Case Study #1: Cracking in Deck of Reinforced Concrete
Railway Bridge, Denmark
Problem: Structural cracking due to
alkali-aggregate reaction in 1-m thick reinforced deck
of railway bridge.
Results: Impact-Echo tests detected horizontal
cracking at mid-depth over entire span, a problem
unknown to the bridge engineers.
Verification: Cores (and mode of failure during
Outcome: Bridge judged unsafe and demolished.
When first hit with wrecking ball, lower half of deck
separated almost as one piece, and fell to the road
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