Important points For Cement Clinker

1. An increase in lime content behind a certain values make it difficult to combine with other compounds and free lime will exits in the clinker which causes unsoundness in cement.
2. An increase in silica content at the expense of Alumina and ferric oxide will make the cement difficult to fuse and form clinker.
3. Normally cement generally produces 89 to 90 cal/g in 7days and 90 to 100 cal per gram in 28 days.
4. Hydration of cement continuous indefinitely at a decreasing rate. 
5. Calcium Hydroxide is soluble in water and gets leached out making the concrete porous. 
6. Tri calcium silicate readily react with water and produces more heat of hydration. It is responsible for early strength of concrete.
7. Tri calcium silicate make less C-H-S gel  and more calcium hydroxide compared to dicalcium silicate so for Hydraulic structure used cement with more dicalcium silicate content.
8. A cement with more tricalcium silicate content is better for cold weather concreting.
9. Di calcium silicate hydrates slowly, responsible for later strength of concrete it produces less heat of hydration.
10. The hydrates of Tetra calcium alumino-ferrite  has higher resistance to the attack of sulphates then the hydrates of tricalcium aluminate.
11. The hydrate aluminate do not contribute to the strength of concrete.
12. The reaction of pure tricalcium aluminate with water is very fast and this may lead to flash set to prevent this flash set gypsum is added at the time of grinding the cement clinker.
13. Presence of tricalcium aluminate is harmful to the durability of concrete where the concrete is likely to be attacked by the sulphates.
14. Calcium hydroxide reacts with sulphates present in soil or water to form calcium sulphate which further react with tricalcium aluminate and causes deterioration of concrete this is known as sulphate attack