Dear Georage
Treat the soil with antitermite chemical at foundation level, in foundation and under floors before laying floor and all the wood work will be given anti termite chemical coat before fixing it. It is no worth while to mix in concrete. There are many articles about termite treatment at website gharexpert.com in safety section of construction. Link given below for ready reference.
http://www.gharexpert.com/articles/Termite-Control-2000/Termite-Control_0.aspx