To design a concrete slab on grade, consider the following factors:
- Perform all essential calculations
The list is long, but essential calculations include the stationary live load; the minimum and required slab-on-grade thicknesses; the minimum and maximum lengths of the steel reinforced slab-on-grade floor; the flexural strength of concrete; the maximum wall load; the allowable deflection and many others.- Provide the base
The concrete slab needs a firm and stable base with a properly compacted subgrade, which needs to be determined and performed before the concrete is poured. Heavy traffic areas or areas on poor subsoil can result in cracking problems if the base is not built properly.- Determine the concrete mix
Determining the proper concrete mix design includes calculating the water-to-cement ratio, as well as the air-to-entrainment requirements.- Determine the support placement
The proper placement of support and positioning of wire reinforcement reduces the risk of cracking.- Determine spacing and curing
Proper placing and spacing of the control joints is essential for support, and proper cure time leads to stronger concrete than uncured concrete.
There are many important considerations for designing a concrete slab-on-grade, and the calculations are best left to a professional.
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