Civil Engineering - Building Materials - Discussion

24. 

The lime which contains mainly calcium oxide and slacks with water, is

[A]. fat lime
[B]. quick lime
[C]. hydraulic lime
[D]. poor lime
[E]. none of these.

Answer: Option B

Explanation:

No answer description available for this question.

Santosh Kumar said: (Dec 18, 2015)  
Quick lime is obtain from calcination of pure lime.

caco3 -> cao + co2.

Here cao is called quick lime which slacks with water gives fat lime.

cao + H20 -> ca(oH)2 (slacking).

Here ca (oH) 2 is called fate lime or white lime.

Ashish Jamdhade said: (Aug 1, 2016)  
Fat lime contains 95% of calcium oxide. So fat lime is the answer.

Amit Ami Sharma said: (Aug 28, 2016)  
Quick lime is correct as it is capable of slacking with water and the major part is calcium oxide and minor magnesium oxide.

Johari said: (Feb 11, 2017)  
Yes, Quick lime is correct Major part is calcium oxide which is quick to react with H2O and cause slacking.

Devakumar said: (Sep 7, 2017)  
Behavior of slaking:.

Fat lime slakes rapidly when water is added giving out considerable heat and making hissing and cracking noise and increases 2 to 3 times its original volume. Fat lime if exposed to air, it absorbs moisture and CO2 from the atmosphere and becomes inert CaCO3 or chalk again and loses its cementing power. For developing the cementing power, quick lime must be slaked with water as early as possible, after it is obtained from the kiln.

Garry said: (Nov 23, 2017)  
What is the difference between fat and quick lime?

Jay said: (Jan 16, 2018)  
What is calcination?

Anomi said: (Jan 29, 2018)  
Calcination is process when cao react with water forms ca(oh2).

Joysen said: (Feb 22, 2018)  
Quicklime is correct.

Types of quicklime (CaO+impurities in the form of clay etc)-

1. Rich lime/fat lime/white lime- The quicklime in which 95% to 100% pure lime (CaO), 0-5% impurity.
2. Hydraulic lime- The quicklime in which 70 to 95% pure lime (CaO), 5-30% impurity.
3. Poor lime/Lean lime- the quicklime in which up to 70% (CaO), more than 30% impurity.

Joysen said: (Feb 22, 2018)  
@Jay, calcination is the process by which we can get quick lime(CaO) from its combined state (Ore) i.e. from CaCO3. If CaCO3 is burned( calcined) at a temperature of 900°c we will get.

CaCO3 ---> calcination@900°C-------> CaO + CO2.

Apurva said: (May 11, 2018)  
@All.

The hydraulic lime is made from Kankdar, i.e. it is made up of clay containing impurities up to 5% to 30%. Poor lime is made of clay containing impurities more than 50 to 30%.

Fat lime when mixed with water, it volume increase by 2 to 3 times. And it is used for putty & whitewashing work.

Quick lime is purely obtained by calcification and slack with water.

Sonia said: (Dec 4, 2020)  
Calcination is the heating of limestone to form quick lime.

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