Quote:
Originally Posted by 1968Cayman
You're absolutely right, there is a concrete intended for architectural pieces; my problem is that I need a really high strength material to support what's going on top- an 8-head Cornelius soda dispenser with its own ice bank. The install manual recommends a surface capable of holding 750+ lbs. There's also going to be a multi-head beer dispenser, popcorn machine and bar sink . . . the good news is that the sink plug worked really well the first time around. It was designed to come out in pieces so it could be reused if necessary.
edit: The Quickrete product recommended for countertops is Non-Shrink Precision Grout. I never really thought of grout in this manner but look at the numbers:
Compressive Strength at 28 Days:
Plastic - 14000 psi (96.5 MPa)
Flowable - 12000 psi (86.5 MPa)
Fluid - 8000 psi (55.2 MPs)
Second edit: Okay, so Quickrete's newsletter recommended the above grout product for concrete counters. However, they also have a concrete product made specifically for concrete countertops called- wait for it- Countertop Mix. Why they'd push the grout over the mix is one of life's great mysteries.
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It is not the compressive strength you need to hold up all that weight. It is your support down below. Is this going on a commerical setting or a home? do you have cabinets down below? If so, you need to beef up that area and do not go over 3 feet in length on that one cabinet. under normal condition, I almost never built my cabinets more then 3' in length. have your finish counter sitting on 3/4" plywood subtop should do the trick. If your cabinets are built and install correctly, it should hold up a LOT of weight. Make sure you shim both front and back of the side and not just bottom shelf. Build your toe kick out of wood or 3/4" plywood. try and not use those European leg levelers. They are great for installation, but...
Are your cabinets or what's going below in place already? Show me a picture, maybe I can help you a bit better. I have done lots of custom kitchens and baths. I also own a cabinet/wood shop.