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Mix and Pour GFRC Hearth

16:14
22:04
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At 16:14 in

Concrete Look With Venetian Plaster. Not What I Expected!

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What happens here

Carefully weigh out all GFRC components according to the provided instructions from Fish Stone Concrete, including HP50 concrete mix, color pigment (black iron oxide), hardener, and water. Mix the pigment and hardener with the initial amount of water in a mixing tub using a drill with a paddle mixer. Gradually add the HP50 concrete mix while continuing to mix until a 'milkshake consistency' is achieved. Pour the face coat mixture into the prepared mold, ensuring an even layer of about 1/8 inch thickness. Use gloved hands to spread and work the mix into all corners, eliminating air bubbles. Let it set slightly. Then, mix the backer coat by adding glass fibers to the remaining GFRC mix. Pour the backer coat on top of the face coat, filling the mold to the desired thickness (e.g., 1.25 inches). Use gloved hands to consolidate the concrete, ensuring it fills all areas and embeds the fiber mesh, which is then placed into the wet concrete. Let the concrete cure for at least 4 days before demolding.

Goal: This step details the precise mixing of glass fiber reinforced concrete (GFRC) with pigment and hardeners, followed by pouring and consolidating the mixture into the prepared mold.

Tools and materials

  • Digital Scale
  • Drill with Paddle Mixer
  • Mixing Tubs
  • Respirator Mask
  • Rubber Gloves (Heavy-duty)
  • Safety Glasses
  • Black Iron Oxide Pigment
  • GFRC Hardener Fish Stone Concrete
  • Glass Fibers Fish Stone Concrete
  • HP50 Concrete Mix Fish Stone Concrete
  • Water

What they say

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making the edges not so sharp okay so I got my product you can just walk into a hardware store and buy all this stuff it's a specialty product so I got connected with fish Stone concrete I'll link them in the description below Tom from Illinois is a fantastic guy gave me all my instructions all my mixtures got my HP 50 concrete mix I have my hardener uh and I have the fiberglass that I need now you got to make sure to follow his instructions and I'm excited to see how this thing comes out [Music] all right this is nothing like anything I've ever worked with it I got to the point because I was like mixing kind of like concrete I was like I definitely needs a lot more water it's too dry and then all of a sudden there's like a chemical reaction where it started turning into like goo and Tom said you got to get it to better milkshake consistency and I added a little bit of this Optimum 380 so supposedly supposed to soften it up but my gosh this is so wild at this point I was told to only pour an eighth of an inch that'll be our Face coat supposed to be self supposed to be self-leveling too [Music] okay next we're supposed to aggressively work it look at this it's like coarse below but creamy on top okay I should do it supposed to stiffen up here in the next couple of minutes and once it does we can start pouring our top coat or the backer I guess that's what it's called okay looks like it's already setting the instructions say now it can start mixing the backer coat [Music] all right next we're going to add our glass fiber reinforcements give it a mix and then pull it all out [Music] okay this is key Tom said that to prevent any kind of line division from our Face coat and our backer we have to aggressively manipulate it so we can mix it and he said I should do the trick I'm only doing this on the front face because that's the face you'll see there's a quarter inch on top which probably like a half a bag I think we should be good that was two and a half bags of gfrc mix everything's leveled it's kind of wild how it's leveling itself they included this fiber backer which the directions say nothing about it but I'm assuming I could just lay it down because of the back side and making sure it's enough of a gap away from the edge and that should kind of hold everything like maybe an added piece of support okay nobody cried nobody got hurt now let's let it sit for four days uh let us sit over the weekend and now we'll see how she turns out all right

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