Concrete Beams - Construction Joints
Concrete Beams - Construction Joints
(OP)
Hello All:
I was just wondering what the standard practice is when it comes to prepping a construction joint in a concrete structural element:
We typically specify that constructions joints be keyed and/or doweled depending on the structural element. For prep we specify that the existing concrete surface be wire brushed, cleaned and moistened prior to placing new concrete against it. In some instances we have also specified epoxy bonding agent prior to new concrete pour.
I am being told that wire brush and epoxy bonding agent is kinda excessive. Thoughts, comments are appreciated.
Thank you.
I was just wondering what the standard practice is when it comes to prepping a construction joint in a concrete structural element:
We typically specify that constructions joints be keyed and/or doweled depending on the structural element. For prep we specify that the existing concrete surface be wire brushed, cleaned and moistened prior to placing new concrete against it. In some instances we have also specified epoxy bonding agent prior to new concrete pour.
I am being told that wire brush and epoxy bonding agent is kinda excessive. Thoughts, comments are appreciated.
Thank you.






RE: Concrete Beams - Construction Joints
If it's a critical element (like a grade beam with a horizontal joint) we'll ask for the surface to be roughened to a 1/4" amplitude.
RE: Concrete Beams - Construction Joints
RE: Concrete Beams - Construction Joints
All other points mentioned above are important but often not done nor enforced. The joint should be roughened and cleaned of all oil, grease and dirt etc and dampened before placing the new concrete.
RE: Concrete Beams - Construction Joints
RE: Concrete Beams - Construction Joints
Thank you for the input!