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2. Big Dig ceiling collapse - Wikipedia

   en.wikipedia.org/wiki/Big_Dig_ceiling_collapse

   Traffic crawls over a closed Fort Point Channel Tunnel entrance in Boston during rush hour on July 11, 2006, a day after the collapse.. The Big Dig ceiling collapse occurred on July 10, 2006, when a concrete ceiling panel and debris weighing 26 short tons (52,000 lb; 24,000 kg) and measuring 20 by 40 feet (6.1 by 12.2 m) fell in Boston's Fort Point Channel Tunnel (which connects to the Ted ...

3. Concrete degradation - Wikipedia

   en.wikipedia.org/wiki/Concrete_degradation

   Concrete carbonation can be visually revealed by applying a phenolphthalein solution over the fresh surface of a concrete samples (concrete core, prism, freshly fractured bar). Phenolphthalein is a pH indicator , whose color turns from colorless at pH < 8.5 to pink-fuchsia at pH > 9.5.

4. Surfside condominium collapse - Wikipedia

   en.wikipedia.org/wiki/Surfside_condominium_collapse

   According to that contractor, the images showed standing water, cracking concrete, and severely corroded rebar next to the pool. [ 188 ] On June 30, WLS-TV in Chicago publicized a bystander's video of water pouring into the parking garage from above near its entrance, and apparent concrete rubble lying on the floor, reportedly taken at 1:18 a.m ...

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