Question: Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of Portland cement. The component of Portland cement which first hardens

Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of Portland cement. The component of Portland cement which first hardens is

5

CaO.

3

2

3

3

CaO. Al

2

3

3

CaO. SiO

2

2

CaO. SiO

2

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