3 ms·
A big part of the problem with coated steel rebar is that rebar is treated very roughly on construction sites, and any nick or failure of the coating is really
by ThrustVectoring 7y ago
A big part of the problem with coated steel rebar is that rebar is treated very roughly on construction sites, and any nick or failure of the coating is really bad news when the chemical isolation provided by the concrete fails. Instead of the corrosion happening relatively uniformly at a slow rate across the entire length of the reinforcing bar, it'll happen at a few select sites at a significantly higher rate.
- numakerg 7y agoWhat about using plastic or some flexibly epoxy. Would it have some adverse effect or is there a cost issue?
- ThrustVectoring 7y agoEpoxy-coated steel rebar has the problem I mentioned, as well as being more expensive than standard rebar. You can remove the steel and use non-corroding materials, but these tend to have significantly less stiffness than steel (and reinforcing stiffness determines the load-to-crack-size ratio)
- dustfinger 7y agoThat is really interesting. I didn't realize that corrosive oxidation would become concentrated and react at a higher rate if the point of exposure was limited.
- asdff 7y agoWhy isn't it galvanized like a nail or a porsche?
- ThrustVectoring 7y agoIt can be, but it adds cost to the project, and any galvanized rebar has to be bent before it gets galvanized rather than on-site.