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Norwegian National Seismic Network (NNSN): Concrete casting of seismometer vault 11 January, 2013. Project information (in Norwegian only): http://nnsn.geo.uib.no/eworkshop/index.php?n=Main.Hardangervidda
* 2.5m3 ready-mixed concrete ordered.
* Strength: “B30″ = 30MPa.
* Workability: “M60″.
* Chemical admixtures: Accelerator to speed up the hardening, anti-freeze (it was -16 deg C).
* Aggregates: Sand, 0-4mm.
* The concrete MUST be vibrated in order to avoid pockets of air under tank bottom
* After casting is finished, knock on tank bottom with stone to detect any cavities, while there is still time to remove them.
In my view the excavator driver is an artist – judge for yourself! He complained the low temperature affected the hydraulics, making the controls less precise. I wouldn’t be surprised if the excavator shovel was used as car ice scrape, though.