Quote Originally Posted by Boyan Silyavski View Post
When the steel is in something without oxygen there is no problem rusting. Otherwise all the bridges will fall down.
Yes but the steel in bridges is normally reinforcing and therefore encased in concrete so no air can get to it, if done properly that is! Here we're talking about encasing concrete with steel, there's got to be a hole in to pour the concrete (and for air to escape) and therefore there's a way for air to get in. Now if you could pour it in a vacuum......