Basics of Concrete Science by Professor L. Dvorkin, Professor O. Dvorkin - HTML preview
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,
(5.2)
S + Rτ
where Rτ - compressive strength (MPa) of concrete specimens - cubes
after definite age of hardening (τ); E and S – constant values
m
(E = 52000; S = 23).
m
Following equation is recommended by a European concrete
committee:
E = С(R )γ
,