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  • Long term performance of corrosion resistant steel reinforcement in saline environment [Elektronski vir]
    Gartner, Nina ...
    Concrete structures, usually reinforced by carbon steel, require continuous maintenance and timely repair works in order to successfully fight the corrosion causing deteriorations and significantly ... reduced service life. Despite numerous anticorrosion protection methods, the use of stainless steel reinforcement is considered as one of the best methods for protection of reinforced structures exposed to aggressive environments. However, stainless steel reinforcement is still rarely used in practice. The main reasons for this are insufficient knowledge among designers and civil engineers about basic corrosion mechanisms of stainless steel in concrete and much higher price of stainless steel reinforcements (especially high-Ni alloyed steels), compared to commonly used carbon steel reinforcement. Literature survey and our past results obtained by accelerated laboratory tests on reinforcing steelin concrete pore solution show good qualitative comparison between different types of corrosion resistant steels. Laboratory measurements were continued on small concrete specimens with 6 different types of corrosion resistant steel reinforcements: ferritic TOP12-1.4003, austenitic low-Ni 204Cu-1.4597, austenitic AISI 304-1.4301 and 304L-1.4306, duplex SAE/UNS S3 2205-1.4462 and UGIGRIP 4362-1.4362. After 6 years of cyclic wetting with NaClsolution and measuring corrosion progress (galvanostatic pulse measurements, ER probes measurements), specimens were broken and final inspection (visual, microscopy, CT, etc.) of embedded steel and concrete itself was performed. Results of non-destructive measurements were compared tofinal (destructive) examination. The preliminary visual examination showed that all tested corrosion resistant steels (even ferritic TOP12) seem to be more suitable for the use in chloride contaminated environment than black steel. The step forward was to study corrosion behaviour of different corrosion resistant reinforcing steels (the same types as in laboratory concrete specimens) embedded in concrete columns and exposed in the scope of FP6 ARCHES project in the coastal area of Krk island (Adriatic sea, Croatia). During the exposure frequent measurements were performed on embedded reinforced steels: galvanostatic pulse measurements, ER probes measurements and CMEA measurements. After 4 years, concrete columns were transported to laboratory, where final (destructive) examination was performed as well. Basedon experiences from Krk test site, the new test site in Port of Koper (Slovenian coast) was established (FP7 TRIMM). Carbon steel reinforcement, austenitic low-Ni (204Cu-1.4597) and austenitic (AISI 304-1.4301) stainless steel reinforcements were embedded in two different types of concrete. Beside steel reinforcement, the exposed columns have embedded sensors for CMEA measurements and improved ER probes. In addition, new smart corrosion monitoring system with continuous wireless data acquisition was established. The real time results of ER probes measurements are already available on-line (http://corrosion-kp.zag.si/). The differences in corrosion resistance of individual type of steel reinforcement reflect in different maintenance costs and different expected service life of a structure. The outcome of the corrosion tests will serve as the input data for the study of economic viability of replacing usually used carbon steel reinforcement with more expensive corrosion resistant steel, taking into account the Life-Cycle Cost Assessment (LCCA).
    Source: Eurocorr 2015 [Elektronski vir] : earth, water, fire, corrosion happens everywhere (Str. 1)
    Type of material - conference contribution ; adult, serious
    Publish date - 2015
    Language - english
    COBISS.SI-ID - 2145895

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