Role of Gypsum in Cement making | Cement chemistry by Dr K Mohan

Lecture-16: Role of Gypsum in Cement making | Cement chemistry by Dr K Mohan.
Dr K Mohan is an internationally renowned and an acclaimed cement scientist. He is a former Director General of National Council for Cement and Building Materials (NCCBM).
He holds a Ph.D. degree in Cement Chemistry from University of Aberdeen, Scotland, U.K.
• The main purpose of adding gypsum in the cement making is to slow down the hydration process of cement once it is mixed with water.
• The process involved in hydration of cement is that, when the water is added into cement, it starts reacting with the C3A and hardens. The time taken in this process is very less, which doesn’t allow time for transporting, mixing and placing.
• When gypsum is added into the cement and water is added to it, reaction with C3A particles tales place to form ettringite.
• This ettringite is initially formed as very fine-grained crystals, which form a coating on the surface of the C3A particles.
• These crystals are too small to bridge the gaps between the particles of cement. The cement mix, therefore, remains plastic and workable.
• The time allowed for mixing, transporting and placing plays an important role in strength, composition, and workability of concrete.
• As gypsum retards the process of hydration, it is termed as a retarding agent of cement.
#Gypsum #Cementchemistry #Clinkerchemistry #RoleofGypsum

[@theengineerspoint]

Thank you sir for doing everything for Enhancing our technical knowledge..🙏

[@kardambhatt2645]

Very useful information sir

[@RaviSharma-ik1ps]

Nice sir ji .. 🙏👍

[@rajukafle5757]

Good job.

[@ranjeetkumarpareek3611]

Sir aap ek din bde start bnoge

[@shubhamjosh2014]

Role of gypsum only work on nitial setting time or then it's also work on final setting time ?~??

[@harishdahariya5123]

👍

[@arunm9696]

sir there any vacancy for qc or chemist in cement plant

[@Quizby]

if gypsum purity is 70% and so3 1.5% what will be the gypsim conduction ?

[@madhankumarj7601]

pls explain in English

[@deepakbarh5726]

Hindi explain

[@rabbanishaik361]

Explanation hindi hogato acha

[@Quizby]

if gypsum purity is 70% and so3 1.5% what will be the gypsim conduction