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_____________________?

Alumina, silica, lime and iron oxide are the basic raw material for th

1.	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_____________________?
A.	5CaO. 3 Al2O3
B.	3CaO. Al2O3
C.	3CaO. SiO2
D.	2CaO. SiO2
Answer» B. 3CaO. Al2O3

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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_____________________?

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