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Book
Guide for Obtaining Cores and Interpreting Compressive Strength Results
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
  • F. M. Bartlett
  • A. L. Kaufman
  • David Newton Richardson, Missouri University of Science and Technology
  • W. L. Vogt
Abstract
Core testing is the most direct method to determine the compressive strength of concrete in a structure. Generally, cores may be obtained to assess whether concrete in a new structure complies with strength-based acceptance criteria or to evaluate the structural capacity of an existing structure based on the in-place concrete strength. in either case, the process of obtaining core specimens and interpreting strength test results is often confounded by various factors affecting in-place concrete strength or measured strength of test specimens. the scatter in strength test data, which is unavoidable given the inherent randomness of in-place concrete strengths and the uncertainty attributable to preparation and testing of the specimens, may further complicate compliance and evaluation decisions. This guide summarizes practices for obtaining cores and interpreting core compressive strength test results. Factors that affect in-place concrete strength are reviewed so sampling locations that are consistent with objectives of the investigation can be selected. Strength correction factors are presented for converting the measured strength of non-standard core-test specimens to the strength of equivalent specimens with standard diameters, length-to-diameter ratios, and moisture conditioning. This guide provides direction for checking strength compliance of concrete in a structure under construction and methods for determining equivalent specified strength to assess capacity of an existing structure. the materials, processes, quality control measures, and inspections described in this document should be tested, monitored, or performed as applicable only by individuals holding the appropriate ACI Certifications or equivalent.
Department(s)
Civil, Architectural and Environmental Engineering
Keywords and Phrases
  • Compressive Strength,
  • Core,
  • Hardened Concrete,
  • Sampling,
  • Test
International Standard Book Number (ISBN)
9780870314926
Report Number
ACI 214.4R-10
Document Type
Book
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2010 American Concrete Institute (ACI), All rights reserved.
Publication Date
1-1-2010
Citation Information
F. M. Bartlett, A. L. Kaufman, David Newton Richardson and W. L. Vogt. Guide for Obtaining Cores and Interpreting Compressive Strength Results. (2010)
Available at: http://works.bepress.com/david_richardson/74/