The "Pul l-Off" Partially Destructive Test for Concrete


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Title: The "Pul l-Off" Partially Destructive Test for Concrete

Author(s): A.E. Long and A. McC. Murray

Publication: Special Publication

Volume: 82


Appears on pages(s): 327-350

Keywords: compressive strength; concretes; cylinders; epoxy resins; probes; pull-off tests.

Date: 9/1/1984

A wide range of approaches are available for estimating the strength of in-situ concrete and these include indirect methods such as cube or cylinder testing, non-destructive methods and the more recently introduced partially destructive tests. In the latter category the pull-off test involves bonding a circular steel probe to the concrete surface using an epoxy resin adhesive which is stronger than concrete in tension. By measuring the load required to cause a tensile failure in the concrete the equivalent compressive strength can be estimated by using an appropriate calibration graph. This paper summarises the results of tests carried out over the past nine years and includes a comparison with other partially destructive methods which are currently available. The results of field tests, carried out during the construction of a multi-storey parking garage, are reported as well as two case histories relating to commercial applications. In all instances the viability and accuracy of this in-situ test method have been proven.