Chemically Modified Water‐Glass Binders for Acid‐Resistant Mortars

Water-glass as a binder is used in acid and fire-proof applications. A chemical modification influences the curing rate or characteristics like the flexural and compressive strength. The aim of this work is to investigate the influence of the addition of C 3 S, C 3 A, and Na 3 (PO 3 ) 3 on the chemical durability of cured sodium silicate mortars. The results show that the addition of clinker minerals as accelerator reduces chemical durability and makes these binders unusable for acid-proof applications. The addition of Na 3 (PO 3 ) 3 makes the sodium silicate binder durable against water and acid attacks and triples the compressive strength.