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Simulated de-icing salt exposure of blended cement concrete - corrosion aspects
Concrete prisms were made with four cement types including cements with fly ash and/or blast furnace slag and three water-to-cement ratios. Chloride penetration and corrosion of rebars were stimulated by cyclic loading with salt solution and drying. Concrete resistivity, steel potentials and corrosion rates were measured periodically. Chloride penetration profiles were determined after salt loading. It was found that the resistivity of a particular concrete reflects its properties with regard to chloride penetration, corrosion initiation (probability of corrosion) and corrosion propagation (corrosion rate) under the applied conditions. Blending the cement with blast furnace slag, fly ash or a combination of these is beneficial with regard to delaying the onset of corrosion and subsequently limiting the rate of corrosion under simulated de-icing salt load. The fly ash cement shows increased resistivity compared to Portland cement from eight weeks age. Blast furnace slag develops a significantly higher resistivity on the time scale of one week. The investigated cement with both slag and fly ash had favourable corrosion protection properties.
Simulated de-icing salt exposure of blended cement concrete - corrosion aspects
Concrete prisms were made with four cement types including cements with fly ash and/or blast furnace slag and three water-to-cement ratios. Chloride penetration and corrosion of rebars were stimulated by cyclic loading with salt solution and drying. Concrete resistivity, steel potentials and corrosion rates were measured periodically. Chloride penetration profiles were determined after salt loading. It was found that the resistivity of a particular concrete reflects its properties with regard to chloride penetration, corrosion initiation (probability of corrosion) and corrosion propagation (corrosion rate) under the applied conditions. Blending the cement with blast furnace slag, fly ash or a combination of these is beneficial with regard to delaying the onset of corrosion and subsequently limiting the rate of corrosion under simulated de-icing salt load. The fly ash cement shows increased resistivity compared to Portland cement from eight weeks age. Blast furnace slag develops a significantly higher resistivity on the time scale of one week. The investigated cement with both slag and fly ash had favourable corrosion protection properties.
Simulated de-icing salt exposure of blended cement concrete - corrosion aspects
Polder, R.B. (author) / Peelen, W.H.A. (author)
2000
10 Seiten, 6 Bilder, 8 Tabellen, 6 Quellen
Conference paper
Storage medium
English
Simulated de-icing salt exposure of blended cement concrete - chloride penetration
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