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Forced rebar corrosion for durability problems in calcium aluminate cement structures
The steel reinforcement corrosion behaviour in concrete prepared with Calcium Aluminate Cement (CAC) has been investigated by imposing an anodic constant current density to the steel bars. Based on previous experiences and reports the determination of time and current required the onset of mortar cracking was determined. Tests were carried out in mortar specimens with and without aggressive and inhibiting ions. Types of steel investigated were regular reinforcing (carbon) steel, stainless steel and zinc coated (galvanised) steel. Chloride ions were used as aggressive agents and nitrite ions as corrosion inhibitors. After imposing a 10 x 10-6 A/cm2 anodic current density for about 1000 hours, the final corrosion was determined and compared to the theoretical value calculated by Faraday's law in order to obtain the current efficiencies for each case. Results and conclusions are compared to those reported for ordinary Portland cement (OPC) mortars investigated under similar conditions. This comparison shows the different corrosion behaviour of steel in either type of cement.
Forced rebar corrosion for durability problems in calcium aluminate cement structures
The steel reinforcement corrosion behaviour in concrete prepared with Calcium Aluminate Cement (CAC) has been investigated by imposing an anodic constant current density to the steel bars. Based on previous experiences and reports the determination of time and current required the onset of mortar cracking was determined. Tests were carried out in mortar specimens with and without aggressive and inhibiting ions. Types of steel investigated were regular reinforcing (carbon) steel, stainless steel and zinc coated (galvanised) steel. Chloride ions were used as aggressive agents and nitrite ions as corrosion inhibitors. After imposing a 10 x 10-6 A/cm2 anodic current density for about 1000 hours, the final corrosion was determined and compared to the theoretical value calculated by Faraday's law in order to obtain the current efficiencies for each case. Results and conclusions are compared to those reported for ordinary Portland cement (OPC) mortars investigated under similar conditions. This comparison shows the different corrosion behaviour of steel in either type of cement.
Forced rebar corrosion for durability problems in calcium aluminate cement structures
Andion, L.G. (author) / Garces, P. (author) / Alcocel, E.G. (author) / Galao, O. (author) / Cases, F. (author)
2001
10 Seiten, 2 Bilder, 5 Tabellen, 16 Quellen
Conference paper
English
Forced Rebar Corrosion for Durability Problems in Calcium Aluminate Cement Structures
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