Shear strenght of dry Portland Cement 2

[kellnerp]

I am looking for the shear strength of dry Portland Cement. In other words it's shear strength as is sits in the bag before being mixed with water.

TIA

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[BigH]

I would suppose a lot depends on the grind - how fine it has been produced to. Any info on that as this would be one controlling factor? In India (and I think UK), they have OPC33, OPC43 and OPC53 - with the later being much more finely ground.

 

[StephenA]

My ancient Reynolds (Reinforced Concrete Designer's Handboook) gives the following for contained cement.

Cement Static fine Theta 10 degrees, Angle of repose 15 degrees

Static coarse Theta 18 degrees Angle of repose 20 degrees.
Density 1440kg/m3

Air-agitated Theta 0 and density 1120kg/m3

 

[kellnerp]

StephenA,

Can you give the citation for Reynolds? It would be appreciated.

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[StephenA]

The book is called Reinforced Concrete Designer's Handbook Seventh Edition (Revised) by Chas. E. Reynolds BSc. (Eng), C.Eng, F.I.C.E. published by Cement and Concrete Assocation (first edition 1932, Seventh Edition 1972).

It has been revised many times since!

 

[BigH]

You can also check out:

http://www.melcoconveyors.com/Material Characteristics/Material Characteristics.htm

They indicate angle of repose is 40 to 44 degrees. I don't understand what they mean by angle of surcharge which is approximately 1/2 of this - perhaps saturated angle of repose?

 

[kellnerp]

I don't understand what they mean by angle of surcharge which is approximately 1/2 of this - perhaps saturated angle of repose?

Your link got me to searching and I found this for example:

Trajectories Classification

Depending on who you look at the angle of repose can be anything from 44 degrees to maybe -15.

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