Length - 02:18 Proper preparation of the concrete subgrade is vital to the long term performance of the concrete slab. To prevent cracking and sinking of the slab, a plate compactor is used to compact the crushed run of aggregate base. This base is usually the thickness of the concrete slab. If the slab is four inches thick, the crushed aggregate base should be four inches thick as well. The aggregate should be sprayed with water and compacted with the vibratory plate compactor before the concrete is placed on top. Be sure to use proper safety equipment like steel toe boots, ear plugs, and eye protectors.
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