Forum Message



Name: Chapin  Sipherd
Heading: 1.1.1.2.1RE:Density of fly ash
Message:
I am just checking the density of fly ash so I can transport it in a pneumatic tanker over the highway. How many pounds of dry fly ash powder would there be in a cubic foot?

Bob Mackintosh


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Bob Mackintosh


Fly ash is not as uniform a product as cement. We use an avereage value of 40#/CF for the silos we build.
Chapin
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Chapin Sipherd

The density will vary, so I''d contact a supplier or user in your area.
The Type F fly ash that we use in Arizona usually has a density of about 135lb/cu ft. Give or take.
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Christina Barnes



Depending on its specific gravity I would assume about 146 lb per cuft. Assuming a specific gravity of 2.30

Dan Larsen
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Dan Larsen

135lb/cu ft for fly ash is solid volume. You would use that value if you were designing a concrete mix. Hauling dry fly ash you have to take into account all of the voids between flyash particles. Typically I have seen 40 - 60 lb/ cu ft. I have never seen anyone go above 60lb/cu ft for dry fly ash calculations, but, there could always be the exception. I agree with Christina that you should call the fly ash company in your area.
Have them dust off their unit weight bucket and actually measure it.
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Jeremy Betts


Appreciate all the input here, I should have mentioned that it is Type C fly ash that I would be handling. If anyone can re-confirm the density for Type C fly ash that would be great. The thing I have to be careful with is the capacity & axle weights of the pnuematic tanker so I can get a 75,000 lb payload, and haul it legally.

Bob Mackintosh.
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Bob Mackintosh

Thanks for all of the responses,much appreciated. I will use a round figure of 50 lbs a cubic foot (approx) for type C flyash powder, my tankers are 1650 cubic feet capacity.

Bob Mackintosh
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Bob Mackintosh



Bob,
Are the tankers to be toploaded by gravity or pnumatically loaded? Makes a difference.
Pnumatic loading aerates the product, reducing the weight per cu. ft. It is not as
dramatic as cement but still quite a change in the weight/volume ratio. You need to do some test load weights before you go on the highway.
Chapin Sipherd
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Chapin Sipherd
 
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