Bogue’s Compounds
Following are the four compounds which are known as bogues compounds and their formula & abbreviated formula are described below:
| Name of Bogues Compound | Abbreviated Formula | Formula |
| Tri-calcium silicate | C3S | 3 Cao.Sio2 |
| Di-calcium silicate | C2S | 2 Cao.Sio2 |
| Tri-calcium aluminate | C3A | 3 Cao.Al2o3 |
| Tetra-calcium alumino-ferrite | C4AF | 4 Cao.Al2o3.Fe2o3 |
Properties and Function of Bogue’s Compounds
The Bogue’s compounds (basic compounds) of Ordinary Portland Cement and their function are given below:
| Bogue’s Compounds | % by mass of cement | Properties & Function of bogue’s compounds |
| Tri-calcium silicate (C3S) | 25-50 | It hydrates at a faster rate and produces higher heat of hydration. It is responsible for rapid hardening with an early gain in strength & has less resistance to chemical attack. |
| Di-calcium silicate(C2S) | 20-45 | It hydrates & hardens slowly and produces less heat of hydration. It provides much of the ultimate strength & has greater resistance to chemical attack. |
| Tri-calcium aluminate(C3A) | 5-12 | It is the first compound which starts hydrating. It produces the highest heat of hydration & responsible for the setting of cement. |
| Tetra-calcium alumino-ferrite (C4AF) | 6-12 | It hydrates rapidly but its individual contribution to the overall strength of cement is insignificant. |
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