Comparison of core and in-place compressive strengths for early-age concrete

Agustin Spalvier, James A. Bittner, Kerry Hall, John S. Popovics

Research output: Contribution to journalArticlepeer-review


Accurate determination of concrete in-place strength remains a challenge. Although drilled cores provide reasonable representation of in-place strength, core strength results are known to be affected by factors such as core aspect ratio, moisture condition, and internal damage caused by extraction. To account for these effects, previous research has developed correlations between cores and standard molded companion cylinders in mature concrete. In this investigation, the authors evaluate the effectiveness of compressive strength estimation for new pavement construction using cores for wet and air-dried sample conditions, and for the presence of embedded steel reinforcing bar. The effects of these conditions on in-place strength estimates for early-age concrete with “good” and “low” quality are studied using statistical analysis. The actual in-place strength is determined using cast-in-place cylinders. Based on the analysis, the optimal correction factors for core to in-place strengths for early-age concrete are 1.05, 1.20, and 1.08 for 1-day air-dried cores, 1-day wet cores, and 1-day air-dried cores containing steel reinforcing bar, respectively.

Original languageEnglish (US)
Pages (from-to)63-72
Number of pages10
JournalACI Materials Journal
Issue number3
StatePublished - May 2019


  • Core
  • Correction factor
  • In-place cylinder
  • In-place strength
  • Pavement

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)


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