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
DOI:
10.14359/51701292
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.
Related References:
1. Bolduc, M.; Mullins, D.; and Hover, K., “Revisiting Effects of Cylinder Cap-Type and Eccentricity—Part I, Variability of Strength,” ACI Materials Journal, V. 115, No. 1, Jan. 2018, pp. 5-12. doi: 10.14359/51701291
2. Wedding, P. A., and Ozyildirim, C., “Neoprene Pads for Capping Concrete Cylinders,” Cement, Concrete, and Aggregates, V. 7, No. 1, 1985, pp. 25-28. doi: 10.1520/CCA10040J
3. ASTM C39/C39M-14a, “Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens,” ASTM International, West Conshohocken, PA, 2014, 7 pp.
4. ASTM C31/C31M-12, “Standard Practice for Making and Curing Concrete Test Specimens in the Field,” ASTM International, West Conshohocken, PA, 2012, 6 pp.
5. ASTM C617/C617M-12, “Standard Practice for Capping Cylindrical Concrete Specimens,” ASTM International, West Conshohocken, PA, 2012, 6 pp.
6. De Veaux, R. D.; Vellemen, P. F.; and Bock, D. E., Intro Stats, second edition, Pearson, Boston, MA, 2006, pp. 604-609.
7. Burg, R. G.; Caldarone, M. A.; Detwiler, G.; Jansen, D. C.; and Willems, T. J., “Compression Testing of HSC: Latest Technology,” Concrete International, V. 21, No. 8, Aug. 1999, pp. 67-76.