Civil Engineering - Building Materials - Discussion

17. 

The cement becomes unsound by the presence of excess

[A]. sulphur
[B]. magnesia
[C]. lime
[D]. All of these.

Answer: Option D

Explanation:

No answer description available for this question.

Dev said: (Dec 26, 2016)  
It is Free lime.

Ganesh said: (Apr 4, 2017)  
Please give me exact answer with the explanation.

Jiren said: (Jul 19, 2017)  
The lime in excess makes the cement unsound and causes the cement to expand and disintegrate.

This ingredient, if present in small amount, imparts hardness and colour to the cement. A high content of magnesia makes the cement unsound.

A very small amount of sulphur is useful in making sound cement. If it is in excess, it causes the cement to become unsound.

Deepakrawat said: (Aug 5, 2017)  
Soundness due to the lime is measured in Le-Chaltier's apparatus.
Soundness due to magnesia is measured in auto clave test.
Soundness due to sulphur can't be measure.

Vipul said: (May 7, 2019)  
D is correct. I agree with the given answer.

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