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Back in the early 1970s I was sharing a house up North with a couple of friends, one of whom was employed as a technician on motorway construction. One day Steve came home not his usual carefree self, and told us that he had been testing the grout, a mixture of cement and sand in water, that was used to surround cables embedded in concrete, in order to seal them from the elements. Finding a batch that was not of the proper consistency - I think it was meant to be cement-rich - he had reported this, only to be told to let it go.
Steve explained that if the cables were not properly grouted and sealed, rainwater permeating through the concrete would cause them to rust, and you might eventually have lumps of loosened masonry from bridges falling down on to the motorway.
I told him somewhat naievely that he ought to go to the press with his story. He replied that if he did that "it would be the end of my career in civil engineering and construction". He was probably right. He won't mind me telling his story now, as last thing I heard he had gone into teaching instead.
. . . visual inspection augmented with the use of a bore scope, use of impact echo testing, an evaluation of corrosion potentials, and an assessment of chloride contamination. It is now known that this approach has not always identified ongoing corrosion and has actually provided a false sense of security while tendons continue to corrode.
Bridge was 'undergoing repairs' Reports are suggesting that the bridge was undergoing repairs before the collapse. It is still not known what triggered the disaster however.
originally posted by: Kester
a reply to: penfold
Blatant thief in Hi Vis robbing the truck at 00:28.
This is a simple and predictable symptom of years of government devolvement of public infrastructure and sell off's.
quite true. shock loading of any structure the stresses go haywire and can cause unexpected failures
originally posted by: Astyanax
a reply to: LABTECH767
This is a simple and predictable symptom of years of government devolvement of public infrastructure and sell off's.
It’s an accident. A minor accident that didn’t really hurt anyone.
For heaven’s sake grow a sense of proportion.