DayRooster
Structural
- Jun 16, 2011
- 143
Hypothetical situation after Reading ACI Repair CEUs: A reinforced fixed-fixed concrete beam (1'-6" wide x 3' tall) has been designed with (3)-#8 rebar top and bottom. In this situation, let's say there are no stir ups since the beam shear was sufficient with concrete only. Now let's say 1'-0" from the beam end the concrete has spalled out around the bottom of the rebar and a (1'-6" wide x 9" deep x 1'-0" long) section of concrete is lost.
My question is this: if the concrete is repaired back with conventional concrete repair mortar (sika, eucluid, etc.) would this section of the concrete beam have a reduced shear depth and, therefore, reduced shear strength? Or would you still be able to account for this "patch" to act the same as would be required of monolithic concrete (specifically ACI shear strength sections)?
I am trying to visualize if the crack would start to form diagonally and what it would do once it hit the cold joint repair patch? Would the patch provide extra strength? Or would the concrete patch just split and there we would be left with a typical concrete crack down to the repair and then the crack would follow the shape of the repair cold joint.
Also, I am assuming no epoxy joint compound either. Just conventional cement based concrete repair mortar only.
My question is this: if the concrete is repaired back with conventional concrete repair mortar (sika, eucluid, etc.) would this section of the concrete beam have a reduced shear depth and, therefore, reduced shear strength? Or would you still be able to account for this "patch" to act the same as would be required of monolithic concrete (specifically ACI shear strength sections)?
I am trying to visualize if the crack would start to form diagonally and what it would do once it hit the cold joint repair patch? Would the patch provide extra strength? Or would the concrete patch just split and there we would be left with a typical concrete crack down to the repair and then the crack would follow the shape of the repair cold joint.
Also, I am assuming no epoxy joint compound either. Just conventional cement based concrete repair mortar only.