wind farms it seems are also about concrete .. lots and lots of concrete
just throwing some numbers around
25m diameter ( radius 12.5m )
3.5m depth
volume = πr2h
1700m3
then let's scale up density ( 2.2 )
= 3700T in theory but halve it for the shape of the footing is not a perfect cylinder
of course even if we take out half that for reo it's still a mega pour of cement, sand and rock for each single wind turbine
and completely useless for any other purpose
structures of such freestanding height and not to mention the motion at the top, need over engineered foundations because of the tensile stress in addition to the load bearing aspect
looks like 2000T per turbine as per the following article
https://www.google.com/amp/s/reneweconomy.com.au/first-concrete-foundation-poured-in-australias-first-gigawatt-scale-wind-project/amp/
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