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The main raw materials required for the ...

The main raw materials required for the manufacture of portland cement are

A

limestone and clay

B

limestone and gypsum

C

limestone and calcium chloride

D

limestone and silica

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To answer the question regarding the main raw materials required for the manufacture of Portland cement, we can break down the solution into the following steps: ### Step-by-Step Solution: 1. **Understanding Cement**: - Cement is a binder used in construction for setting, hardening, and as an adhesive to bind materials together. 2. **Identifying Portland Cement**: - Portland cement is a specific type of hydraulic cement, which means it hardens when mixed with water. 3. **Main Constituents of Portland Cement**: - The major components of Portland cement include: - Calcium oxide (CaO) - Silicon dioxide (SiO2) - Aluminum oxide (Al2O3) 4. **Source of Raw Materials**: - These major constituents are primarily derived from natural raw materials: - Limestone (which provides calcium oxide) - Clay (which provides silicon dioxide and aluminum oxide) 5. **Conclusion**: - Therefore, the main raw materials required for the manufacture of Portland cement are **limestone and clay**. ### Final Answer: The main raw materials required for the manufacture of Portland cement are limestone and clay. ---
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