Comparison of Pullout Strength of Concrete with Compressive Strength of Cylinders and Cores, Pulse Velocity, and Rebound Number

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Title: Comparison of Pullout Strength of Concrete with Compressive Strength of Cylinders and Cores, Pulse Velocity, and Rebound Number

Author(s): V. M. Malhotra and G. Carette

Publication: Journal Proceedings

Volume: 77

Issue: 3

Appears on pages(s): 161-170

Keywords: bond (concrete to reinforcement); compressive strength; concrete cores; concretes; cylinders; impact hammer tests; nondestructive tests; pullout tests; shear strength; ultrasonic tests.

Date: 5/1/1980

Abstract:
This paper presents comparisons o f pullout strength o f concrete with compressive strength o f cylinders and cores, pulse velocity, and rebound number. A pullout test, which is a relatively new tech- nique, measures with a special tension ram the force required to pull out a specially shaped steel rod whose enlarged end has been cast into a concrete block. The analysis of the test data shows that a significant correlation exists between the compressive strength of cylinders cured under standard conditions and the pullout strength of concrete. This is equally true for the compressive strength of cores drilled from concrete blocks. For the same concrete mix, the pullout strength increased with increasing age, indicating the possible usefulness of these tests for comparative studies. The pullout strength is of the same order of magnitude as the direct-shear strength of concrete, indicating that the pullout test result may be a measure of the direct-shear strength of concrete.