In view of the importance of the interfacial transition zone (ITZ) to the macro-properties of concrete, it is essential to determine the ITZ area fraction in concrete. Once the ITZ area fraction is known, the physico-mechanical properties of concrete can be predicted based on the three-phase composite model. The intention of the present paper is to develop a numerical algorithm for the ITZ area fraction in concrete with elliptical aggregate particles. By introducing a contact function for two ellipses, the elliptical aggregate particles with various sizes are distributed within a square element with periodic boundary conditions. The Monte Carlo method is then adopted to evaluate the ITZ area fraction. After verifying the developed numerical algorithm with the analytical solution for the ITZ area fraction in concrete with circular aggregate particles, the effects of key factors that affect the ITZ area fraction are examined in a quantitative manner. It is found in the paper that the ITZ area fraction increases with the increase of the ITZ thickness, but decreases with the increase of the maximum aggregate diameter and the ratio between the major and minor axes of elliptical aggregate particles. It is also found that the aggregate gradation has a significant influence on the ITZ area fraction. The paper concludes that the numerical algorithm presented in the paper can predict the ITZ area fraction with reasonable accuracy.
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March 2009
Research Article|
March 01 2009
A numerical algorithm for the ITZ area fraction in concrete with elliptical aggregate particles Available to Purchase
J.J. Zheng;
J.J. Zheng
*
Zhejiang University of Technology; Dalian University of Technology; Zhejiang University
* Faculty of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, PR China.
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F.F. Xiong;
F.F. Xiong
*
Zhejiang University of Technology; Dalian University of Technology; Zhejiang University
* Faculty of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, PR China.
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Z.M. Wu;
Z.M. Wu
†
Zhejiang University of Technology; Dalian University of Technology; Zhejiang University
† State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, PR China.
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* Faculty of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, PR China.
† State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, PR China.
‡ Faculty of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310027, PR China.
Publisher: Emerald Publishing
Revision Received:
March 31 2008
Received:
July 18 2008
Accepted:
July 18 2008
Online ISSN: 1751-763X
Print ISSN: 0024-9831
© 2009 Thomas Telford Ltd
2009
Magazine of Concrete Research (2009) 61 (2): 109–117.
Article history
Revision Received:
March 31 2008
Received:
July 18 2008
Accepted:
July 18 2008
Citation
Zheng J, Xiong F, Wu Z, Jin W (2009), "A numerical algorithm for the ITZ area fraction in concrete with elliptical aggregate particles". Magazine of Concrete Research, Vol. 61 No. 2 pp. 109–117, doi: https://doi.org/10.1680/macr.2007.00123
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