Composition Flashcards
1
Q
Highest percentage component present in cement ?
A
Lime
2
Q
Lime percentage in cement
A
62-65%
3
Q
2nd highest component in cement
A
Silica
4
Q
Percentage of silica in cement
A
17-25%
5
Q
What is the function of lime in cement
A
Imparts strength and soundness
6
Q
What happens when lime is deficient in cement
A
Quick setting
Reduced strength
7
Q
What happens when lime is present in excess in cement
A
Unsoundness causing it to
Expand and disintegrate
8
Q
Alumina in cement imparts which property
A
Quick setting time
9
Q
Excess alumina in cement causes
A
Weakens the cement
Reduce clinkering temperature
10
Q
Calcium sulphate is present in which form in cement
A
Gypsum
11
Q
Function of gypsum in cement
A
Increases initial setting time
