GK
GENERAL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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increase the tensile strength of cement
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decrease the rate of setting of cemen
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facilitate the formation of colloidal gel
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bind the particles of calcium silicate
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Detailed explanation-1: -Gypsum is added to control the “setting of cement”. If not added, the cement will set immediately after mixing of water leaving no time for concrete placing. Hence, Gypsum is added to the cement clinker to decrease the rate of setting of cement.
Detailed explanation-2: -When Gypsum is added to the Cement it binds with Tricalcium aluminates to make a colloidal gel and the above reaction don’t take place. So it slows the process of fastening. Dicalcium silicate has the property of slow setting but becomes strong after a month of Hydration.
Detailed explanation-3: -During cement manufacturing process upon cooling of clinker a small amount of gypsum is added during the final grinding process. Gypsum controls the setting of the cement and if not added the cement will set immediately leaving no time for concrete placing.