Can anyone explain why the concrete water-cementitious ratio requirements for ACI 318, Table 4.3.1, Exposure Class S3 of 0.45, is different than ACI 201.2R, Table 6.3, Class 3 exposure with a w-c ratio 0.40? I tend to take the more conservative approach of ACI 201.2R, but may need to explain to my client why the deviation from ACI 318.
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