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Materials 2019, 12(5), 811; https://doi.org/10.3390/ma12050811

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

1
Architectural Engineering School, Jinhua Polytechnic, Jinhua 321007, China
2
School of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310023, China
*
Author to whom correspondence should be addressed.
Received: 18 February 2019 / Revised: 5 March 2019 / Accepted: 6 March 2019 / Published: 8 March 2019
(This article belongs to the Special Issue Sustainability in Construction and Building Materials)
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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. View Full-Text
Keywords: fly ash cement paste; chloride diffusion coefficient; effective medium approach; percolation theory fly ash cement paste; chloride diffusion coefficient; effective medium approach; percolation theory
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Zhou, H.; Zhou, X.-Z.; Zhang, J.; Zheng, J.-J. Effective Medium Method for Chloride Diffusion Coefficient of Mature Fly Ash Cement Paste. Materials 2019, 12, 811.

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