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Indian Institute of Technology (IIT) Roorkee 
A synthesis process for the development of calcium silicate hydrate (C-S-H) based concrete hardening accelerator 
Sonalisa Ray, Saikat Das and Sudipta Sarkar 
Indian Institute of Technology (IIT) Roorkee 
Application type:
Applied - 2020-04-22 
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Indian Institute of Technology (IIT) Roorkee 
The present invention relates to a simple synthesis method of C-S-H. A cation exchange resin column forms the heart of the process. When contacted with any electrolyte solution, the cation exchange resin shall exchange only the cations, without altering the composition of the anions present in the electrolyte solution. In the first step, the cation exchange resin in sodium form kept in a column is contacted with a dilute electrolyte solution containing calcium ions along with other anions like chloride, nitrate, sulfate or hydroxyl, when sodium ions are exchanged for equivalent concentrations of calcium ions. 

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