Use of the Break-Off Method for the Evaluation of High Performance Concreteby Tarun R. Naik, Univ of Wisconsin-Milwaukee, Milwaukee, United States,
Amr S. Hassaballah, Univ of Wisconsin-Milwaukee, Milwaukee, United States,
Abstract: The Break-Off test is one of the recent developments for testing in-place concrete strength. This research was undertaken to investigate the reliability of the Break-Off test as a measure of the in-place strength of 8000 psi cioncrete. This high performance concrete is generally used in highly stressed precast or post-tensioned members, in high rise buildings, and/or in severe exposure conditions. To achieve this objective, the following parameters were investigated: aggregate shape; slab thickness; and, method of obtaining the cylindrical Break-Off test specimens, either by inserting a sleeve in the fresh concrete or by drilling a cylindrical core after the concrete has hardened. It is concluded that the Break-Off method can estimate with good correlation the in-place compressive strength of high-strength concrete.
Subject Headings: Material tests | High-performance concrete | Compressive strength | High-strength concrete | Precast concrete | Tension | High-rise buildings
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