Question

The silica in Portland cement should be

• A. 10 to 20%
• B. 20 to 25 %
• C. 25 to 40%
• D. 40 to 60%

Answer 1

Answer:

B. 20 to 25 %

Percentage of main ingredients in Cement Lime -63%, Alumina -6%, Iron Ox-ide -3%, Magnesium Oxide - 2.5% and Calcium Sulphate (Gypsum)- 3 to 4%