| 摘要 |
A method and composition for providing cathodic protection to underground steel structures is disclosed in which a composition comprising calcium hydroxide, calcium silicate and calcium nitrite is added to backfill for raising the backfill pH above 8 and an electrical current is applied to polarize the surface of the steel structure whereby the surface of the steel structure is maintained negative relatives to the backfill. Magnesium hydroxide and aluminum hydroxide can be used as a substitute for a portion of the calcium hydroxide.
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