Civil Engineering - Building Materials - Discussion

39. 

Pick up the correct statement from the following:

[A]. The heating of a material to redness in contact with air, is known as calcination
[B]. The property of lime by which it sets or hardens in damp places having no free circulation of air is called setting
[C]. The product that remains after calcination of limestone, is called lime
[D]. All the above.

Answer: Option D

Explanation:

No answer description available for this question.

Ashley said: (Nov 1, 2016)  
Calcination in absence of air!

So, the answer is wrong here!

Apcivilian said: (Dec 25, 2017)  
Calcination is in absence of air how the 1st option is right Here?

Anshul Thakur said: (Aug 24, 2018)  
The IUPAC defines calcination as " heating to high temperatures in air or oxygen".

However, calcination is also used to mean a thermal treatment process in the absence or limited supply of air or oxygen applied to ores and other solid materials to bring about a thermal decomposition. A calciner is a steel cylinder that rotates inside a heated furnace and performs indirect high-temperature processing (550"1150 °C, or 1000"2100 °F) within a controlled atmosphere.

Viki said: (Oct 8, 2019)  
@Apcivilian Calcination can involve limited supply of air.

Faraaz said: (Oct 13, 2020)  
Property of lime by which it sets or hardens in damp places having no free circulation of air is called hydraulicity of lime.

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