CONCRETE MIX DESIGN RECIPES:
Mix design and recipe formulas are offered here by Expressions LTD as a reference. Expressions LTD is not liable for any results obtained by following mix designs outlined below. Mixes should be tested, and adjusted if desired, at each fabricator's discretion. 


Make sure to check out our 40oz. Mixing Cups (sold here), very useful for all stages of mixing and dosing concrete, additives, and color- in addition to mixing the concrete sealers.

Standard Expressions Concrete Countertop Mix: @6,000 psi

 Start with the basic bag mix: 60 lb. bag mix 80 lb. bag mix
Coverage/Yield @ 1.5" Thickness 3.6 sq. ft. 4.8 sq. ft.
Coverage/Yield @ 2" Thickness 2.7 sq. ft. 3.6 sq. ft.
Add this stuff:
Extra Portland Cement (Type I/II) 4 lbs. 5 lbs.
SP 7000 Plasticizer/Water Reducer (sold here) .75 oz. (1.5 Tablespoons) 1 oz. (2 Tablespoons)
Chopped AR Glass Fibers (sold here) 1.5 oz. (0.1 lbs) 2 oz. (0.125 lbs)
  • Use the basic bag of standard concrete mix from your local hardware store (don't pay the extra for '5000' or 'Countertop' brand concrete mix).  You will also want to get extra straight Portland Type I/II cement from your hardware store.
  • Combine concrete mix with extra Portland Cement. In clean 5-gallon bucket, add about 2 quarts of clean water, and mix in the SP 7000 Plasticizer/Water Reducer. Combine this mix water with the concrete, and begin mixing. Add small amounts of additional water** until concrete mix resembles that of thick oatmeal.  Sprinkle Chopped AR Glass Fibers into mixing concrete and mix an extra few minutes. 
    • **Some applications may require a drier concrete mix (such as pressing very dry concrete into a form with the goal of creating large voids- to be filled later with a different colored cement slurry), or a wetter mix (filling a vessel sink 2-part sink mold), so adjust the water accordingly.
  • Costs: Material costs for Concrete Mix, Portland Cement, AR Fibers, and SP 7000 Plasticizer is @$0.95 per sq. ft. at 1.5" thickness, $1.30 per sq. ft. at 2" thickness.

Ultimate Expressions Concrete Countertop Mix:  @7,500 psi
Start with the basic bag mix: 60 lb. bag mix 80 lb. bag mix
Coverage/Yield @ 1.5" Thickness 3.6 sq. ft. 4.8 sq. ft.
Coverage/Yield @ 2" Thickness 2.7 sq. ft. 3.6 sq. ft.
Add this stuff:
Extra Portland Cement (Type I/II)* 8 lbs. 10 lbs.
SP 7000 Plasticizer/Water Reducer (sold here) .9 oz. (1.75 Tablespoons) 1.25 oz. (2.5 Tablespoons)
Chopped AR Glass Fibers (sold here) 1.75 oz. (0.11 lbs) 2.25 oz. (0.14 lbs)
PolyPlex Acrylic Polymer (sold here) 1.75 lbs. 2 lbs.
  • Use the basic bag of standard concrete mix from your local hardware store (don't pay the extra for '5000' or 'Countertop' brand concrete mix).  You will also want to get extra straight Portland Type I/II cement from your hardware store.
  • Combine concrete mix with extra Portland Cement*.
    • *Some may wish to add a pozzlan in place of some cement to claim the concrete is 'green' and has less of a carbon footprint.  VCAS (Vitro Minerals, sold here) can be added in place of up to 25% of the cement, which would mean adding 5 lbs. VCAS and 3 lbs. Portland Cement to the 60 lb. mix, or adding 6 lbs. VCAS and 4 lbs. Portland Cement to the 80 lb. mix)
  • In clean 5-gallon bucket, add about 2 quarts of clean water, and mix in the SP 7000 Plasticizer/Water Reducer and the PolyPlex Acrylic Polymer. Combine this mix water with the concrete, and begin mixing. Add small amounts of additional water** until concrete mix resembles that of thick oatmeal.  Sprinkle Chopped AR Glass Fibers into mixing concrete and mix an extra few minutes. 
    • **Some applications may require a drier concrete mix (such as pressing very dry concrete into a form with the goal of creating large voids- to be filled later with a different colored cement slurry), or a wetter mix (filling a vessel sink 2-part sink mold), so adjust the water accordingly.
  • Costs: Average material costs for Concrete Mix, Portland Cement, AR Fibers, SP 7000 Plasticizer, and Polyplex @$2.75 per sq. ft. at 1.5" thickness, $3.65 per sq. ft. at 2" thickness.

From Scratch Countertop Mix: @6,000-7,500+ psi
  • 25 lbs. Portland Cement (Try to use Type I instead of Type I/II for pre-cast)
    • This recipe is good if you want to use White Portland Cement for your mix.
  • 60 lbs of sand/pea gravel. Make sure it's washed so there is no dirt or fine dust. It's okay for the sand to be damp when weighing it. A good starting point is 40 lbs. sand 20 lbs. pea gravel.
    • Consider using quartz sand (it's white) if using White Portland Cement, to help the concrete piece be as white as possible.
  • 2 oz. AR Glass Fibers (about a golf-ball sized portion) - SOLD HERE
  • 2 Tablespoons SP 7000 Superplasticizer/Water Reducer - SOLD HERE
    • Optional: (For a stronger, better concrete) Add 2 lbs. Polyplex with mix water prior to combining with concrete. - SOLD HERE
  • MIX: Combine sand/gravel in mixer and let mix a few minutes. Add in Portland Cement.  In clean 5-gallon bucket, add about 2 quarts of clean water and 2 Tablespoons of SP 7000 Superplasticizer (and add the 2 lbs. of Polyplex if used). Combine mix water with concrete, and begin mixing. Add small amounts of additional water** until concrete mix resembles that of thick oatmeal. Sprinkle Chopped AR Glass Fibers into mixing concrete and mix an extra few minutes. 
    • **Some applications may require a drier concrete mix (such as pressing very dry concrete into a form with the goal of creating large voids- to be filled later with a different colored cement slurry), or a wetter mix (filling a vessel sink 2-part sink mold), so adjust the water accordingly.
  • Coverage: At 1.5" thickness, it will yield roughly 4.8 square feet. At 2" thickness, it will yield roughly 3.6 square feet.
  • Costs: Average material costs for Portland Cement, Sand/Pea Gravel, AR Fibers, SP 7000 Plasticizer @$0.80 per sq. ft. at 1.5" thickness, $1.00 per sq. ft. at 2" thickness.
    • Notes: Most Portland Cement bags are 94 lbs. Sand and Gravel can be purchased at a hardware store, already bagged, for a premium price. The more economical way to get sand/gravel is to get it from a gravel pit, or often times a concrete plant (the guys with the concrete trucks driving around) will let you come buy some very cheap, or give it to you at no cost for small amounts.