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Materials (Basel). 2019 Mar 8;12(5). pii: E811. doi: 10.3390/ma12050811.

Effective Medium Method for Chloride Diffusion Coefficient of Mature Fly Ash Cement Paste.

Author information

1
Architectural Engineering School, Jinhua Polytechnic, Jinhua 321007, China. 20050267@jhc.edu.cn.
2
School of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310023, China. xzzhou66@zjut.edu.cn.
3
School of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310023, China. jzhang777777@163.com.
4
School of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310023, China. jjzheng@zjut.edu.cn.

Abstract

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.

KEYWORDS:

chloride diffusion coefficient; effective medium approach; fly ash cement paste; percolation theory

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