Time Development of Concrete Strength in Comparison with the Development of Concrete Shrinkage

Abstract:

Concrete producer’s experience shows that the development of concrete properties (concrete strength, volume changes of concrete) can be significantly different from that presumed by the designer according to the standards for designing concrete constructions. Especially concrete mixtures for prefabricated structures contain a large amount of cement to achieve a rapid strength that allows precast element to be manipulated, which can cause inceased shrinkage of concrete. The results of the experiment, which verified the development of the compressive strength, tensile strength and the shrinkage of concrete intended for precast structures, are presented in the article. The results of the experiment are compared with the calculations according to ČSN EN 1992-1-1. It was found that the actual shrinkage of the concrete was up to three times higher than the theoetical values of shrinkage.

• Periodical: Solid State Phenomena (Volume 292)
• Pages: 69-75
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.292.69
• Online since: June 2019
• Authors: Miloslav Janda, Miloš Zich*
• Keywords: Compressive Strength of Concrete, Precast Elements, Shrinkage, Tensile Strength of Concrete

References

[1] ČSN EN 12390-3. Testing hardened concrete – Part 3: Compressive strength of test specimens. Prague: The Office for Standardization, Metrology and Testing, (2009).

[2] ČSN EN 1992-1-1 ed. 2 (731201). Eurocode 2: Design of concrete structures – Part 1-1: General rules and rules for buildings. Prague: The Office for Standardization, Metrology and Testing, (2011).

[3] ČSN EN 12390-5 (731302). Testing hardened concrete – Part 5: Flexural strength of test specimense. Prague: Czech Office for Standards, Metrology and Testing, (2009).

[4] ČSN EN 12390-6 (731302). Testing hardened concrete – Part 6: Tensile splitting strength of test specimens. Prague: Czech Office for Standards, Metrology and Testing, (2010).

DOI: 10.3403/30200045

[5] ČSN EN 12504-2 (731303). Testing concrete in structures – Part 2: Non-destructive testing – Determination of rebound number. Prague: Czech Office for Standards, Metrology and Testing, (2013).

DOI: 10.3403/30397523

[6] ZVOLÁNEK, Lukáš. Experimental and numerical analysis of rheological processes during the concrete maturation. Doctoral thesis. Brno: Brno University of Technology, (2017).

[7] HOFÍREK, Radovan, ZICH, Miloš, 2014. The effective cross-section thickness and its effect on shrinkage. In: 21. Betonářské dny 2014 Sborník ke konferenci. Hradec Králové: Czech Concrete Society ČSSI, pp.352-358. ISBN 978-80-903806-7-7.