During manufacture of cement , if there is free lime left in the cement due to under burning of clinkers , and amount of this uncombined lime (CaO) in the finished cement is considerable , expansion and disruption of concrete may evenrtually occur .
Different types of cements can be developed by changing the relative proportions of the four Bogue compounds and also fineness of the cement . This variation can be achieveced by suitably changing the composition of raw materials .
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