Revisiting Effects of Cylinder Cap Type and Eccentricity— Part II: Failure Mode and End Conditions

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Title: Revisiting Effects of Cylinder Cap Type and Eccentricity— Part II: Failure Mode and End Conditions

Author(s): Michael J. Bolduc, Dan Mullins, and Ken Hover

Publication: Materials Journal

Volume: 115

Issue: 1

Appears on pages(s): 13-20

Keywords: acceptance criteria; bonded caps; compression strength; cylinder testing; neoprene caps; quality control; sulfur caps; test methods; unbonded caps; variability

Date: 1/1/2018

Abstract:
Part I of this paper analyzed compressive strength results from one hundred 6 x 12 in. (152 x 304 mm) cylinders cast from a single batch of ready mixed concrete, tested with both bonded and unbonded cylinder caps, concluding that while either cap type produced approximately equivalent strength, there was a significant difference in the standard deviations of the two populations. Further, strength obtained with unbonded caps was less sensitive to variations in cylinder eccentricity during testing. Part II continues with the observations that predominant failure modes differed with cap type and eccentricity. There is some evidence of connection between the end condition or flatness of the cylinders and failure mode.