,

к

Vw

where V – volume of entrained air voids, %; V

– volume of concrete

air

contr

voids occurring as the result of cement contraction, %; V - volume of

w

water freezing at -200C in the concrete.

111

The equation of the compensatory factor can be modified as follows:

V

10

+ ,

0 06αC

F

air

=