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Evaluation of capping systems for high-strength concrete cylinders.
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2006-03-01
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[PDF-752.96 KB]
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Abstract:This study focused on the effects of capping systems on the compressive strength of high-strength concrete. The compressive strength levels ranged from 6,000 psi to 14,000 psi. The three systems investigated were ground ends, bonded caps, and unbonded pads. The capping compounds investigated were commercially available and advertised for testing high-strength concrete. The unbonded pads used were neoprene pads with a Shore A Durometer hardness of 70. A specialty grinding machine was used to obtain the required planeness and perpendicularity on the ground end cylinders. Statistical analyses were used to determine if any significant differences existed between the compressive strength results of the capping methods. No significant difference was found between the capping systems at the 6,000 psi, 10,000 psi, and 14,000 psi levels. However, significant differences were detected at the 8,000 psi and 12,000 psi levels. For the 8,000 psi group, ground ends produced significantly lower compressive strengths than three of the capping compounds. For the 12,000 psi group, ground ends produced significantly lower strengths than one of the capping compounds and the unbonded pads. No other clear statistical distinctions could be made from the analysis performed. In all the strength levels but the 6,000 psi level, the ground ends method produced lower compressive strengths than the rest of the methods under study.
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