Comparison of Automated Concrete Shrinkage Measurement Methods

Abstract:

Volumetric changes are deformation properties of concrete that are caused by external or internal forces and can be reversible or irreversible. Relatively significant and irreversible volumetric changes occur during the hydration of clinker minerals during the first stages concrete setting and hardening. From the “real-world” point of view, the volumetric changes associated with drying are the most important – these take place when the leftover mixing water evaporates. The current legislation addresses the volumetric changes of concrete relatively briefly and the calculations of the assumed autogenous shrinkage according to Eurocode 2 are generally related only to the concrete’s strength class, not to the composition of the concrete mixture. The principle of determination of volumetric changes is classified by the standard ČSN 73 1320, which requires the measuring devices with an accuracy of at least 1∙10^-5 of expected proportional deformation. In this experiment, the volumetric changes of the concrete will be monitored by two different measurement methods. Several different test mixtures will be prepared to monitor these changes continuously with an automatic measuring device. In one case, the measurement will take place from the point of fresh concrete and, in the case of the others, immediately after the acquisition of the handling strength, i.e. from the age of 1 day.

• Periodical: Solid State Phenomena (Volume 276)
• Pages: 229-235
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.276.229
• Online since: June 2018
• Authors: Lucia Osuská*, Petr Novosad, Martin Labaj
• Keywords: Concrete Curing, Hydration of Concrete, Measuring Equipment, Shrinkage

References

[1] TAZAWA, E. Autogenous Shrinkage of Concrete. London: E. & F.N. Spon, 1999, First edition. ISBN 0-419-23890-5.

[2] PYTLIK, P. Technologie betonu. VUT Brno: VUTIUM , 2000. Druhé vydání. ISBN 80–214– 647–5.

[3] TZBINFO, Stavba, Podlahy příčky povrchy, Podlahy: Smršťování betonu, platné normy a betonové podlahy. Stavba.tzb-info.cz [online]. 2010 [cit. 2015-12-05]. Dostupné z: http://stavba.tzb-info.cz/podlahy-pricky-povrchy/6479-smrstovani-betonu-platne-normy-a-betonove-podlahy.

[4] HELA, Rudolf. Technologie betonu II. Brno, 2007. Skriptum. VUT v Brně, Fakulta stavební, Ústav technologie stavebních hmot a dílců.

[5] COLLEPARDI, M. Moderní beton. 1. vyd. Praha: Pro Českou komoru autorizovaných inženýrů a techniků činných ve výstavbě (ČKAIT) vydalo Informační centrum ČKAIT, 2009, 342 s. ISBN 978-80-87093-75-7.

[6] TŮMA, Petr a Jiří DOHNÁLEK. Betonové podlahy a smršťování betonu. Betok TKS: Materiály a technologie. Praha: Beton TKS, 2009, 2009(2), 50-56. ISSN 1213-3116.

[7] Y.W. CHAN, C.Y. LIU, Y.S. LU. Effects of slag and fly ash on the autogenous shrinkage of high performance concrete. E. Tazawa (Ed.), Autogenous Shrinkage of Concrete, Taylor & Francis (1999), p.221–228.

DOI: 10.1201/9781482272123-31