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Materials 2019, 12(2), 207; https://doi.org/10.3390/ma12020207

Early-Age Evolution of Strength, Stiffness, and Non-Aging Creep of Concretes: Experimental Characterization and Correlation Analysis

1
Institute for Mechanics of Materials and Structures, TU Wien—Vienna University of Technology, Karlsplatz 13/202, 1040 Vienna, Austria
2
College of Civil Engineering, Tongji University, No. 1239, Si Ping Rd., Shanghai 200092, China
3
Smart Minerals GmbH, Franz-Grill-Straße 9, 1030 Vienna, Austria
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 7 December 2018 / Revised: 21 December 2018 / Accepted: 27 December 2018 / Published: 9 January 2019
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Abstract

Six different concretes are characterized during material ages between 1 and 28 days. Standard tests regarding strength and stiffness are performed 1, 3, 7, 14, and 28 days after production. Innovative three-minute-long creep tests are repeated hourly during material ages between one and seven days. The results from the standard tests are used to assess and to improve formulas of the fib Model Code 2010: the correlation formula between the 28-day values of the strength and the stiffness, and the evolution formulas describing the early-age evolution of the strength and the stiffness during the first four weeks after production. The results from the innovative tests are used to develop a correlation formula between the 28-day values of Young’s modulus and the creep modulus, and an evolution formula describing the early-age evolution of the creep modulus during the first four weeks after production. Particularly, the analyzed CEM I concretes develop stiffness and strength significantly faster than described by the formulas of the Model Code. The creep modulus of the investigated concretes evolves significantly slower than their strength and stiffness. Thus, concrete loaded at early ages is surprisingly creep active, even if the material appears to be quite mature in terms of its strength and stiffness. View Full-Text
Keywords: fib Model Code 2010; hardening of concrete; strength; stiffness; creep modulus fib Model Code 2010; hardening of concrete; strength; stiffness; creep modulus
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Ausweger, M.; Binder, E.; Lahayne, O.; Reihsner, R.; Maier, G.; Peyerl, M.; Pichler, B. Early-Age Evolution of Strength, Stiffness, and Non-Aging Creep of Concretes: Experimental Characterization and Correlation Analysis. Materials 2019, 12, 207.

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