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CARINO, N. J. Effects of testing variables on the strength of high-strength (90MPa) concrete cylinders. In: INTERNATIONAL CONGRESS ON HIGH-PERFORMANCE AND QUALITY OF CONCRETE STRUCTURES, 1996, Florianópolis. Anais... Florianópolis, 1996. p.260-271.
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Abstract

A full factorial experimental design was used to investigate the effects of the following variables on cylinder strength: end preparation (sulfur capping versus grinding), cylinder size (100 versus 150 mm diameter), type of testing machine (1.33 -MN capacity versus 4.45-MN capacity), and nominal stress rate (0.14 versus 0.34 MPa/s). Two strength levels were used (45 and 90 MPa), and three replications were tested for each run. Statistical analyses indicated that all the factors had significant effects on the Measured compressive strength. On average, the 100-mm cylinders were about 1.3% the faster stress rate produced about 2.6% greater strength, the ground cylinderswere 2.1 % stronger, and the 1.3 3 - MN testing machine resulted in about 2.3% greater strength. There were significant interactions among the factors, so that the effects were greater than the average values for particular factor settings. Recommendations for modifications to testing standards are-provided.
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