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Old 03-07-2018, 05:46 PM
Matt W Matt W is offline
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Join Date: Sep 2009
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Quote:
Originally Posted by Gelrir View Post
cement kiln: Portland cement needs clay, shale, limestone and gypsum ... and a lot of heat.

----------------SNIP---------------------

1.5 tons of quicklime (plus the other components) results in (about) 2 tons of portland cement. To make a cubic meter of concrete, mix:
  • 307 kg of cement
  • 926 kg of sand
  • 950 kg of aggregate (typically gravel)
  • 163 liters of fresh water

Thus a cubic meter of concrete requires at least 46 kg of coal to be burned ... probably twice that much, since the rotary kiln needs to be pretty hot, also. That brick kiln is one of of a process that creates 6.5 cubic meters of concrete each day.

Our (classic-setting) campaign has some more info on the process: http://asmrb.pbworks.com/w/page/1131...neering#cement

--
Michael B.
But why not use the concrete that you already have? Concrete can be recycled. And - with the right techniques - rubble can be turned into useful building material

https://www.smithsonianmag.com/innov...mes-180960663/
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