DCI vs Higher Strength Concrete

[Lazzaroni]

Good afternoon all,

I am working on a marine research facility framed with concrete beams and two-way slabs. Concrete mix values were set per ACI: 0.40 max w/c, 5000psi min, increase in rebar cover, etc. I have included a DCI (corrosion inhibiting) admixture for a few research labs that will be directly exposed to salt water. The contractor is requesting to subtitute a higher strength mix (6-7ksi) in lieu of the DCI. Is there a concrete strength where the DCI is not as effective or may even be elimiated due to the more dense(higher strength) mix?

 

[Ron]

Higher density is typically better than DCI, assuming concrete quality, consolidation and increased cover are maintained.

 

[apsix]

The use of GGBS cement replacement is beneficial.