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The faulty and spongy concrete that the Russians have discovered at the Vostochny Soyuz launchpad was caused when the contractor hurried the job as well as improperly laid the concrete.
“It was a mistake by the contractor Spetsstroi. The process of concrete laying was violated due to rush work,” the source said. “Spetsstroi laid the concrete in winter time in utterly unsuitable conditions and used drying fans.” The source said the cavities in concrete were identified more than a year and “continued to be eliminated by the public corporation itself until the contract with Adonis was concluded.
Part of the blame here falls not to the contractor but to Putin. He demanded that Roscosmos complete a launch at Vostochny in 2016, and to do so all the contractors at Vostochny had to scramble to get the job done. Apparently, this particular contractor was forced to cut corners improperly.