Title:
Converting Core Strengths to Equivalent Specified Concrete Strengths
Author(s):
F. Michael Bartlett
Publication:
Concrete International
Volume:
46
Issue:
11
Appears on pages(s):
43-47
Keywords:
method, factor, variation, deviation
DOI:
10.14359/51743323
Date:
11/1/2024
Abstract:
ACI PRC-214.4-21 and ACI CODE-562-21 provide methods for converting concrete core strength test results into equivalent specified concrete strengths. The research discussed in this paper investigates the applicability of these methods as well as their limitations.
Related References:
1. ACI Committee 214, “Obtaining Cores and Interpreting Core Compressive Strength Results—Guide (ACI PRC-214.4-21),” American Concrete Institute, Farmington Hills, MI, 2021, 20 pp.
2. Philleo, R.E., “Increasing the Usefulness of ACI 214: Use of Standard Deviation and a Technique for Small Sample Sizes,” Concrete International, V. 3, No. 9, Sept. 1981, pp. 71-74.
3. Bartlett, F.M., “Discussion of ‘Survey of Practice to Determine Strength of In Situ Concrete from Core Tests’ by John M. Hanson,” ASCE Journal of Performance of Constructed Facilities, V. 22, No. 5, Oct. 2008, p. 348.
4. Bartlett, F.M., and MacGregor, J.G., “Equivalent Specified Concrete Strength from Core Test Data,” Concrete International, V. 17, No. 3, Mar. 1995, pp. 52-58.
5. ACI Committee 562, “Assessment, Repair, and Rehabilitation of Existing Concrete Structures—Code and Commentary (ACI CODE-562-21),” American Concrete Institute, Farmington Hills, MI, 2021, 88 pp.
6. Bartlett, F.M., “Evolution of ACI 562 Code—Part 6,” Concrete International, V. 38, No. 7, July 2016, pp. 36-39.
7. ASTM C42/C42M-20, “Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete,” ASTM International, West Conshohocken, PA, 2020, 7 pp.