Sodium chloride is a by-product of our manufacturing process. The salt isn't pure enough for us to go to much effort to market it, but we wonder if it could be sold in bulk to contractors for use as granular fill under concrete floors on ground.
It would have to be assumed that some of the floors under which the salt was used would contain reinforcing steel. Sodium chloride in the presence of moisture could hasten the corrosion of this steel. The salt would not chemically attack the concrete itself. If any floors were constructed over sodium chloride fill with improper provision for drainage, the sodium chloride might get periodically wetted, then partially dissolve and flow away leaving the floor with inadequate support. Sodium chloride is extensively used as a deicer for melting snow and ice on pavements. We wonder why your by-product couldn't be sold for this purpose.