Table 32 Major constituents of Portland cement and their specific properties

Compound

Chemical formula

Cement notation

Properties

Trica lciu m silicate

Dicalcium silicate

Tricalcium aluminate

Tetracalcium aluminoferrite

3CaO.SiO

2CaO.SiO

3CaO.Al2O3

4CaO.Al2O3.Fe2O3

C4AF

Rapid hardening giving early strength and fast evolution of heat

Slow hardening giving slow development of strength and slow evolution of heat

Quick setting which is retarded by gypsum

Rapid hardening and fast evolution of heat but lower final strength;

vulnerable to sulfate attack

Slow hardening;

causes grey colour in cement

Table 3.3 Typical compositions of Portland cements

Cement Class Composition Fineness (m2/kg)

Table 3.3 Typical compositions of Portland cements

Cement Class Composition Fineness (m2/kg)

Type

%C3S

4

Portland cement

42.5

55

20

10

8

340

52.5

55

20

10

8

440

White Portland cement

52.5

65

20

5

2

400

Sulfate-resisting Portland cement

42.5

60

15

2

15

380

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