,

88

.

(9.3)

a

.

с

a

.

с

Where R

is strength of expanded clay gravel; ρb

is bulk density of

c.a

c.a

expanded clay gravel.

Maximal possible density of coarse porous aggregate at volume concentration

of porous aggregate ϕ=const is limited by concrete density (ρ ) and density of

c

their mortar component. It can be found from the equation:

ρс = ρ a.

с ϕ

+ ρm(1− ϕ)− W

(9.4