FREE! How to Make GFRC: A Step by Step Process (with Mix Design)
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Step by Step GFRC with Mix Design
A message from Jeff Girard:
"Do you understand the latest technologies for producing high-quality, high-performance, lightweight concrete countertops? Do you know how glass-fiber reinforced concrete (GFRC) countertops compare to traditional cast-in-place and precast technologies?
Get the answers in this seminar. I will teach you how to create amazing GFRC projects, give you a from-scratch mix design and explain how to make your GFRC strong and reliable."
You will learn:
- The biggest mistake almost everyone in the industry is making that compromises strength and risks failure. You won't make that mistake!
- A detailed, step by step procedure including tips for spraying mist coat, the trickiest skill to master.
- A cost-conscious, from-scratch mix design that really works
- Exactly which tools and materials you really need, all non-proprietary and at the best prices.
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Q & A
FREE! How to Make GFRC: A Step by Step Process (with Mix Design)
Pozzolans are not needed in GFRC, but pozzolans do improve physical characteristics like strength. More information about pozzolans and why they are used can be found here:
https://concretecountertopinstitute.com/free-training/the-use-of-pozzolans-in-concrete/
Cracking in the top layer can occur for a variety of very different reasons, so there's no one best way to prevent it. One way surface cracking can occur is from excessive flexing of the concrete. The only practical general solution is to prevent that from happening. Cracking can also occur because the mist coat dries out too much during casting. The common way to prevent this from happening is by working faster. In very dry environments it's acceptable to periodically lightly mist the freshly sprayed mist coat with a fine mist of water. This keeps the surface damp, but it must never be wet or collect water on the surface. Finally, cracking can also occur if a pozzolan is used at too high of a dose. I've only seen this with white silica fume, where the recommended dose (by the vendor) is too high. For this specific situation, a dose of 5% by total cementitious weight will not create cracking, but higher doses will.
Polymer is an admixture, and like all admixtures, it is dosed based on the total cementitious weight in the concrete. Only fibers, which are not admixtures, are dosed based on the total wet weight of all the ingredients, including the fibers. In other words, a 100 kg batch of GFRC contains 3 kg of alkaline-resistant glass fibers in it.
Reviews
FREE! How to Make GFRC: A Step by Step Process (with Mix Design)
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As an enthusiastic DIYer trying to move to the next level, these free instructions are super helpful. I’m proud to know this much about GFRC, primarily from Jeff and the rest of CCI. Working on your own countertops is still an investment of time, money, and sweat and these instructions help prevent a lot of mistakes. After completing my own projects, I think I’d be ready to take the next step and start working on a project for a client.
No other free training compares to this.
Thanks CCI!
I have been trying to learn more about GFRC ever since I can up with a project in mind. I really appreciated the detailed info. I feel the final product is always better when one knows not only the how but the why something is done.
Great seminar that really teaches the correct steps
Great online course, I’ve been learning so much from the concrete countertop institute and I’m beyond excited to keep practicing!