,

where A – amplitude of vibrations; W – frequency of vibrations.

52

mm

sm2/sec3

Hz

Fig. 2.9. Relationship between amplitudes (A)

and frequency of vibrations (W ) of a different

intensity of vibration (I)

Duration of vibration (τ) for no-slump mixtures is offered to calculate by

formula:

τ = α Vb І / І

, (2

.13)

c

u

where Іu – minimum intensity of vibrations of mixture in the construction; І –

intensity which workability (Vebe) of mixture is determined (Vb); αc – coefficient

relying on configuration of construction and degree of its reinforcement.

53