Cement of good quality does not contain the impurities like free lime, magnesia and sulphates, so this should be checked before use.
When it contains the impurities named above, it can expand after reacted with the water, which will result in the unwanted results like, cracking, unwanted expansion of the dimensions and lower strength.
Le-Ch-atelier's Apparatus is the standard apparatus prescribed as per IS:5514 -1969 to check the presence of the impurities in cement. Cement is said to be sound when the expansion is below 10 mm.
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