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What is the purpose of adding gypsum in cement?

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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Kanwarjot Singh

Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.

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10 comments on "What is the purpose of adding gypsum in cement?"

Haresh Kalariya says:

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 says:

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

sanjay kumar says:

more the stress more the modulus of elasticity

Shai Lyngdoh says:

gypsum used in cement manufacturing acts as what.???

Dinesh Kumar says:

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

Sajid says:

How gypsum work as a retarder in cement?

zia ur rehman says:

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

Victor martin says:

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

lee says:

What minimum purity for gypsum used in cement

Kelvin Mulwa says:

retarder, preventing flash setting of cement

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