Hi - hope you are doing well
Your program on PBS twice mentioned the use of fly ash in your concrete.
I think I understand the purpose of fly ash in concrete but can you please
tell me the concrete mix formula you prefer? I usually think of these things
in parts per cubic yard. One formula provided to me elsewhere is - 6 bag,
6 slump, and 6 fly ash, remainder in sand and preferred aggregate. My
preferred aggregate is 1/2 to 1 inch flint rock.
But i became interested in your formula after one of your guests mentioned
fly ash for a second time.
Thank you
Wayne
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Fly Ash addition
Hi Wayne,
The specifics of Fly Ash, where it comes from and why to use it are outlined in the following article http://www.buildinggreentv.com/keywords/cement/978 as Max mentioned.
Forget mix design for a second because you can add fly ash to virtually all mix designs. Whatever you mix design is, simply replace a portion of the cement with fly ash. It is generally accepted that up to 35% ash is beneficial for a variety of reasons including adding strenth to fully cured concrete.
We have experimented with many variations and find that replacing 30% of the cement with fly ash works best in our application.
A good source for Fly Ash is Boral Materials. Good Luck.
Janet
Coulee Concrete Designs, LLC
fly ash mix / formula
See if this helps, Wayne - I think I remember from that episode that most people use 30-35% fly ash. Eric Freed has also suggested that you check out FlyAsh.com
- maxmsf