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The effect of microsilica on the corrosion protection of concrete reinforcement
It has been demonstrated that microsilica assists in maintaining the passivity of concrete reinforcement, and enhances its resistance against the effect of harsh surrounding environments, even after long-term curing. The reduction in pH of the concrete mix associated with the inclusion of microsilica at dosages up to 15 %, as a cement replacement by mass, is far from sufficient to destroy the passivity of embedded-steel reinforcement. In addition, use of a superplasticizer with microsilica concrete assists in maintaining the pH value very close to that of the microsilica-free concrete. Microsilica in concrete increases its electrical resistivity. This, and its role in reducing the penetration of aggressive ions, are the main reason for the better corrosion resistance of steel in microsilica concrete. 10 % microsilica represents the optimum dosage to be used as a cement replacement in concrete on the basis of its role in retaining a high degree of steel passivity and combating the effects of highly-aggressive salts migrating from the surrounding media, an effect that is clearly evident in the long-term. Incorporating a superplasticizer in the microsilica concrete mix is beneficial in this respect, and is highly recommended.
The effect of microsilica on the corrosion protection of concrete reinforcement
It has been demonstrated that microsilica assists in maintaining the passivity of concrete reinforcement, and enhances its resistance against the effect of harsh surrounding environments, even after long-term curing. The reduction in pH of the concrete mix associated with the inclusion of microsilica at dosages up to 15 %, as a cement replacement by mass, is far from sufficient to destroy the passivity of embedded-steel reinforcement. In addition, use of a superplasticizer with microsilica concrete assists in maintaining the pH value very close to that of the microsilica-free concrete. Microsilica in concrete increases its electrical resistivity. This, and its role in reducing the penetration of aggressive ions, are the main reason for the better corrosion resistance of steel in microsilica concrete. 10 % microsilica represents the optimum dosage to be used as a cement replacement in concrete on the basis of its role in retaining a high degree of steel passivity and combating the effects of highly-aggressive salts migrating from the surrounding media, an effect that is clearly evident in the long-term. Incorporating a superplasticizer in the microsilica concrete mix is beneficial in this respect, and is highly recommended.
The effect of microsilica on the corrosion protection of concrete reinforcement
Der Einfluß von Mikrokieselsäure auf den Korrosionsschutz der Betonarmierung
El-Sayed, H.A. (Autor:in) / Ali, A.H. (Autor:in) / El-Sabbagh, B.A. (Autor:in)
Corrosion Prevention and Control ; 46 ; 101-107
1999
7 Seiten, 4 Bilder, 1 Tabelle, 10 Quellen
Aufsatz (Zeitschrift)
Englisch
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