Title:
Concrete Q&A: Further Discussion on Moisture Conditioning of Core Samples
Author(s):
Publication:
Concrete International
Volume:
47
Issue:
8
Appears on pages(s):
74-76
Keywords:
gradient, air, water, requirement
DOI:
10.14359/51749082
Date:
8/1/2025
Abstract:
This month’s Q&A is a follow up to the February 2025 Q&A. It discusses changes in core conditioning requirements in ACI CODE-318 and ASTMC42/C42M that took place within the last 25 years and research findings that led to these changes. It also explains whether standard moisture conditioning requirements could be changed on some projects.
Related References:
1. “Concrete Q&A: Moisture Conditioning of Core Samples,” Concrete International, V. 47, No. 2, Feb. 2025, pp. 66-68.
2. 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.
3. Neville, A., “Core Tests: Easy to Perform, Not Easy to Interpret,” Concrete International, V. 23, No. 11, Nov. 2001, pp. 59-68.
4. ASTM C42/C42M-99, “Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete,” ASTM International, West Conshohocken, PA, 1999, 4 pp.
5. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-99) and Commentary (ACI 318R-99),” American Concrete Institute, Farmington Hills, MI, 1999, 392 pp.
6. Bartlett, F.M., and MacGregor, J.G., “Effect of Moisture Condition on Concrete Core Strengths,” ACI Materials Journal, V. 91, No. 3, May-June 1994, pp. 227-236.
7. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-89) and Commentary (ACI 318R-89),” American Concrete Institute, Farmington Hills, MI, 1989, 392 pp.
8. ASTM C42/C42M-90, “Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete,” ASTM International, West Conshohocken, PA, 1990, 4 pp.
9. Fiorato, A.E.; Burg, R.G.; and Gaynor, R.D., “Effects of Conditioning on Measured Compressive Strength of Concrete Cores,” Concrete Technology Today, V. 21, No. 3, Dec. 2000, pp. 1-3.
10. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-02) and Commentary (ACI 318R-02),” American Concrete Institute, Farmington Hills, MI, 2002, 443 pp.
11. ASTM C42/C42M-03, “Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete,” ASTM International, West Conshohocken, PA, 2003, 5 pp.
12. ACI Committee 318, “Building Code for Structural Concrete—Code Requirements and Commentary (ACI CODE-318-25),” American Concrete Institute, Farmington Hills, MI, 2025, 699 pp.