Cement Industry Flashcards
What are the two main categories of cement?
Hydraulic (sets underwater, e.g., Portland cement) and non-hydraulic (requires air to set).
What is the primary raw material for cement production?
Limestone (provides calcium oxide, CaO).
What is the role of gypsum in cement manufacturing?
Acts as a setting time regulator (added during clinker grinding
Define “soundness” in cement.
Resistance to volume change after setting, preventing cracks.
Which cement type is ideal for sulfate-rich environments?
Sulfate-resisting cement (SRC).
What is the typical initial setting time for Ordinary Portland Cement (OPC)?
30 mins
Name two chemical compounds in cement that contribute to early strength.
C₃S (tricalcium silicate) and C₃A (tricalcium aluminate).
What is the purpose of the “kiln” in cement production?
To heat raw materials to ~1450°C to form clinker nodules.
Which test measures cement’s particle size?
Fineness test (e.g., sieve method).
Why is fly ash used in blended cement?
Improves sustainability and reduces clinker usage.
