Yeh! Why not?
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Use Caution padames, some cement mixes contain lime. If used in a metal stand you actually create a corrosive action, especially in high humidity conditions. In a wood stand the lime content will actally draw the natural oils from the wood and over a period of time will cause premature cracking, splitting, etc. Lime can be pretty nasty stuff.
BTW padames, if you visit a local diving/scuba shop, you'll find coated lead shot that is sometimes used for ballast bags. In most cases the shot is coated with a substance like copper or even a light wax to reduce toxicity. Usually more expensive than uncoated lead shot, but it will not reduce as many years from your life.
Cost is approx. 30% more than uncoated.
Make sure to get the Cryo'd cement! Don't just settle for the straight audio grade, as has been suggested! You'll just have to upgrade later on and that stuff is not easy to resell here on Audiogon if it ain't Cryo'd.
Seriously, if you haven't handled cement powder before be aware that it's not the most pleasant stuff to handle. If you decide to try it wear gloves and long sleaves or you will find it will suck all the moisture from any skin it comes in contact with and your hands will be as pleasant to touch as a sun-dried dead fish for the next few days. Also definitely wear a dust mask and work outdoors. As has been said, the powder is very fine and gets everywhere, and some of the ingredients can wreak havoc in your lungs.
Cement sounds ok except it reacts with the mositure in the air. Eventually it will harden inside your stands making it impossible to remove. Most likely, hardened cement has its own resonant properties, like stone. If sand is hard to find, try a pet store for a few bags of aquarium rocks as used for fish tanks.
DO NOT USE CEMENT TO FILL YOUR SPEAKER STANDS, it is a very poor material for damping and vibration whcih is what you are looking for a stand to do. Use a mixture of sand, which is one of the best dampening materials and cheap and go to the local firing range and get used (fired) lead shot, rather than the little balls of lead shot since they fired lead will mix well with the sand and then fill you stands with that.