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16. MIXING BY HAND
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On a horizontal surface, free
of contaminants, such as oil, grease, loose sand, wood etc. Spread
a layer of sand with uniform thickness, which shall be used for
manufacture of the concrete a according to the Proportions Table. |
 On top of the layer
of sand, with a uniform thickness, place the amount of cement indicated
in the Proportions Table.
Add
the  , and mix with the existing paste until obtaining a
uniform concrete.
It
is of the utmost importance to respect the material amounts specified
in the Proportions Table. THE OBTAINED CONCRETE SHOULD NOT BELIQUID.
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