[Jagshund]

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.