,

a

i

pr

i

pr

Where Ex and Ex ' - expenses on initial materials of concrete mix without

i

i

admixture and with admixture; Ex and Ex ' - other production expenses

pr

pr

on concrete mix without admixture and with admixture.

134

7.3. Calculations of basic parameters

of concrete mixture composition

Calculation of cement-water ratio.

Most widely used formula for determination of cement-water ratio (C/W) is

following:

R

= АR

cmp

c (C / W −

5

.

0 )

(7