Bogue's Compounds ( Concrete Technology )

• Introduction

Bogue's compounds are the main components of cement.After the application of water in cement these compounds starts reacting with water, those reactions are known as hydration reaction and the phenomenon is known as hydration of cement.

Due to this hydration cement paste become hardened and get strength. List of the Bogue's compounds are given below -

• Discussion

C3S ( Alite ) - 

1. It  is  responsible for early strength of cement.

2. First 7 day strength of cement is due to C3S.

3. It produce more heat of hydration than C2S.

4. Cement with more C3S content is preferred in cold Countries.

C2S ( Belite ) -

1. C2S take part in Hydration reaction after 7 days.

2. It hydrates slowly and gives strength after 7 day.

3. C2S is responsible for ultimate strength.

4. It produce less heat of hydration.

C3A - 

1. C3A reacts first with water and produce huge heat of hydration which results in quick setting of cement which is known as Flash Setting.

2. To prevent flash setting 2 to 3% of Gypsum is added to cement during grinding operation gypsum act as retarding agent.

3. Hydration of C3A does not contribute in strength of cement.

C4AF - 

 

1. C4AF hydrates rapidly.

2. It dose not contribute in strength of cement.

• Some Important Points For Competitive Exams

1. C3A Reacts with water first after adding water into cement.

2. C3S is responsible for 7 day strength.

3. C2S is responsible for 28 day strength.

4. Maximum heat of hydration is produced by C3A.

5. C3A is responsible for flash setting.

6. Gypsum ( CaSO4,2H2O ) is a retarder it prevent Flash Setting.