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Table 2. - Attack on Concrete <br /> by Soils and Waters Containing Various <br /> Sulfate Concentrations <br /> Relative degree of Percent water-soluble sulfate mg/l sulfate (as SO4) <br /> sulfate attack (as SO4) in soil samples in water samples <br /> Negligible 0.00 to 0.10 0 to 150 <br /> Positivel 0.10 to 0.20 150 to 1,500 <br /> Severe2 0.20 to 2.00 1 ,500 to 10,000 <br /> j Very severe3 2.00 or more 10,000 or more <br /> 1 Use type II cement <br /> 2 Use type V cement, or approved combination of portland cement and <br /> pozzolan which has been shown by test to provide comparable sulfate <br /> resistance when used in concrete. <br /> 3 Use type V cement plus approved pozzolan which has been determined <br /> by tests to improve sulfate resistance when used in concrete with type V <br /> cement. <br /> Z14 <br />