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Widespread defective or missing concrete or reinforcing steel revealed

Steel News - Published on Tue, 15 Oct 2019

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New imaging technology has revealed hundreds of major buildings nationwide have defective or missing concrete or reinforcing steel. Concrete investigators say their scanning shows many buildings have not been constructed according to the plans. They were "astounded" and "appalled", Jane Roach-Gray of Wellington company Concrete Structure Investigations said.

It is using ultrasound technology developed with Crown agency Callaghan Innovation, to look up to two metres inside concrete columns, beams, walls and floors.

The technology is "pioneering", Dr Paul Harris of Callaghan Innovation said. They also use ferro-scanning and ground-penetrating radar.

Ms Roach-Gray said that critical structural parts were defective or missing in 1100 of the 1200 buildings they had scanned since 2016. She said that "The divide occurs between what's in the plans and what ends up in the structure. Some key structural elements are not going in correctly or they're not going in at all, and of course, once they're covered up with concrete, we - any of us - don't know what's actually gone into the building."

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Posted By : Rabi Wangkhem on Tue, 15 Oct 2019
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