slag meeting ASTM C 989, and silica fume meeting ASTM C 1240, if any, except as limited by 2.7.F.2.c. Table 2-4 Requirements for Special Exposure Conditions Exposure condition Maximum Minimum f’c, normal weight material ratio*, by concrete, psi* weight, normal weight concrete Concrete intended to have low permeability when 0.50 4000 exposed to water Concrete exposed to freezing and thawing in a 0.45 4500 moist condition or to deicing chemicals For corrosion protection of reinforcement in 0.40 5000 concrete exposed to chlorides from deicing chemicals, salt, brackish water, or spray from these sources When both tables 2-4 and 2-5 are considered, the lowest maximum water-cementitious material ratio and highest applicable minimum shall be used. f’c Table 2-5 Requirements for concrete exposed to sulfate-containing solutions Maximum Minimum f’c, w/cm, by Sulfate normal Sulfate sulfate weight, (SO4) in Cement type weight exposure (SO4) in normal water, ppm concrete, soil, % by weight psi1 weight concrete 0.00 SO4 0 SO4 < ≤ ≤ Negligible --- --- --- < 0.10 150 II, IP(MS), IS(MS), 0.10 SO4 150 SO4 < ≤ ≤ Moderate2 P(MS), 0.50 4000 < 0.20 1500 I(PM)(MS), I(SM)(MS) 0.20 SO4 1500 SO4 ≤ ≤ Severe V 0.45 4500 < 2.00 < 10,000 SO4 > V plus Very Severe SO4 > 2.00 0.45 4500 10,000 pozzolan3 When both Tables 2-5 and 2-4 are considered, the lowest applicable maximum water-cementitious material ratio and highest applicable minimum shall be used. f’c Seawater. Pozzolan that has been determined by test or service record to improve sulfate
slag meeting ASTM C 989, and silica fume meeting ASTM C 1240, if any, except as limited by 2.7.F.2.c. Table 2-4 Requirements for Special Exposure Conditions Exposure condition Maximum material ratio*, by weight, normal weight concrete Minimum f’c, normal weight concrete, psi* Concrete intended to have low permeability when exposed to water 0.50 4000 Concrete exposed to freezing and thawing in a moist condition or to deicing chemicals 0.45 4500 For corrosion protection of reinforcement in concrete exposed to chlorides from deicing chemicals, salt, brackish water, or spray from these sources 0.40 5000 When both tables 2-4 and 2-5 are considered, the lowest maximum water-cementitious material ratio and highest applicable minimum f’c shall be used. Table 2-5 Requirements for concrete exposed to sulfate-containing solutions Sulfate exposure sulfate (SO4) in soil, % by weight Sulfate (SO4) in water, ppm Cement type Maximum w/cm, by weight, normal weight concrete Minimum f’c, normal weight concrete, psi1 Negligible 0.00 ≤ SO4 < 0.10 0 ≤ SO4 < 150 --- --- --- Moderate2 0.10 ≤ SO4 < 0.20 150 ≤ SO4 < 1500 II, IP(MS), IS(MS), P(MS), I(PM)(MS), I(SM)(MS) 0.50 4000 Severe 0.20 ≤ SO4 < 2.00 1500 ≤ SO4 < 10,000 V 0.45 4500 Very Severe SO4 > 2.00 SO4 > 10,000 V plus pozzolan3 0.45 4500 When both Tables 2-5 and 2-4 are considered, the lowest applicable maximum water-cementitious material ratio and highest applicable minimum f’c shall be used. Seawater. Pozzolan that has been determined by test or service record to improve sulfate
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