Monolithic Slab-On-Grade

Published: October 7, 2019 | Last updated: July 5, 2023

What Does Monolithic Slab-On-Grade Mean?

Monolithic slab-on-grade refers to the slabs that directly rest on the ground surface and are poured all at once. The word monolithic is used to specify the manner in which the concrete is poured, i.e. all at once.

Monolithic slab-on-grade does not have any footings below it and itself acts as a footing. Slabs-on-grade can be used in places where the load-carrying capacity required is low or in loose soil and soils with varying compressibility.

These slabs also efficiently spread vertical loads over a large area.

Trenchlesspedia Explains Monolithic Slab-On-Grade

The construction of a monolithic-slab-on-grade foundation requires proper site preparation such as leveling, grading and concrete reinforcement.

In this type of slab, footings are not present and the slab itself acts as a footing. To cast a slab-on-grade, the earth is first excavated to the required depth and compacted. A layer of gravel and bitumen is first laid over which concrete is poured with or without reinforcement.

The thickness of the slab is more at the edges of the slab, with reinforcement rods provided to strengthen the edges. The slab is allowed to cure to prevent cracks.

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