Q49
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 . 3Al2O3
AnswerB.
3CaO . Al2O3
C.
3CaO . SiO2
D.
2CaO . SiO2
Answer: Option A
Solution
Answer: Option A
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