you may be able to tell from the photos, and maybe not, we poured these concrete counters ourselves. they are for the master bathroom, and there are several pieces. a tub surround, a vanity counter, and two sinks. more pictures to come. we did it for several reasons. one of which was cost. i cant really afford to outsource too much at this point, so this was a cost effective way to do it.
we set up forms made of melamine covered particle board in the master bedroom, so we wouldn't have to carry the finished product too far. probably spent 60 bucks on the melamine at home depot. we then caulked the corners and edges to keep any concrete from seeping out the gaps. added foam insulation blocks where we needed voids.
concrete was mixed in the room, with a rented mixer. $28 for 4 hours at home depot. used sackrete concrete (about $30 bucks worth, like 10-11 80# bags) and a little extra portland cement for the mix. we mixed it dry enough to hold in your hand. put in one inch deep first, then vibrated underneath with a $20 electric block sander from disposable tool depot, harbor freight. then, we laid in the .5" rebar, and added another inch of concrete on top. vibrate again, sides and bottom.
after about 2 weeks, we pulled off the forms, and flipped them over, exposing the finished surface. it looks awesome. color is very similar to soapstone. (we added no color to the mix) very very smooth, and almost no voids. i sanded the finished surface with 100 grit sandpaper, and then again with 220, and it came out almost as smooth as glass, with a little matte finish. used some grout and solid surface sealer (30 bucks for a pint) from home depot. 2 coats. and then 3 coats of liquid floor wax (3 bucks a can) and it all soaked in nicely, penetrating the surface and leaving no residue.
the suckers are heavy. but they look super nice, and for less than a couple hundred dollars, definitely the most cost effective way to go. i'll post more pictures once they are all finished out and in place.
master bathroom is almost finished, and the other upstairs bathroom is about 98% finished as well. pictures to come on both once they are finished.
-kk