for DCI Corrosion inhibitor. There are other products like it so do a full search and research it yourself. This product is simply added to the wet mix and attempts to chemically nullify the chlorides that may be introduced to the concrete.
You need to follow ACI 318 requirements for the water cement and minimum compressive strength for corrosive salty air. I do not have my ACI with me but I recall that a minimum compressive strength of 4000 or 5000 psi is required or water cement ration of 0.4 (you can find this in he front section of the code, sorry that I can not quote you the table). Many engineers miss this one.
JAE's recommendation is good one. I would recommend using corrosion inhibitor in the mix. The supplier will provide guidance as how many gallons per yard to use.
Consider increasing the cover from ACI minimums as well.
The addition of Ground Granulated Blast-furnace Slag to Ordinary Portland Cement increases the resistance to chloride ion penetration ,therefore reducing the risk of corrosion of the reinforcement. Your local cement/concrete supplier should be able to give advice.
in industrial concrete slabs in hypersaline environments with good results so far.
One of its primary applications is in salt and marine environments. Of interest to you, probably, is that another of its applicatications is in waterproof concrete for tanks and swimming pools.
If the water is sea water, you might want to consider sulphate resistant cement for the concrete. Often, there is a component. Also you might want to spec a mininum cement content...
