Biaxial stress due to shrinkage in concrete jackets of strengthened columns

Andreas Lampropoulos, Ourania Tsioulou, Stephanos E. Dritsos

Research output: Contribution to journalArticlepeer-review


The effect of restrained concrete shrinkage on the strength of concrete used to strengthen existing structures is investigated in this study. A series of compressive tests are performed on square prism concrete specimens where steel plates are placed in order to restrain free shrinkage. Results indicate that there is a significant reduction of concrete strength (20 to 30%) due to a biaxial stress state induced by the restrained concrete shrinkage. The experimental results are used to validate a numerical procedure proposed to simulate concrete shrinkage. A numerical investigation is then conducted on models that represent the concrete of a reinforced concrete jacket applied to an original column for strengthening purposes where the degree of restraint is different to that of the examined square prism specimens. It was found that that there is a further reduction of concrete strength (30 to 40%).
Original languageEnglish
Pages (from-to)331-340
Number of pages10
JournalACI Materials
Issue number3
Publication statusPublished - 30 Jun 2012


  • biaxial stress state
  • shrinkage
  • strengthening


Dive into the research topics of 'Biaxial stress due to shrinkage in concrete jackets of strengthened columns'. Together they form a unique fingerprint.

Cite this