Epoxied rebar pullout
Epoxied rebar pullout
(OP)
According to the label on the epoxy that the contractor is using, a #6 rebar dowel epoxied 6" into 2500psi concrete has a bonding strength of approx. 39,000lbs. Here is my question. If you embedded this bar 6" into a 7'x7'x2.5' pier of 3000 psi concrete which has a steel mat at the bottom of the pad, even though the boding strength is more than the dead weight of that pier (approx. 20,000 lbs) I assume that the bar would remain bonded to the surrounding concrete, but a failure cone would break out. Is this correct, and if so, approx. how much force would it withstand before a cone failure? Thanks.
Matt Roberts
Matt Roberts





RE: Epoxied rebar pullout
Allowable loading would be ~9750 lb, assuming proper fire protection and no reduction for corrosion, over sized hole size, field errors, prying, shear loading and temperture effects.
RE: Epoxied rebar pullout
Pullout strength depends on two primary factors: Depth of embedment and bar strength. If the depth of embedment is great, the pullout will develop the entire bar strength to failure. If less than required for the full development, will depend on the shear interface with the concrete.
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RE: Epoxied rebar pullout