effective medium method
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Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 811 ◽  
Author(s):  
Hong Zhou ◽  
Xin-Zhu Zhou ◽  
Jian Zhang ◽  
Jian-Jun Zheng

The chloride diffusion coefficient of concrete plays an essential role in the durability assessment and design of concrete structures built in chloride-laden environments. The purpose of this paper is to present an effective medium method (EMM) for evaluating the chloride diffusion coefficient of mature fly ash cement paste. In this method, a numerical method is used to estimate the degrees of hydration of cement and fly ash. Fly ash cement paste is then modeled as a two-phase composite material, composed of a solid phase and a pore space. By introducing the percolation theory, the EMM is modified to derive the chloride diffusion coefficient of fly ash cement paste in an analytical manner. To verify the EMM, a chloride diffusion test of fly ash cement paste at a curing age of up to 540 days is conducted. It is shown that, within a reasonable fly ash content, a larger fly ash content and/or curing age results in a smaller chloride diffusion coefficient. The chloride diffusion coefficient decreases with a decreasing water/binder ratio. Finally, the validity of the EMM is verified with experimental results.


2010 ◽  
Author(s):  
V. Raulot ◽  
B. Serio ◽  
P. Gérard ◽  
P. Twardowski ◽  
P. Meyrueis

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