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Cement Chemistry

Total questions: 15

Worksheet time: 10mins

Name
Class
Date
1.

How many grades of OPC cements are there?

a)

a) 1

b)

b) 2

c)

c) 3

d)

d) 4

2.

How is concrete tested for its strength?

a)

a) By pouring into cubes

b)

b) By making slabs

3.

Free CaO in cement comes from?

a)

Limestone

b)

Shale

c)

Clay

d)

Gypsum

4.

In the figure below, what does ‘a’ represents?

a)

a) Combustion chamber

b)

b) Wash mill

c)

c) Kiln

d)

d) Dryer

5.

How much does a bag of cement weigh?

a)

a) 1 kg

b)

b) 10 kg

c)

c)50 kg

d)

d)100 kg

6.

What is released during the production of clinker?

a)

a) CaCO3

b)

b) CO2

c)

c) Ca(OH)2

d)

d) CO

7.

Which stone provides the calcareous component required for the manufacture of cement?

a)

a) Lime

b)

b) Limestone

c)

c) Marble

d)

d) Granite

8.

LSF>100% causes (a)  

9.

The components of clinker are called (a)   compounds

10.

What compound is called a set regulator

(a)  

11.

________ is formed when C3A reacts with gypsum

a)

AFt

b)

AFm

c)

CH

d)

CSH

12.

Flash set occurs when

a)

CH reacts with water

b)

CSH reacts with water

c)

C3A reacts with gypsum

d)

C3A reacts with water

13.

What precipitates during false set?

a)

Gypsum

b)

Ettringite

c)

Monosulphate

d)

Portlandite

14.

What is the pH of cement?

a)

7.5

b)

9

c)

8.5

d)

13

15.

CH is deposited at the (a)   (short form)