The slurry, in its movement down the kiln, encounters a progressively higher temperature. At first, the water is driven off and __________ is liberated.(a) SiO2(b) CO2(c) Gypsum(d) CaOThe question was posed to me by my school principal while I was bunking the class.My question is from Process of Manufacture of Fresh Concrete topic in division Fresh Concrete of Concrete Technology

The slurry, in its movement down the kiln, encounters a progressively

1.	The slurry, in its movement down the kiln, encounters a progressively higher temperature. At first, the water is driven off and __________ is liberated.(a) SiO2(b) CO2(c) Gypsum(d) CaOThe question was posed to me by my school principal while I was bunking the class.My question is from Process of Manufacture of Fresh Concrete topic in division Fresh Concrete of Concrete Technology
Answer» Right ANSWER is (B) CO2 To elaborate: At 900°C LIMESTONE decomposes, CaCO3.CaO + CO2 (ENDOTHERMIC reaction) CO2 is swept AWAY by current air.

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