Removal of concrete delaminated area from bottom of post tensioned beam?
Removal of concrete delaminated area from bottom of post tensioned beam?
(OP)
What is the lightest weight chipping hammer that is available for removing delaminated concrete from the bottom of a post-tensioned parking structure beam that exhibits a long horizontal crack on one side of the 56 foot span beam, but not on the other side of the beam? I know that there are 7 kg hammers available that we have used in the past, but is there anything lighter, other than manual hammer and chisel? We want to remove anything that might break loose and fall on someone's head, but we do not want to chip out sound concrete that is not in danger of dropping off.






RE: Removal of concrete delaminated area from bottom of post tensioned beam?
However, I just found this:
http://www.cp.com/usen/whatwedo/constructiontools/...
with a 5.5 kg hammer listed.
This site only goes to the 15 lb. size:
http://puckettrents.com/rental/equipment/air/pneum...
Check out Eng-Tips Forum's Policies here:
FAQ731-376: Eng-Tips.com Forum Policies
RE: Removal of concrete delaminated area from bottom of post tensioned beam?
RE: Removal of concrete delaminated area from bottom of post tensioned beam?
A Hilti TE 30 is our usual tool of choice for overhead or small horizontal work in sensitive areas. A Hilti TE 15 is a small tool too, replicating the manual effort of a mason hammer and chisel.
What caused the horizontal crack - incorrectly profiled PT tendon, corrosion? Obviously, the field personnel should be experienced in working with PT before they go chipping in close proximity to the tendons.
RE: Removal of concrete delaminated area from bottom of post tensioned beam?
We have done lots of PT design and repair and require that our engineer be present full time when this p.t. beam is chipped of the delamination. I don't know what caused the horizontal crack, but it is one or more of:
a) a previous repair failed at the bond line
b) rebar corrosion
c) tendon corrosion
d) tendon failure with the tendon failure exerting downward force on the top of a previous extensive soffit repair.
RE: Removal of concrete delaminated area from bottom of post tensioned beam?
RE: Removal of concrete delaminated area from bottom of post tensioned beam?
Go to https://www.us.hilti.com/drilling-%26-demolition/c... and click on Technical Data tab and it shows the weight etc.
Looks like TE 15 has been replaced, but it too is (was?) 8lb, but less impact energy.
A 8 lb electric hammer is pretty light-duty.
RE: Removal of concrete delaminated area from bottom of post tensioned beam?
http://www.dewalt.com/tools/hammerdrills--hammers-...
RE: Removal of concrete delaminated area from bottom of post tensioned beam?
...and No, I don't work for HILTI, but we have a loooooot of HILTI tools.
RE: Removal of concrete delaminated area from bottom of post tensioned beam?
RE: Removal of concrete delaminated area from bottom of post tensioned beam?
RE: Removal of concrete delaminated area from bottom of post tensioned beam?
Thank you SkisAndBikes - - it is not so much the tendons that concern me, it is the 6" wide ledge on the side of the beam that supports the slab that bears onto this ledge (there is an expansion joint parallel to the beam) and I don't want to weaken this ledge when removing concrete below the horizontal cracks in the side of the ledge.
RE: Removal of concrete delaminated area from bottom of post tensioned beam?
RE: Removal of concrete delaminated area from bottom of post tensioned beam?
RE: Removal of concrete delaminated area from bottom of post tensioned beam?
RE: Removal of concrete delaminated area from bottom of post tensioned beam?