suji

 Profile Answers by suji Questions by suji

• Mar 7th, 2012

 

Soundness of cement is the property of hardened cement paste undergoing large change in volume after setting without delayed destructive expansion. This destructive expansion is caused by excessive amounts of free lime or magnesia. This change in volume may cause crack and disintegration of concrete.
Soundness of cement can be checked by using Le-Chatlier’s apparatus.

shahanth

 Profile Answers by shahanth Questions by shahanth

• Mar 11th, 2013

 

adding to suji answer Le-Chatliers detects unsoundness due to free lime only. as per I.S specification cement having more than 3% magnesia shall be tested for soundness by "Autoclave" which is sensitive to both free magnesia and LIME.

B.Mohamed Mansoor

• Nov 3rd, 2013

 

SOUNDNESS OF CONCRETE 10%

Caleb Wanga

• Nov 22nd, 2015

 

The expansion may occur due to reaction of free lime, magnesia and calcium sulphate.

Free lime is present in the clinker and is intercrystallized with other compounds.
Magnesia reacts with water in a manner similar to CaO, but only the crystalline forms is the deleteriously reactive so that unsoundness occurs

Biplab Kumar kisan

• Dec 5th, 2015

 

Soundness of cement is the property by virtue of which the cement does not undergo any appreciable expansion (or change in volume) after it has set, thus eliminating any chances of disrupting the mortar or concrete.

B. NARENDRA

• Oct 22nd, 2018

 

Specific gravity of cement to conduct the material was sink or float

sathwika

• Jan 29th, 2019

 

It is essential that the cement concrete does not undergo large changing in volume after setting this is ensured by limiting the quantity of free lime, magnesia in whole cement.