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Q: According to IS 8041-1990, the minimum specific surface area (by Blaine's air permeability method) required for rapid hardening Portland cement is:
  • A. 3250 cm²/g
  • B. 3500 cm²/g
  • C. 3200 cm²/g
  • D. 2250 cm²/g
Correct Answer: Option A - According to IS 8041-1990, the minimum specific surface area (by Blain's air permeability method) required for rapid hardening portland cement is 3250 cm²/g. • For ordinary Portland cement = 2250 cm²/g • For low heat cement = 3250 cm²/g • For Portland pozzolana cement = 3000 cm²/g • For super sulphate cement = 4000 cm²/g • For high alumina cement = 2250 cm²/g
A. According to IS 8041-1990, the minimum specific surface area (by Blain's air permeability method) required for rapid hardening portland cement is 3250 cm²/g. • For ordinary Portland cement = 2250 cm²/g • For low heat cement = 3250 cm²/g • For Portland pozzolana cement = 3000 cm²/g • For super sulphate cement = 4000 cm²/g • For high alumina cement = 2250 cm²/g

Explanations:

According to IS 8041-1990, the minimum specific surface area (by Blain's air permeability method) required for rapid hardening portland cement is 3250 cm²/g. • For ordinary Portland cement = 2250 cm²/g • For low heat cement = 3250 cm²/g • For Portland pozzolana cement = 3000 cm²/g • For super sulphate cement = 4000 cm²/g • For high alumina cement = 2250 cm²/g