Title : CHLORIDE PENETRATION INTO CONCRETE – COMPARISON OF RESULTS FROM FIELD EXPOSURE TESTS AND LABORATORY TESTS
Authors : Henrik Erndahl SØRENSEN,Ulf JÖNSSON and Christian MUNCH- PETERSEN
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Price : 250
Abstract : 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) with different concrete mix designs and 15 small concrete blocks (1 x 1 x 0.2 m) with concrete mix designs matching the large blocks were produced in 2010 by the Danish Technological Institute (DTI is external concrete laboratory for Femern A/S). The large blocks were placed partly submerged in seawater in Roedbyhavn field exposure site and the small blocks were placed outside the laboratory. The 15 mix designs include concrete with three different cement types (two Portland cements and one blast furnace cement) and three different pozzolans (silica fume, fly ash and blast furnace slag). The field exposed concrete blocks will be monitored at least until the end of the construction period (2021). Chloride penetration profiles have already been measured after ½ years and 2 years field exposure in immersed zone and in splash zone. The results are presented and compared to results from accelerated laboratory testing of samples from the small blocks by the chloride migration test according to NT BUILD 492 at the maturity age of 1 month and 6 months.