Epoxy bond capacity of 1/2" dia. x 7-wire prestressing strand
Epoxy bond capacity of 1/2" dia. x 7-wire prestressing strand
(OP)
Anyone have any test data (or related research) into epoxy/concrete/strand bond capacities?
Google gives me a 'squillion' results of epoxy-coated strand, of which I am not interested.
Application is a temporary PT tendon termination where we are terminating an existing stressed single-strand unbonded tendon, and I wish to use a temporary epoxy 'plug' over a given bond length (strip back sheath, de-grease strand etc etc), until a new anchorage is re-established.
I have done this successfully before, but I was 'generous' with the bonded length, and in this current instance I have less distance to play with.
I can always resort back to ACI's transfer/transmission length calculations - based on concrete - however, if there is favorable epoxy data/research available I would be interested.
TIA.
Google gives me a 'squillion' results of epoxy-coated strand, of which I am not interested.
Application is a temporary PT tendon termination where we are terminating an existing stressed single-strand unbonded tendon, and I wish to use a temporary epoxy 'plug' over a given bond length (strip back sheath, de-grease strand etc etc), until a new anchorage is re-established.
I have done this successfully before, but I was 'generous' with the bonded length, and in this current instance I have less distance to play with.
I can always resort back to ACI's transfer/transmission length calculations - based on concrete - however, if there is favorable epoxy data/research available I would be interested.
TIA.






RE: Epoxy bond capacity of 1/2" dia. x 7-wire prestressing strand
http://sites.fct.unl.pt/flat/files/2010_maio_duart...
Check out the references at the end.
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RE: Epoxy bond capacity of 1/2" dia. x 7-wire prestressing strand
From the website of the link that you posted there is also this paper:
Strengthening of Reinforced Concrete Slabs Using Post-Tensioning with Anchorages by Bonding.
Back in 2015 I did the following temporary epoxy anchor for 5 monostrand tendons and used a bond length of 4 ft. Based upon the reference/link you posted I could have used 2 ft!
EDIT: Eng-Tips graphic posting is not working! I shall post picture when it is up working
Again, thank you and appreciate your time and effort.
RE: Epoxy bond capacity of 1/2" dia. x 7-wire prestressing strand
Back in 2015 I did the following temporary epoxy anchor for 5 monostrand tendons and used a bond length of 4 ft. Based upon the reference/link you posted I could have used 2 ft!
The slab punching shear strengthening system using PT by Faria, Lúcio & Ramos in the paper "Strengthening of Reinforced Concrete Slabs Using Post-Tensioning with Anchorages by Bonding" is this: