posted on Sep, 27 2009 @ 11:21 AM
Ya I just got through mixing and pouring a slab of 3500 bags of 80# each concrete and was actually thinking about this topic as I worked.Having this
in mind,I noted a couple things.Most importantly was the fact that really wet concrete is about ten times easier to work with.As in,I can stall my
mixer(double batches) if I add too much dry to a slurry like mix.And by too much,I;m talking about maybe a pound of dry,added to and stopping a mixer
which is churning along effortlessly containing 159#of concrete plus water weight.
Since I was doing a home made slab (23'X17'X5') and wasn't getting the big batch reddi mix truck,I didn;t go to any extreme in terms of forms.So I
was able to do things like using concrete itself to make an inner wall to fill with concrete the next day after it hardened a bit.A pyramid would
require surprisingly little in terms of forms compared to a vertical wall.And prob. reuseable.Woulden't need rebar either as the forc acting on it
would be compressive,not torsional or any real span loading.
Copper chisels could be used to correct any bumps in 'green'concrete before it hardened.
Why not build with both big stones and concrete(with little stones/rocks)infill?Still doesn't answer the three huge granite headers enigma.They
coulda used the 'swarf'from cutting the limestones for these concrete batches,forget about letting limestone just dissolve in water,it hadda been
ground up somehow.And mixed wet.,not allowed to just settle or there would be stratification as the smaller particles went to the bottom.I see pumping
or Archimedian type lift as fastest and easiest.Without UFO's of course.They'd be easiest.UFO's didn't help me,but there were a couple people
about whose function in life was a cause for wonder...no help tho