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Q: The addition of Fly-Ash as an additive in the brick mix proportions results in:
  • A. reduced fineness
  • B. reduced drying shrinkage
  • C. less fire resistance
  • D. loss of compressive strength
Correct Answer: Option B - • The fly ash contains amorphous glassy materials mullet, hematite magnetite, etc and shows a chemical composition similar to brick earths. • The proportion of fly ash mixed as an additive to the brick earth should be optimum to reduce drying shrinkage, check drying losses and to develop strength on firing without bloating or black coring in fired product.
B. • The fly ash contains amorphous glassy materials mullet, hematite magnetite, etc and shows a chemical composition similar to brick earths. • The proportion of fly ash mixed as an additive to the brick earth should be optimum to reduce drying shrinkage, check drying losses and to develop strength on firing without bloating or black coring in fired product.

Explanations:

• The fly ash contains amorphous glassy materials mullet, hematite magnetite, etc and shows a chemical composition similar to brick earths. • The proportion of fly ash mixed as an additive to the brick earth should be optimum to reduce drying shrinkage, check drying losses and to develop strength on firing without bloating or black coring in fired product.