Advice on inhibitor of chemical reaction

I am experimenting with Ransome siliceous stone - see [login to view URL] - which is basically a mixture of sodium silicate, calcium chloride and an aggregate (sand). The problem is, sodium silicate and calcium chloride react almost instaneously which makes the process of making the artifical stone awkward and difficult. I seek an advice from someone with good chemistry knowledge, how to either inhibit this reaction (possibly with some chemical that is safe and cheap) so that it does not occur so quickly or design the process in such a way to make the process of obtaining the artificial stone less cumbersome.