PCA-SRA is a liquid shrinkage-reducing admixture for concrete.
PCA-SRA can be used, in any Portland cement-based product to significantly decrease drying shrinkage.
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.