PCA-SRA is not an expansive material, but rather functions by blocking capillaries of pore water, which is the major mechanism that causes drying shrinkage in concrete. PCA-SRA when added to concrete at a rate of 2 % by weight of cementitious 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.

Advantages:

- High level of shrinkage reduction that can eliminate cracking due to drying shrinkage in restrained concrete

- Reduces potential for cracking

- Improves aesthetics

- Increases water tightness of the mix

- Improves durability of the concrete

- Reduces creep and curling of slabs

- Decreases carbonation at the surface of slabs