Yesterday I ordered the concrete mix from Lowes. Tried to find plasticizer there but they didn’t know what I was talking about. I then whet to Home Depot and found some under the name “water reducer”. Neither Lowes or Home Depot had color charts for Quikcrete’s color additives so I have an e-mail into Quickcrete to try to get one.
This link has a lot of information about reinforcing concrete but I’m having trouble finding the products in small quantities. http://www.concretenetwork.com/glass-fiber-reinforced-concrete/
I’ll probably use some kind of small diameter wire mesh. Here’s a response from the president of the concrete countertop institute about hanging reinforcement;
Thanks for contacting us. Reinforcing should never be pushed into fresh concrete (cement is not concrete, it’s an ingredient). Pushing the reinforcing into the concrete will cause ghosting, and the pattern of the reinforcing will be evident on the face of the concrete slab. This is often permanent and generally viewed as undesirable.
Before filling the forms simply hang the reinforcing from stiff pieces of wood, metal rods or other objects that are laid across the open forms. Use wire or cable ties (nylon zip ties) to hang the reinforcing at the correct depth. Pour the concrete through the holes in the reinforcing grid. It’s important to pour it between the reinforcing wires and not over them. If the concrete is poured over the ladder wire it may ghost.
In the videos you see the students assembling the reinforcing in the empty forms. The reinforcing is not placed in the bottoms of the forms and the countertops are cast upside-down, not right side-up.
Hope this helps,
Jeffrey Girard, P.E.
The Concrete Countertop Institute
Raising the standard.
If I have time tonight, I’ll make the templates shown below,
This will be used to make sure I have the correct thickness on the sides of the integrated sink.
This will be used to form the o-ring groove and bolts