,

where η – viscidity of environment.

0

Experimental data permitted to L.I.Dvorkin and O.L.Dvorkin to write

down formula of viscosity of concrete mixture as follows:

η = К еηc.pϕz ,

(2

.4)

0

where η – viscosity of cement paste; ϕ –volume

c.t

z

concentration of aggregates in the cement paste; K –

0

proportion coefficient.

45

2.2. Technological properties of concrete mixtures

1 group

2 group

3 group

4 group

Fig. 2.6. Chart of methods of determination of structuralmechanical properties (workability) of concrete mixtures:

1 – cone; 2 –Skramtaev's method; 3–method Vebe;

4 – technical viscometer; 5 – Slovak method;

6 – modernized viscometer; 7 – English method;

8 – method of building NII; 9 – viscometer NIIGB

46

Formula of water balance of concrete mixture:

W = ХК C + К

S + К

St + В

+ В