Cement chemist notation
From Wikipedia, the free encyclopedia
Cement chemist notation (CCN) was developed to simplify the formulas which cement chemists use on a daily basis. It is a sort of "short hand" way of writing the chemical formula of oxides of calcium, silicon, and various metals. Below is a list of all of the abbreviations used:
| CCN | Actual Formula |
|---|---|
| C | CaO |
| S | SiO2 |
| A | Al2O3 |
| F | Fe2O3 |
| T | TiO2 |
| M | MgO |
| K | K2O |
| N | Na2O |
| H | H2O |
 |
CO2 |
 |
SO3 |
These oxides are used to build more complex compounds such as:
| C3S | 3 CaO • SiO2 | Tricalcium silicate |
| C2S | 2 CaO • SiO2 | Dicalcium silicate |
| C3A | 3 CaO • Al2O3 | Tricalcium aluminate |
| C4AF | 4 CaO • Al2O3•Fe2O3 | Tetracalcium alumino ferrite |
Hydration products are more complicated, because many of the products have nearly the same formula and some are solid-solutions with overlapping formula. Some examples are below:
| C-S-H | 2(CaO) • SiO2 • 0.9-1.25(H2O) and/or CaO • SiO2 • 1.1(H2O) and/or 0.8-1.5(CaO) • SiO2 • 1.0-2.5(H2O) and more! |
| C-A-H | This is even more complex than C-S-H |
| AFt | C3A3H30-32 |
| AFm | C2AH12 |
The hyphens in C-S-H indicate a phase of variable composition, whilst CSH indicates a phase CaSiO4H2
[edit] References
- Locher, Friedrich W. (2006). Cement: Principles of production and use. Duesseldorf, Germany: Verlag Bau + Technik GmbH. ISBN 3-7640-0420-7.
- Mindess, S.; Young, J.F. (1981). Concrete. Englewood, NJ, USA: Prentice-Hall. ISBN 0-1316-7106-5.
