Sodium thiocyanate (NaSCN) is used in concrete as a setting/strength accelerator, mainly in cold weather.
Here are general industry guidelines (not a site-specific prescription):
Recommended Dosage (General)
Example
If cement = 100 kg
How to Use
Construction Industry : Sodium thiocyanate is used in the cement industry as an initial strengthening agent. The chemical enhances and strengthens bonding and acts as a grinding helper. Also, the use of sodium Thiocyanate prolongs the lifespan of cement. When preparing concrete, the chemical aidsin accelerating hardening. So, it’s a critical setting accelerator in concrete admixtures.