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Validation of service life performance of in situ concrete by TEM and RCM measurements

M.R. de Rooij1,2, R.B. Polder2, H.H. van Oosten3
1 Delft University of Technology, Faculty of Civil Engineering and Geosciences, Delft, The Netherlands
2 TNO Built Environment and Geosciences, Delft, The Netherlands
3 Engineering firm Movares, Utrecht, The Netherlands & Ministry of Transport and Watermanagement, Zoetermeer, The Netherlands

Nowadays important concrete infrastructure is increasingly being designed for long service life by probabilistic assessment of uncertainties, e.g. using the DuraCrete method. Although on paper a reliable and durable structure will result, it is the execution phase that can make or break the service life. Hence, testing the concrete for its durability during the actual production is necessary. This paper presents a study of non-destructive production control testing and service life achievement of cast in situ parts of the Green Heart Tunnel. Production control was performed by resistivity measurements using the Two Electrode Method (TEM). Validation consisted of measurements on cores taken after one to three years on site, which were tested using the Rapid Chloride Migration method. The results show that quality control by resistivity testing as carried out in this project was successful.

Key words: Rapid chloride migration, service life design, two electrode method, durability