Q. For the manufacture of Portland cement, the proportions of raw materials used, are (Solved)
1. Lime 63% ; silica 22% ; other ingredients 15%
2. Lime 22% ; silica 63% ; other ingredients 15%
3. Silica 40% ; lime 40% ; other ingredients 20%
4. Silica 70% ; lime 20% ; other ingredients 10%
- a. Lime 63% ; silica 22% ; other ingredients 15%