,

Р

85

+ R

s

.

c

τ

where Pc.s - quantity of cement stone in the concrete (by mass).

Elastic properties of concrete can be characterized by static modulus of

elasticity (E) and by dynamic modulus of elasticity (E ) which taking into

d

account stresses and strains in specimen at vibrations.

Relationship between dynamic modulus of elasticity (E ) and

d

compressive strength of concrete (R

) is expressed by following

cmp

formula:

4 ⋅103R

Е

cmp

=

(5.5)