Adhesion between concrete and bare steel
Adhesion between concrete and bare steel
(OP)
I had a discussion with a colleague regarding the pullout capacity of a bare steel pipe embedded in 25 MPa concrete. What is the adhesion value between concrete and bare steel?
How is it related to the 28 day strength of the concrete?
Any comments appreciated.
How is it related to the 28 day strength of the concrete?
Any comments appreciated.






RE: Adhesion between concrete and bare steel
RE: Adhesion between concrete and bare steel
RE: Adhesion between concrete and bare steel
OLD CA SE
RE: Adhesion between concrete and bare steel
It concludes that the maximum working bond stress between round bars and concrete should not exceed 4% of the 28 day concrete compressive strength (cylinder strength). This is approximately one third the value required to cause first slip of the bar, and is approximately one-fifth the maximum bond resistance.
So for 25 MPa concrete you are looking at an upper value of 1 MPa for working stress, which agrees with PEInc above.
Rust increases bond resistance by approximately 15%.
Polishing decreases resistance by approximately 65%