The cement of good quality does not contain the impurities like free lime, magnesia, and sulfates, 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 unwanted results like, cracking, unwanted expansion of the dimensions, and lower strength. Prepare a cement paste of 78% of standard consistency of the cement, and fill it into the split brass cylinder. Cover the top and bottom of the cylinder and put it in the water at 27 degrees Celsius for 24 hours. After 24 hours, measure the separation between the two indicators at their pointed ends. Then heat the whole water and immersed cylinder with paste up to a boiling temperature in 30-35 minutes and then boiling for 3 hours. After cooling it down, again measure the separation between the two pointers.