Concrete Products

JAN 2018

Concrete Products covers the issues that attract producers of ready mixed and manufactured concrete focusing on equipment and material technology, market development and management topics.

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22 • January 2018 www.concreteproducts.com NEWS SCOPE PRODUCERS LafargeHolcim Ltd. unit Holcim Deutschland formulated a series of high performance concretes for elements lining a 3.4-kilome- ter tunnel housing the world's most powerful X-ray laser. Located near Hamburg, Germany, the European XFEL generates extremely intense X-ray flashes researchers from around the world use to map atomic details of viruses, film chemical reactions, and study the processes in the interior of planets. Holcim Deutschland produced special- ized concrete for the extensive underground tunnel system, including easy-to-pump, heavy mixes for radiation shields and underwater placement. LafargeHolcim engi- neers developed additional mixes meeting European XFEL contractor requirements for reduced content of aluminum, natrum, silica and magnesium—common in portland cement and concrete but potentially inter- fering with highly sensitive measurements in the tunnel. Some concrete mixes required the use of special limestone chippings to attain particularly low silica levels. LafargeHolcim and its client carried out extensive chemical and physical tests for every concrete mix to ensure tunnel elements HPC mix designs heed laser tunnel aluminum, magnesium, silica sensitivity TUNNEL PHOTO: European XFEL

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