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Q: Which of the following materials is primarily composed of calcium carbonate and is commonly used as a building material?
  • A. Concrete
  • B. Brick
  • C. Steel
  • D. Limestone
Correct Answer: Option D - Lime stone – • It consists chiefly of grains of calcium carbonate (calcite) cemented together by a matrix of the same material with small proportions of magnesium carbonate, iron and clay. • Siliceous limestone are compact, weather well and have granular structure. Specific gravity from 2.0 to 2.7. Compressive strength varies from 40 to 90 N/mm2. • It is used extensively for manufacture of cement and lime. The quarry waste is used as road metal. Some times lime stone slabs used for paving, flooring and roofing.
D. Lime stone – • It consists chiefly of grains of calcium carbonate (calcite) cemented together by a matrix of the same material with small proportions of magnesium carbonate, iron and clay. • Siliceous limestone are compact, weather well and have granular structure. Specific gravity from 2.0 to 2.7. Compressive strength varies from 40 to 90 N/mm2. • It is used extensively for manufacture of cement and lime. The quarry waste is used as road metal. Some times lime stone slabs used for paving, flooring and roofing.

Explanations:

Lime stone – • It consists chiefly of grains of calcium carbonate (calcite) cemented together by a matrix of the same material with small proportions of magnesium carbonate, iron and clay. • Siliceous limestone are compact, weather well and have granular structure. Specific gravity from 2.0 to 2.7. Compressive strength varies from 40 to 90 N/mm2. • It is used extensively for manufacture of cement and lime. The quarry waste is used as road metal. Some times lime stone slabs used for paving, flooring and roofing.