MasterLife SRA 21 - High performance shrinkage reducing agent 

Formerly: Tetraguard AS 21

How does MasterLife SRA 21 work?

MasterLife SRA 21 is a ready to use liquid admixture formulated to greatly reduce the drying shrinkage of any concrete. 

What is MasterLife SRA 21 used for?

MasterLife SRA 21 is recommended for all types of concrete where a reduction in drying shrinkage is required. Examples include: 

  • Slab-on-ground concrete. 
  • Concrete structures subject to marine and/or chemical environments.
  • Industrial pavements. 
  • Pre-stressed elements. 
  • Tunnel linings. 
  • Bridge girders. 
  • Watertight and water retaining structures. 
  • Concrete pipes. 
  • Manufactured concrete products. 

What are the advantages of MasterLife SRA 21?

Pore water capillary tension is the major contributor to the drying shrinkage of concrete. MasterLife SRA 21 reduces the drying shrinkage of concrete by reducing the capillary tension of the pore water in concrete. Reductions in drying shrinkage of up to 50% have been obtained using MasterLife SRA 21. The benefits derived from the reduction in drying shrinkage include: 
  • Dramatic reduction in crack occurrence caused by drying shrinkage. 
  • Increased joint spacing in concrete pavements and slab-on-ground. 
  • Improved concrete durability. 
  • Longer service life. 

Product Information


Central Region
+966 11 2790971
Western Region
+966 12 6394799
+966 12 6395702
Eastern Region
+966 13 8084896
South Region
+966 17 2748255
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