaced crack induction grid laid on the vapour barrier (where required) on the subgrade. The crack inducers are in effect .saw cuts. installed from the underside of the slab, .cut in. as the concrete is placed. The method generally eliminates the need for all of the traditional isolation and formed and sawn control joints, together with their associated treatment, sealants, and maintenance.