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Q: According to IS Code provisions, minimum compressive strength of heavy-duty bricks required for masonry in heavy engineering works such as bridge structures and industrial foundations is
  • A. 40 N/mm²
  • B. 20 N/mm²
  • C. 10 N/mm²
  • D. 5 N/mm²
Correct Answer: Option C - Heavy duty burnt clay brick (IS 2180)– The compressive strength of heavy duty brick should not be less than 40 N/mm². • Water absorption should not be more than 10% after 24 hours immersion in water for heavy burnt clay bricks. Classification– Class 400 → Compressive strength 40-45.0 N/mm² Class 450 → Compressive strength 45.0 N/mm² Efflorescence → Should be nil. Bulk density → Should be less than 2500 kg/m³.
C. Heavy duty burnt clay brick (IS 2180)– The compressive strength of heavy duty brick should not be less than 40 N/mm². • Water absorption should not be more than 10% after 24 hours immersion in water for heavy burnt clay bricks. Classification– Class 400 → Compressive strength 40-45.0 N/mm² Class 450 → Compressive strength 45.0 N/mm² Efflorescence → Should be nil. Bulk density → Should be less than 2500 kg/m³.

Explanations:

Heavy duty burnt clay brick (IS 2180)– The compressive strength of heavy duty brick should not be less than 40 N/mm². • Water absorption should not be more than 10% after 24 hours immersion in water for heavy burnt clay bricks. Classification– Class 400 → Compressive strength 40-45.0 N/mm² Class 450 → Compressive strength 45.0 N/mm² Efflorescence → Should be nil. Bulk density → Should be less than 2500 kg/m³.