Hi Muhammad,

I have not used sodium metasilicate at a large-scale like you are suggesting, but I have used it in the laboratory in small (gram) quantities.  It is highly basic (~pH 14) in solution and can be mixed with a weak to moderate acid (nitric, HCl, acetic, lactic, etc.) to form a gel (which is how I've used it--to grow minerals).  From a little web-searching, it appears that CaCl2 is added to concrete to increase the rate at which it sets and/or allows for setting at a decreased temperature, whereas sodium metasilicate is added to improve the viscosity characteristics of the slurry (to prevent separation of water and cement).  It seems that you may need both reagents in your cement depending on how deep you are having to grout.  I recommend that you experiment with a few cement recipes in a controlled (laboratory) setting before using one on a deep borehole.  One more fact: sodium metasilicate gel is stable to at least 120°C, so this could be relevant if you are grouting a hole that is a few km deep.

Hope this helps.

Jason

Dear Jason B. Price,

Thanks for your Valuable Reply.

i have in this week I have applied 9,9 recipes of both chemicals slurries of 10 Kg weight on Lab scale . And whats results I obtained very very exciting and surprising to me.

I was really impressed by Sodium meta silicate results.

That's why I wants to know the experiences of others about both chemicals.

Regards