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Latest ITER Newsline

  • Gravity supports | First production unit in China

    Bolted in a perfect circle to the pedestal ring of the cryostat base, 18 gravity supports will brace the curved outer edge of each toroidal field coil. These un [...]

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  • Naive question of the week | What happens to the car keys?

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  • Metrology | Facing the millimetre test

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  • Fusion research in Europe | Working it out together

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Of Interest

See archived articles

Warm concrete in the chilly dawn

Some 800 cubic metres of warm (14-17 °C) concrete were poured in the course of the 10-hour long operation. (Click to view larger version...)
Some 800 cubic metres of warm (14-17 °C) concrete were poured in the course of the 10-hour long operation.
Concrete pouring operations resumed early on Wednesday 22 January in the southern corner of the Tokamak Pit.

Two large concrete pumps, one equipped with a 58-metre extensible arm (the largest available in France), were mobilized to fill a 500 square-metre area with specially formulated concrete produced in the nearby batching plant.

Operations began at 4:00 a.m. and continued for 10 hours. This was the second segment (out of 15) poured for the Tokamak Complex basemat, and one of three that will support the future ITER Diagnostics Building.

Special measures were set into place to counter the early morning cold, such as producing warm concrete in the batching plant (by heating the water and gravel) and using plastic sheeting as the work progressed to avoid too rapid cooling.

The thick fog blanket that covered the ITER site added to the eerie atmosphere of the early dawn operations. (Click to view larger version...)
The thick fog blanket that covered the ITER site added to the eerie atmosphere of the early dawn operations.
Hot air blowers were also activated once the pour was complete to regulate the drying process.

The complete Tokamak Complex basemat (1.5-metre-thick) is scheduled to be in place in July. Work will resume next week on the rebar installation in the central area of the Tokamak Pit.



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