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Effect of temperature change on shrinkage strain of early concrete with time

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Document pages: 7 pages

Abstract: Shrinkage has been proved to be an important characteristic of early concrete. Shrinkage strain can lead to inherent engineering problems, such as cracking and prestress loss. Atmospheric temperature is an important factor affecting shrinkage strain. However, the current research does not pay much attention to the effect of atmospheric temperature on early concrete shrinkage. In this paper, a laboratory study was conducted to present the time-dependent shrinkage of early concrete under temperature change. The newly developed material deformation tester (MDT) is used to simulate the continuous change of atmospheric temperature and collect the shrinkage strain and temperature data of the sample. A numerical model describing the thermoelastic strain of materials is establisheden. 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.

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