Paint and Embedded Steel
Paint and Embedded Steel
(OP)
I am writing to inquire for you thoughts on paint on embedded steel. I currently have two particular situations the first is a wide flange that is completely embedded in concrete. I have called for this item to not be painted. Consulting Engineer has questioned this item and has made reference to epoxy coated rebar and so similiarly the wide flange should be painted. Do has anyone have any references for the preferred practice?
The second situation is for a wide flange that will be fastened to a concrete wall in the vertical position. A grout pad will be placed behind the wide flange to provide for even bearing and to act as a waterstop. I have called for the wide flange to be completely coated with an epoxy paint. As this will be exposed to the elements I feel the complete section should be painted to prevent corrosion, particulary at the edges. A Consulting Engineer is concerned about the adhesion between the grout and epoxy paint and states the grouted surface should not be painted. I can see the concern about adhesion, however, I have similiar concerns even with the bare steel and grout - "mortar and steel no deal". Any preferences or thoughts?
The second situation is for a wide flange that will be fastened to a concrete wall in the vertical position. A grout pad will be placed behind the wide flange to provide for even bearing and to act as a waterstop. I have called for the wide flange to be completely coated with an epoxy paint. As this will be exposed to the elements I feel the complete section should be painted to prevent corrosion, particulary at the edges. A Consulting Engineer is concerned about the adhesion between the grout and epoxy paint and states the grouted surface should not be painted. I can see the concern about adhesion, however, I have similiar concerns even with the bare steel and grout - "mortar and steel no deal". Any preferences or thoughts?






RE: Paint and Embedded Steel
I'm not sure how adhesion, or a lack thereof, between the grout and the steel column creates a problem, but in the situation you describe, I wouldn't count on the grout to inhibit rust even on the surface facing it. If enough moisture gets between the steel and the grout, the grout will not protect it. If adhesion is required, I suggest applying an adhesive over the paint, and if the concern is the grout sticking to the paint, a properly cured epoxy paint should have less adhesion than the bare steel.
RE: Paint and Embedded Steel
If you don't coat the item, the corrosion is general and slow. It will last for many years, just as rebar.
RE: Paint and Embedded Steel
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Paint and Embedded Steel
RE: Paint and Embedded Steel
RE: Paint and Embedded Steel
Any additional thoughts on the grout / plate interface where the steel is not completely embedded?