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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Concrete Q&A: Tensile Bond Strength of Concrete
Author(s): Scott Tarr
Publication: Concrete International
Appears on pages(s): 71-72
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?
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