I was recently blessed with researching the possibility of making bentonite based grouts with our sodium montmorillonite reserves. As I reviewed the industry standards, I have come to the conclusion that ultimately Permeability is the key factor in producing a succesful grout. After that was discovered, I consulted with ASTM Method D 5084 and became literally baffled at the amount of variables. I don't have a clue of sample preparation, equipment needed, method A-F? Does anyone out there have any experience in the field with bentonite based grouts? Am I going down the wrong path? Please advise.