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The Interface Between Zinc Phosphate-Deposited Steel Fibers and Cement Paste

Published online by Cambridge University Press:  16 February 2011

Toshifumi Sugama  and
Gwen Gray
Toshifumi Sugama
Affiliation:
Brookhaven National Laboratory, Dept. of Applied Science, Upton, New York 11973, U.S.A.
Gwen Gray
Affiliation:
Massachusetts Institute of Technology, Dept. of Mechanical Engineering, Cambridge, MA 02139
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Abstract

In an attempt to protect steel fiber reinforcements from corrosion and improve the adherence of cement pastes to steel fiber reinforcement, we deposited a zinc phosphate (Zn-Ph) conversion coating on the surface of the fibers. At the interfacial contact zones between the cement paste and Zn.Ph, the alkali-induced dissolution caused the dissociation of abundant PO43- ions from the Zn-Ph. The interaction of PO43- ions with Ca2+ ions from the pastes led to the formation of hydroxyapatite and brushite in the vicinity of the dissolved Zn.Ph surface. Such intermediate Ca-phosphate compounds played important roles 1) in improving the cement-fiber interfacial bonds, and 2) in repairing the damage of the Zn.Ph surface dissolved by alkali. These processes protected the steel fiber from corrosion.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 211: Symposium O – Fiber-Reinforced Cementitious Materials , 1990 , 203
Copyright
Copyright © Materials Research Society 1991

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