We recommend using the new and improved TEC 10 GFRC Admix! If you have questions about switching to TEC 10, give us a call! 321-978-1050.
Trinic GFRC Admix – Multi Component Admixture
Multi component powdered admixture for the production of ultra high performance GFRC, RPC, and ECC Concrete
Trinic GFRC Admix takes the hassle out of making ultra high performance Glass Fiber Reinforced Concrete, Reactive Powder Concrete, and Engeineered Cementitiuos Composite Concrete. Its easy to understand and dose, simplifying what can become an overly complicated process.
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- Multi component powdered admixture simplifies the production of GFRC, RPC, and ECC, no more mixing and matching several different admixtures at different dosage rates to produce high performance GFRC, RPC, and ECC.
- Very easy to dose, less chance for human error with a cost of about $1.50 / sq. ft. (3/4″ GFRC)
- Eliminates the overnight shipping costs, foaming, and moldy product problems associated with liquid polymers.
- Contains a high quality UV stable micro polymer specifically designed for GFRC production, eliminates the need for a 7 day wet cure.
- Anti-foaming agents eliminate pinholes.
- Dispersing and wetting agents improve color dispersion, intensity, and stability resulting in better color “pop”.
- Contains specialized additives for water reduction.
- Anti-shrink agents eliminate surface crazing, bowing, and curling.
- Closes the internal capillaries within the GFRC matrix leading to a denser, more acid and stain resistant concrete.
- Mixes faster than traditional GFRC, less cement clumps, more homogeneous mixes even with less than ideal mixers.
Factors affecting Trinic GFRC Admix dosage:
With some understanding and a little experimentation you can produce GFRC that is super high performance and virtually free from pinholes, crazing, bowing, and curling. You will be able to spray verticals or make self consolidating GFRC just by varying the dosage of admixture.
- Cement type – Different cement types will have different water demands to reach the same slump. Not just white or grey but cement from different mills will react differently.
- Sand – The size of the sand grain and the sand type both have an effect on slump. Generally the finer the sand the higher the water demand.
Calculating you water to cement ratio:
- The water to cement ratio is the total water divided by the total cementitious content.
- The water in the sand or the absorption factor of the sand must be accounted for in order to calculate and accurate water to cement ratio.
- Extremely wet sand can contain up to 10% moisture.
- Dry sand can absorb up to about 1.5% of its weight in water. This is known as satisfying the sand’s absorption factor.
- The sand absorption is largely responsible for the false set you may experience.
- Example with dry sand:
- 30 pounds sand, 30 pound cement how much water gives you a .3 w/c ratio?
- 30 pounds cement * .3 = 9 lbs water.
- 30 pounds sand with an absorption factor of 1.5 = .45 lbs. of additional water to satisfy the sand’s absorption.
- Adjusted water to achieve a .3 w/c ratio = 9.45 lbs.
GFRC mix ½ cf.
- This is enough to produce 8 sq. ft. of GFRC ¾” thick. The back coat is just face coat with glass fiber dosed in the range of 2% to 4% of the
total dry weight of the batch. We use 3% for most applications.
Portland Cement – 30 lbs.
- We recommend white Portland. Different cements will react slightly differently to Trinic admixtures.
- You can replace part of your Portland cement with a pozzolan to make greener GFRC, we recommend bright white silica fume from Trinic.
- Always make a test batch prior to production runs.
Sand- 30 lbs
- Sand graded anywhere from 30 grit (fairly course) to 70 grit (very fine) can be used for GFRC.
- We recommend starting with a 40 grit sand for facecoats and backcoats.
- The finer the sand the higher the water demand.
- You may need to offset thirsty fine sand with additional Trinic plasticizer.
Water – 9 lbs. or 1.08 gallons
- This will give you a water to cement ratio of .3 which is a very good starting point. If you use a little more water that’s ok, if you use less
water great, if it looks like you need a more flowing mix on a flat surface, add more Trinic plasticizer rather than water.
- You can add up to an additional 1 % (of the cement weight) of Trinic plasticizer to make a self consolidating GFRC mix, start with .25% and work up from there as required.
Trinic GFRC Admix – 3% of the cementitious as a starting point up to 4% if needed
- 3% of 30 lbs. =.9 lbs.
Our Suggested Facecoat/ Sprayable Mix Design:
The basics of GFRC
Self Consolidating Face and Back Coat
Tips on Spraying a Vertical Facecoat and Forming
Making a Vanity with Inlayed Rocks