What is the purpose of adding gypsum in cement?

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Gypsum is a mineral and is hydrated calcium sulfate in chemical form. Gypsum plays a very important role in controlling the rate of hardening of the cement. During the cement manufacturing process, upon the cooling of clinker, a small amount of gypsum is introduced during the final grinding process.

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.


This question is taken from book named – A Closer Look at Prevailing Civil Engineering Practice – What, Why and How by Vincent T. H. CHU.

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  • Haresh Kalariya October 15, 2012 at 1:18 pm

    what is the role of gypsum. if we are add2.50% gypsum for grinding cement and same clinker we add 4.0% gypsum for grinding cement. what is the effect in compressive strength.

    • Murugan November 26, 2015 at 10:55 pm

      We are adding the gypsum not only for control the setting of cement. It is contribute for cement early strength by SO3.

  • sanjay kumar October 16, 2012 at 2:47 am

    more the stress more the modulus of elasticity

  • Dinesh Kumar April 20, 2015 at 2:39 pm

    manufacturing of cement,type of cement, percentage gypsum in cement

  • Sajid November 4, 2015 at 9:46 am

    How gypsum work as a retarder in cement?

  • zia ur rehman October 3, 2016 at 9:43 am

    adding of gypsum to concrete decrease the compressive strength of concrete or not????

  • Victor martin February 4, 2017 at 5:01 am

    Gypsum also influences the grindability of the cement, that is the grinding energy required to produce cement.

  • lee November 30, 2018 at 6:59 pm

    What minimum purity for gypsum used in cement

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