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Match List-I with List-II and choose the correct answer from the options given below.

 

List-I

 

List-II

A.

 Water and Cement 

a.

 Fast in Reaction 

B.

 Tri Calcium Silicate

b.

 Slow in Reaction

C.

 Di-Calcium silicate

c.

 Slowest in Reaction 

D.

 Tri Calcium Aluminate 

d.

 Hydrates


1. A - d, B - a, C - b, D - c
2. A - d, B - b, C - c, D – a 
3. A - c, B - b, C - a, D - d
4. A - a, B - c, C - b, D - d

1 Answer

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Best answer
Correct Answer - Option 2 : A - d, B - b, C - c, D – a 

Explanation:

  • When Water and Cement mix, heat is generated. This process is known as Hydration.
  • Hydration is a chemical reaction in which the major compounds in cement form chemical bonds with water molecules and become hydrates or hydration products.
  • Major compounds of cement clinker (also known as Bogues compounds) are:

 

Bogues compounds

Properties

Tetra-calcium alumino-ferrite(C4AF)

  • Formed within 24 hours of the addition of water
  • The High heat of hydration in initial periods

Tri-calcium aluminates(C3A)

 

  • Formed in 24 hours of the addition of water
  • Max. evolution of heat of hydration
  • Reduce the setting time of cement

Di-calcium silicate(C2S)

 

  • Last compound formed during the hydration of cement
  • Responsible for progressive later stage strength
  • The Proportion of this increase in hydraulic structures, bridges, etc.

Tri-calcium silicate(C3S)

 

  • Formed within a week
  • Responsible for initial strength of cement
  • Contribute about 50-60% in cement

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