Bogue’s Compounds or Portland cement compounds

 Bogue’s Compounds or Portland cement compounds

The setting and hardening of cement after addition of water is due to hydration of some of the constituent compounds of cement such as Tricalcium aluminate, Tricalcium silicate, Dicalcium silicate, and Tetra calcium aluminoferrite.

These compounds are known as Bogue’s Compounds.

Hydration of Bogues Compounds

Tricalcium aluminate (C3A) :-

Celite is the quickest one to react when the water is added to the cement. It is responsible for the flash setting. The increase of this content will help in the manufacture of Quick Setting Cement. The heat of hydration is 865 J/Cal.

Tricalcium silicate (C3S) :-

This is also called as Alite. This is also responsible for the early strength of the concrete. The cement that has more C­­­­3S content is good for cold weather concreting. The heat of hydration is 500 J/Cal.

Dicalcium Silicate (C2S) :- 

This compound will undergo reaction slowly. It is responsible for the progressive strength of concrete. This is also called as Belite. The heat of hydration is 260 J/Cal.

Tetra calcium Alumino ferrite (C4AF) :-

This is called as Felite. The heat of hydration is 420 J/Cal. It has the poorest cementing value but it responsible for long-term gain of strength of the cement.

For the rate of hydration is highest for C4AF and heat of hydration is highest for C3A.

From the above, the decreasing order of rate of hydration of Portland cement compounds is

C4 AF > C3 A > C3 S > C2 S.

For the heat of hydration, decreasing order of heat of hydration of portland cement is

C3 A > C3 S > C4 AF > C2S

Note: Heat of Hydration and Rate of Hydration is different

Question related to bogus compound

Which of the following shows the CORRECT decreasing order of rate of hydration of Portland cement compounds?

A) C3 A > C4 AF > C3 S > C2 S

B) C3 A > C4 AF > C2 S > C3 S

C) C3 A > C3 S > C2 S > C4 AF

D) C4 AF > C3 A > C3 S > C2 S

please answer this question in comment 

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