I use 3/4" plywood or Plycem blanks, with 3" wide build up screwed and glued on edges to make it 1&1/2" thick, then cover it with tile.
If that's not hard enough, Google is a wonderful thing!
How to Build a Concrete Countertop : How-To : DIY Networkwww.diynetwork.com/how...build-a-concrete-countertop/index.html
DIY remodeling expert Paul Ryan shows how to build and install a custom designed concrete countertop.
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Building Concrete Countertops with Buddy Rhodes - YouTube
► 5:33► 5:33 www.youtube.com/watch?v=imppzBYinp829
Mar 2007 - 6 min - Uploaded by concretedecor
A step by step guide to fabricating beautiful concrete countertops by hand.
How to Make a Concrete Counter Top in Place • Ron Hazelton Online
► 6:23► 6:23 www.ronhazelton.com/.../how_to_make_a_concrete_c...24
Jan 2012 - 6 min
Use an existing vanity or base cabinet to create your own concrete counter top.
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Building Sinks for Concrete Countertops—ConcreteNetwork.com ...
► 5:26► 5:26 www.youtube.com/watch?v=lP8NJojqXLE24
Apr 2008 - 5 min - Uploaded by cntelevisionhttp://www.concretenetwork.com
Tips on using foam sink knockouts to create openings in concrete ...
Making a Concrete Countertop with Sink- Complete Steps - YouTube
► 11:07► 11:07 www.youtube.com/watch?v=ObtkY7gK0EY13
Nov 2011 - 11 min - Uploaded by ExpressionsLTD
In this video we show making a few countertop pieces, some with foam ... Building Sinks for Concrete ...
Concrete Casting: How to Make a Concrete Sink Mold - YouTube
► 8:16► 8:16 www.youtube.com/watch?v=MJ9lgZ3V90o11
Feb 2008 - 8 min - Uploaded by SmoothOnInc
Casting a reproduction concrete sink basin by making a 2-par... ... Use melamine board (formica coated) to ...
Tribe One Customs - Concrete Counter Tops, Bars, Sinks, Furniture ...
► 3:38► 3:38 www.youtube.com/watch?v=2r80ZuDnEsI28
Aug 2009 - 4 min - Uploaded by tribeonecustoms
Tribe One Customs - Concrete Counter Tops, Bars, Sinks, Furniture .... Concrete Sink Molds - Create your ...