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i <br /> Table 1. - Bureau of Reclamation <br /> Cementitious Materials Options for <br /> Sulfate Resistance <br /> I. Positive Sulfate Attack (0.10 to 0.20% or 150 to 1,500 ppm) <br /> A. Type II cement <br /> B. Type II cement plus class N. F, or C pozzolan <br /> R<2.5 <br /> C. Type IP (MS) blended cement <br /> k R�2.5 <br /> II . Severe Sulfate Attack 0.20 to 2.0 1 500 to 10,000 ppm) <br /> A. Type V cement <br /> B. Type V cement plus class N, F, or C pozzolan <br /> R --2.5 <br /> Type II cement Plus- class N. F, or C pozzolan <br /> R -1.5 <br /> D. Type IP (MS) blended cement <br /> R<2.5 if C3A<5.0 <br /> R<1.5 if 5.0<C3A<8.0 <br /> III. Very Severe Sulfate Attack (2.00% or more or 10,000 ppm or more) <br /> A. Type V cement plus class N, F, or C pozzolan <br /> R<1.5 <br /> B. Type II cement plus class N, F, or C pozzolan <br /> R-<0.75 <br /> C. Type IP (MS) blended cement <br /> R-<1.5 if C3A-c5.0 <br /> R<0.75 if 5.0<C3A <8.0 <br /> 213 <br />