Pullout Testing of High-Strength Concrete Membersby Ronald L. Dilly, Univ of Houston, Houston, United States,
Michael Abshire, Univ of Houston, Houston, United States,
Abstract: An experimental investigation of a high-strength concrete mixture was undertaken to measure and evaluate pullout and compressive strength properties. Two columns, a slab, and cylindrical specimens were cast with a condensed silica fume, CSF, concrete mixture. This mixture achieved a 28 day strength in excess of 10,000 psi. At an age of three days, pullout tests were obtained from three elevations of each column; and at ages of 1, 3, 7, 14, 28 and 61 days, pullout test results were obtained from the slab, and cylindrical specimens were tested for strength. Although previous pullout strength investigations of cast vertical members report top-to-bottom strength differences when typical mixtures were used, the results of this investigation show that these differences may not occur when a member is cast with a CSF mixture. Statistical parameters corresponding to a linear regression analysis of pullout and compressive strength results show a relatively 'tight fit,' which indicates that the pullout test method can be applied toward evaluating and controlling the quality of concrete cast with high-strength mixtures.
Subject Headings: High-strength concrete | Pullout behavior | Mixtures | Compressive strength | Reinforced concrete | Structural strength | Material tests
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