),

13)

shr

+

1+ m

A.Velmi

W/C – water – cement ratio; C – quantity of cement, kg per cubic

meter; m-mass ratio between aggregates and cement

102

ete

ncr

f co

stea

Along with drying shrinkage,

ge o

nt p

concrete is exposed to

f ceme

carbonation shrinkage due to

n shrinka

e o

carbon dioxide which presents in

an air. Carbon dioxide reacts with

tweee rinkag

the products of hydration of

h

cement and that is accompanied

tio ba

Volume quantity of aggregates, %

R

and s

by the increase of general

Fig. 5.9. Effect of volume quantity of

shrinkage of concrete.

aggregates on ratio between

shrinkage of concrete and shrinkage

of cement paste

Thermal shrinkage is caused by the decrease of the temperature of

concrete. The high changes of temperature in summer and in a winter can

be a reason of concrete changes of unit length to 0.5 mm per m.

103