Concrete Q&A: Tensile Bond Strength of Concrete

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Title: Concrete Q&A: Tensile Bond Strength of Concrete

Author(s): Scott Tarr

Publication: Concrete International

Volume: 40

Issue: 7

Appears on pages(s): 71-72

Keywords:

Date: 7/1/2018

Abstract:
My company installed a bonded topping on an existing slab. The project specifications required a compressive strength of 4000 psi (27.6 MPa) for the topping concrete. Although our concrete met that requirement, we were directed to remove and replace the topping. The owner’s explanation: The concrete topping was inadequate because pull-off tests failed to achieve 400 psi (2.8 MPa), which is 10% of the compressive strength. Does ACI provide any recommendation on acceptable bond strength for toppings/overlays?