Sodium Thiocyanate in Concrete
CAS Number:540-72-7
EINECS Number:208-754-4
Chemical formula:CNNaS
PACKING:25KG/BAG
Molecular weight:81.0722
Sodium thiocyanate in concrete
Specification
Sodium thiocyanate (NaSCN) is used in concrete primarily as a set accelerator and early-strength agent.
Added at 0.3–2 % by weight of cement, it speeds up the hydration of C₃A and silicate phases, so concrete reaches ≥ 20 MPa one day earlier and allows rapid removal of formwork or molds.
|
Items |
Standard |
Result |
|
Appearance |
white crystal powder |
white crystal powder |
|
NaSCN Min %(Drying) |
95.0% Min |
97.6% |
|
PH value in water (50g/L) |
6.0-8.0 |
7.2 |
|
Clarity Test in Water |
Clarity |
Clarity |
|
Insoluble Substance in water |
0.02% Max |
0.001% |
|
Chloride(cl- ) |
0.08% Max |
0.03% |
|
Sulfate(SO42- ) |
0.08% Max |
0.06% |
|
Heavy metal (Pb) |
0.003% Max |
0.002% |
|
Iron(Fe) |
0.0003% Max |
0.0001% |
|
Water |
4.0% Max |
1.43% |
Application
Sodium thiocyanate is added to concrete as a powerful set accelerator and early-strength agent. At 0.3–2 % by weight of cement it shortens both initial and final setting times and raises one-day compressive strength by 30–50 %, allowing forms to be struck sooner and keeping winter pours on schedule. The salt lowers the freezing point of the pore solution, protecting fresh concrete down to about –5 °C, and is therefore widely used in cold-weather concreting, precast plants and rapid motorway or airport repairs where early traffic loading is critical. It also serves as a cement-grinding aid, improving mill output and the reactivity of the finished cement without sacrificing workability or late-age strength.
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