4.5 Corrosion protection In polluted ground areas there can be corrosion problems with metal foundation members as well as with concrete. Concrete is normally resistant to corrosion; however,if sulfates are present,it may be necessary to use sulfate-resistant concrete. It may occasionally be necessary to use air- entrained concrete for foundation member. Steel piles are not suggested for use in sea water unless coated and not allowed to undergo wet-dry cycle. 阳喝4.5 Corrosion protection ▪ In polluted ground areas there can be corrosion problems with metal foundation members as well as with concrete. ▪ Concrete is normally resistant to corrosion; however, if sulfates are present, it may be necessary to use sulfate-resistant concrete. ▪ It may occasionally be necessary to use air￾entrained concrete for foundation member. ▪ Steel piles are not suggested for use in sea water unless coated and not allowed to undergo wet-dry cycle