RussTech shrinkage-compensating admixture significantly decreases drying shrinkage in all Portland cement based mixtures. It is not expansive material, but rather functions by blocking capillaries of pore water, which is the major mechanism that causes drying shrinkage in concrete. Shrinkage-compensating admixture, when added to concrete at a rate of 2 % by weight of cementitious material, can reduce shrinkage (ASTM C 157) by up to 80% at 28 days of age and by up to 50% at one year of age.

                                 SRA-157