Recipe For Concrete Countertop Mix. Mixing the concrete is a labor intensive job which requires constant vigilance. Whether you use a bagged mix specifically designed for concrete countertops, or mix your own, mix design is critical for concrete countertops.
Do a sample first, don't just jump right in and do your countertop. Below is a mix design for rapid hardening GFRC applications using Calcium Sulfoaluminate Cements (CSA). Work quickly to fill the rest of the form halfway.
If you use enough additives it will be a stable standalone countertop mix.
Work quickly to fill the rest of the form halfway.
Jeff Girard, president of The Concrete Countertop Institute, teaches his students to make an aggregate-based mix and sand-based mix. You'll start by adding concrete board to the base of the countertop. Unlike sidewalks or foundations which are slabs on grade, concrete countertops are generally long, slender, thin beams that not only behave very.