Basics of Concrete Science by Professor L. Dvorkin, Professor O. Dvorkin - HTML preview
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,
(4.
5)
Ax
where R-strength of concrete; k – strength coefficient, A – constant value,
x – ratio between volume of water and volume of cement.
Graf offered at the end of 20th years of 20 century the formula of
concrete strength (specifying the Abrams formula for practical
calculations) as follows:
R
R
c
= А(W/C)