SEDL / STP / STP1065-EB / STP25012S

Influence of Blast Furnace Slags on the Corrosion Rate of Steel in Concrete

Valentini, C
Research engineer, research engineer, and research chemist, Sector Electroquimica Aplicada, Instituto Nacional de Tecnologia Industrial, Pcia de Buenos Aires,

Berardo, L
Research engineer, research engineer, and research chemist, Sector Electroquimica Aplicada, Instituto Nacional de Tecnologia Industrial, Pcia de Buenos Aires,

Alanis, I
Research engineer, research engineer, and research chemist, Sector Electroquimica Aplicada, Instituto Nacional de Tecnologia Industrial, Pcia de Buenos Aires,

Pages: 12    Published: Jan 1990

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Abstract

The polarization resistance method was used to measure the corrosion rate of steel bars embedded in mortar specimens. The measurements were carried out on specimens, with different percentages of blast furnace slags (0, 20, 45, and 75% weight relative to the weight of cement). During the first 28 days, all the specimens were cured, immersed in water, and subsequently stored partially immersed at 50 and 100% relative humidity. In addition to the polarization resistance, the corrosion potential and ohmic resistance of the specimens were recorded. The influence of the different storage conditions and the percentage of furnace slags on the corrosion rate of steel bars embedded in the mortar are discussed. An analysis of the correlation between the measured parameters is presented.