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Level on ground structure. Explanation:Slab-on-grade Slab is the concrete (or other material) platform placed as base for construction. On-grade means right on the ground. So slab-on-ground means that the building has a concrete (or other material) slab or platform placed right on ground soil.
On the technical drawings, reinforced concrete slabs are often abbreviated to r.c.slab or simply r.c.. In situ concrete slabs are built on the building site using formwork-a type of boxing into which the wet concrete is poured. If the slab is to be reinforced, the rebars are positioned within the formwork before the concrete is poured in. Plastic tipped metal, or plastic bar chairs are used to hold the rebar away from the bottom and sides of the form-work, so that when the concrete sets it completely envelops the reinforcement.