How to design a concrete countertop mix

When a concrete countertop is being designed the concrete countertop mix design is critical to the final outcome of the element.  A countertop mix should allow for quick curing, little to no shrinkage, anti fracture properties, high PSI and flexural strength, flowability, light weight, along with a light base color for a wider variety of color choices.  

Typical concrete is purely cement, sand (aggregate), and water and does very little of the above on its own.

Here is a list od potential additives you might find in a professional grade concrete countertop mix.

Chemical additives found in concrete countertop mixes include:

• Water reducers which help reduce shrinkage and increase strength.
• Plasticisers are used to improve workability and flowability
• Light weight aggregate to lighten the final elements overall weight
• Wire meshing, fibers, and/or rebar to provide flexural strength
• Polymers to improve flexural strength and PSI
• White base cement to provide a lighter colored base material

The proper ratios and mix design will ensure a top quality durable concrete countertop or element.