Naslov
Service Life Prediction in Comparison with On-Site Results from 25-Year-Old Concrete Structure

Autori
Bjegović, Dubravka ; Stipanović, Irina ; Mikulić, Dunja

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Proceedings of ACI Spring 2005 Convention / - New York (NY), 2005

Skup
ACI Spring 2005 Convention: Concrete Soars, Spans & Supports New York and New Jersey

Mjesto i datum
Sjedinjene Američke Države, 17.04.2005. - 21.04.2005

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
chlorides; chloride diffusion coefficient; corrosion; marine environment; numerical modelling

Sažetak
Durability of reinforced concrete is primarily determined by the penetration of aggressive substances into concrete, which are degrading concrete and reinforcement. For structures in marine environment and objects on roads where the pavement is strewed with salt in conditions of continental winters, chlorides are the critical environmental load. In this paper results of experimental and numerical analysis, regarding chlorides as an external load, from 25-year-old reinforced concrete structure will be presented. This structure was a part of the yacht marine at the Adriatic coast, meaning it was exposed to very agressive marine environment for more than two decades. Due to reconstruction columns were pulled out from the sea and became accessible for the testing. After visual inspection these elements were divided into 5 different zones of exposure. More than 200 chloride analysis were performed, both with on site and standard laboratory measurement techniques. On the basis of these results chloride diffusion coefficient was calculated and compared with numerical predictions, used in numerical models for service life prediction. Two numerical models for service life prediction will be applied on this structure, Life-365 and Chlodif. The last one was developed at the Faculty of Civil Engineering, University of Zagreb. Numerical models, discussed in this paper, compute the required initiation period through the analysis of chloride ions diffusion in a semi-infinite medium. The influence of different surface chloride concentration and concrete properties on the service life are obtained. The results from the field are compared with the computational analysis.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo, Temeljne tehničke znanosti

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