Pullout Technique -An Additional Tool for In Situ Concrete Strength Determination


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Title: Pullout Technique -An Additional Tool for In Situ Concrete Strength Determination

Author(s): L.M. Khoo

Publication: Special Publication

Volume: 82


Appears on pages(s): 143-160

Keywords: compressive strength; concrete cores; concretes; nondestructive tests; pullout tests; quality control.

Date: 9/1/1984

This paper presents the results of investigation on a pullout technique for the determination of in-situ strength of concrete. In essence, a pullout test consists of measuring the force required to pull out a specially shaped inserts whose enlarged end has been cast into the concrete. In this investigation, pullout tests were performed on 6OO-mm cubical concrete blocks. Compression strength tests were conducted on standard 15O-mm cubes and also on 1 00 x 200-mm cores drilled from the 6OO-mm blocks. Statistical analysis of the test data shows that there is a good correlation between the pullout strength and the corresponding compressive strength of cubes and cores. The test is simple, inexpensive, effective and has an acceptable degree of reproducibility. It has the potential to be a useful additional tool for in-situ quality control of concrete.