Portland Cement
| Oxide | Analysis | Formula | Tolerance |
|---|---|---|---|
| CaO | 62.28% | 0.95 | |
| MgO | 2.22% | 0.05 | |
| Al2O3 | 7.55% | 0.06 | |
| SiO2 | 22.65% | 0.32 | |
| Fe2O3 | 2.11% | 0.01 | |
| LOI | 3.20% | n/a | |
| Oxide Weight | 83.09 | ||
| Formula Weight | 85.83 | ||
Notes
Manufactured using limestone and shale. Powder is mixed and fired in a rotary kiln to near-stoneware temperatures. The clinker is finely ground to produce a grey powder that reacts with water to form a hydrous calcium silicate with some CaO left over.
Acids do attack cement however as soluble materials are removed less reactive remaining materials are quite stable.