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Advances in Materials Science and Engineering
Volume 2017 (2017), Article ID 3627251, 7 pages
https://doi.org/10.1155/2017/3627251
Research Article

Time-Dependent Behavior of Shrinkage Strain for Early Age Concrete Affected by Temperature Variation

1School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
2CREEC (Chongqing) Survey, Design and Research Co. Ltd, Chongqing 400023, China
3Pavement Engineering Center, Technical University of Braunschweig, 38106 Braunschweig, Germany

Correspondence should be addressed to Weina Wang; ten.haey@6180nww

Received 12 August 2016; Revised 12 January 2017; Accepted 1 February 2017; Published 29 March 2017

Academic Editor: Charles C. Sorrell

Copyright © 2017 Yu Qin et al. 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.

Abstract

Shrinkage has been proven to be an important property of early age concrete. The shrinkage strain leads to inherent engineering problems, such as cracking and loss of prestress. Atmospheric temperature is an important factor in shrinkage strain. However, current research does not provide much attention to the effect of atmospheric temperature on shrinkage of early age concrete. In this paper, a laboratory study was undertaken to present the time-dependent shrinkage of early age concrete under temperature variation. A newly developed Material Deformation Tester (MDT), which can simulate consecutive variation of atmospheric temperature, was used to collect the shrinkage strain of specimens and temperature data. A numerical model was established to describe the thermoelastic strain of a specimen. The results show that (1) there are several sharp shrinkages up to 600 μ for early age concrete in the first 3 days; (2) the absolute value of shrinkage strain is larger than thermal strain; and (3) the difference of shrinkage strain under temperature variation or constant temperature is up to 500 μ.