Abstract
The paper compares the compressive strength of 127 pairs of 6 x 12 in. concrete cylinders capped with neoprene pads restrained by aluminum caps to compressive strengths of cylinders capped with a traditional sulfur mortar compound. Twelve testing variables were examined to determine whether the two capping methods would give similar results under different testing conditions. Although neoprene caps gave significantly different results from the sulfur caps for several testing variables, the results were not significantly different from the mean of the sulfur-capped specimens when proper ASTM procedures were followed for molding and testing cylindrical specimens.
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