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Air test questions on 0resund deck

SWEDISH ENGINEERS on the £1.4bn 0resund crossing between Sweden and Denmark spent Christmas on tenterhooks after doubts were raised over concrete quality on the recently completed eastern approach viaduct.

Freeze-thaw testing of cores cut from the concrete deck of the 25th composite viaduct section in November appeared to show a problem with entrained air content.

However according to an 0resundskonsortiet spokesman this week, initial results of more detailed tests carried out over the holiday period indicate that the problem is not as severe as first feared.

The Spanish-manufactured deck is constructed with a design life of 100 years and has chemical air-entraining agents added to the mix to improve durability. One in four of the sections are tested for long term resistance to freeze-thaw cycling and

de-icing salt attack.

But when three of the four cores tested in November failed, it appeared there was a serious problem with air content.

More tests were immediately ordered but as the test takes 56 days - and there was no problem with compressive strengths - the suspect section was placed on 17 November and the last of the 49 sections needed to complete the viaduct went in on 3 December. Other sections were also tested.

A spokesman for the project said on Tuesday that early indications were that the original test results overstated any potential problem. 'We won't have final results from all the tests until the end of this month, then we'll have a number of options open to us - including doing nothing at all.'

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