Anisotropic Concrete Compressive Strength in Existing Structures

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Assessment of the load‐carrying capacity of existing concrete structures is often based on the concrete compressive strength obtained from drilled cores. These cores are typically drilled perpendicular to the concrete surface, under the assumption that the mechanical properties of the concrete are isotropic. Recent
studies however showed that concrete may in fact be subject to anisotropic behaviour. These studies are limited to newly‐cast concrete only, and little is known about the anisotropic behaviour of existing structures in‐service. This paper presents the first results of a large experimental programme where the anisotropy of the compressive strength in existing concrete structures is investigated. For this, 195 cores, drilled from a large concrete bridge located in Denmark, are tested. Three drilling directions are considered. The results are
analysed using statistical techniques. The results showed that there is a statistically significant difference between the compressive strength in longitudinal and transverse/vertical direction, with an average value of 4.5 MPa in the disadvantage of the longitudinal direction.
Original languageEnglish
Title of host publication20th Congress of IABSE, New York City 2019 : The Evolving Metropolis - Report
PublisherInternational Association for Bridge and Structural Engineering
Publication date2019
ISBN (Print)978-3-85748-165-9
ISBN (Electronic)9783857481659
Publication statusPublished - 2019
Event2019 IABSE Congress: The Evolving Metropolis - New York City, United States
Duration: 4. Sept 20196. Sept 2019


Conference2019 IABSE Congress
Country/TerritoryUnited States
CityNew York City
Internet address


  • Assessment
  • Bridges
  • Compressive strength
  • Concrete structures
  • Existing structures
  • Statistical analyses


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