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The Diffusion of Chloride Ions in Fly Ash/Cement Pastes and Mortars

Published online by Cambridge University Press:  25 February 2011

R. I. A. Malek ,
D. M. Roy  and
P. H. Licastro
R. I. A. Malek
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
D. M. Roy
Affiliation:
Also affiliated with the Department of Materials Science and Engineering
P. H. Licastro
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
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Abstract

Fly ashes having three distinctly different levels of calcium, designated low-calcium (Class F), intermediate-calcium (Class F/C), and high-calcium (Class C), comprised the basic material for the present study. Pastes and mortars were made using cement and one of three types of fly ashes at various levels of replacement and water-solid ratios. Chloride ion diffusion was measured by applying an electrical potential across cured cylindrical samples and measuring the amount of current passed in a certain period of time (proportional to amount of CE” passed in this time). Other supportive measurements were made, e.g. porosity, pore size distribution, water permeability and surface area. The Cl− ion diffusivity was correlated with the chemical composition of fly ash, mix proportion, and water permeability of the hardened paste or mortar.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 85: Symposium M – Microstructural Development During Hydration of Cement , 1986 , 223
Copyright
Copyright © Materials Research Society 1987

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References

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