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Q: Which type of cement is produced by grinding clinkers formed by calcining bauxite, lime, iron oxide with a little ferric oxide, silica magnesia, etc? (Note that alumina content in this type of cement should NOT be less than 32%)
  • A. Acid resistance cement
  • B. Blast furnace cement
  • C. Colored cement
  • D. High alumina cement
Correct Answer: Option D - High Alumina Cement (IS : 6452-1989)– • Bauxite (40%), Limestone (40%), Iron oxide (15%) • Initial setting time- min. 3 hour 30 minute. • Final setting time- max. 5 hour. • It is used for refractory concrete, industries and used widely in pre-casting and very resistance to chemical attack. • Particularly suitable to sea and under water work. • Expansion ≤ 5 mm.
D. High Alumina Cement (IS : 6452-1989)– • Bauxite (40%), Limestone (40%), Iron oxide (15%) • Initial setting time- min. 3 hour 30 minute. • Final setting time- max. 5 hour. • It is used for refractory concrete, industries and used widely in pre-casting and very resistance to chemical attack. • Particularly suitable to sea and under water work. • Expansion ≤ 5 mm.

Explanations:

High Alumina Cement (IS : 6452-1989)– • Bauxite (40%), Limestone (40%), Iron oxide (15%) • Initial setting time- min. 3 hour 30 minute. • Final setting time- max. 5 hour. • It is used for refractory concrete, industries and used widely in pre-casting and very resistance to chemical attack. • Particularly suitable to sea and under water work. • Expansion ≤ 5 mm.