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Calculated chloride penetration parameters. Please note that values for concrete types A, C and O in submerged zone and F in splash zone are uncertian due to suspect chloride profiles.

Calculated chloride penetration parameters. Please note that values for concrete types A, C and O in submerged zone and F in splash zone are uncertian due to suspect chloride profiles.

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Conference Paper
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Femern A/S, the Owner of the coming Fehmarnbelt Fixed Link, has built a marine field exposure site in the harbour of Roedbyhavn as a part of the preparations for the coming 17.6 km long immersed tunnel between Denmark and Germany, which will be the longest combined rail and road tunnel to date. A total of 15 large concrete blocks (2 x 1 x 0.2 m) wi...

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Citations

... The types of cement have notable impact on the concrete resistance to chloride ingress: slag cement [ fly ash (FA) cement [ silica fume (SF) cement [ ordinary Portland cement [42]. The apparent chloride diffusion coefficient and the critical chloride content for corrosion initiation decrease with increasing FA content in the binder [43]. ...
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... [1] and [2]. ...
... Calculated values of D a , C s and K Cr are given in Table 2 Values for D a and C s were obtained from chloride profiles measured on cores drilled from the submerged zone of the exposed concrete blocks. Similar data determined after 0.5 and 2 years of exposure [2] are shown as well for comparison. ...
... The improved resistance against chloride ingress as a result of using mineral addition such as slag, fly ash or silica fume has previously been confirmed in numerous studies (e.g. [2] and [6]). ...
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This paper presents new results from a long-running study following the chloride ingress in concrete blocks exposed at the marine exposure site located at Rødbyhavn harbour in Denmark. The site was established in 2010 as part of the preparatory work for the planned Fehmarnbelt fixed link between Denmark and Germany. Chloride profiles have previously been measured on cores extracted from the blocks after 0.5 and 2 years of exposure to seawater-and now after 5 years. The studied blocks represent 15 different concrete mixes produced using a variety of binder types. The chloride ingress in the blocks have been investigated for both submerged and splash zone exposure conditions. Chloride transport parameters such as the achieved chloride diffusion coefficient (D_a), surface chloride concentration (C s) and the penetration parameter K_Cr were determined by fitting the error function solution to Fick's 2nd law to the measured profiles. Results from the Rødbyhavn exposure site are also compared to chloride data from the field exposure site in Träslövsläge, Sweden. Based on the findings from Rødbyhavn and chloride data from the literature, a simplified chloride penetration model for long-term marine exposure is proposed and discussed.
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