Acta Mechanica Solida Sinica

, Volume 31, Issue 2, pp 161–173 | Cite as

Experimental and Theoretical Analyses on the Density and Modulus Development of Concrete Under Continued Hydration

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Abstract

In this paper, new models of the density and modulus development of concrete under continued hydration were studied. Experimental study was performed for different mixes of concrete. To avoid considering the effect of variation of Poisson’s ratio, the one-dimensional ultrasonic technique was adopted to detect the modulus development of concrete under continued hydration. The experimental results indicate the nonlinear characteristics of density and modulus evolution. At the initial stage of continued hydration, the density and modulus increase quickly, and then the increases slow down and finally tend to be constant. The mechanism of modulus enhancement is that the newly produced C–S–H gel in the continued hydration process not only leads to the decrease in porosity, but also repairs the initial defects of concrete. Based on this mechanism, simple differential equations for the density and modulus development of concrete were established by considering the chemical reactions of continued hydration, and new simple models for density and modulus development were proposed.

Keywords

Concrete Continued hydration Density development Modulus development Ultrasonic 

Notes

Acknowledgements

The authors would like to acknowledge the financial support by the National Natural Science Foundation of China (NSFC #11772164, #11272165, #11572163), the National Basic Research Program of China (973 Program, 2009CB623203), the Key Research Program of Society Development of Ningbo (2013C51007), and the K.C. Wong Magna Fund in Ningbo University. The authors were also supported by the Research Project Foundation of Zhejiang Educational Department (Y201636745).

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Copyright information

© The Chinese Society of Theoretical and Applied Mechanics and Technology 2018

Authors and Affiliations

  1. 1.The Faculty of Mechanical Engineering and MechanicsNingbo UniversityNingboChina
  2. 2.State Key Laboratory of Turbulence and Complex SystemsPeking UniversityBeijingChina
  3. 3.Department of Architectural EngineeringNingbo PolytechnicNingboChina

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