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What reactions take place in the setting of cement form into 7 days

What reactions take place in the setting of cement form into 7 days

Grade:12

1 Answers

Vikas TU
14149 Points
4 years ago
Dear student 
When cement is mixed with water, it becomes hard over a period of time. This is called setting of cement. Gypsum is often added to Portland cement to prevent early hardening or “flash setting”, allowing a longer working time. Gypsum slows down the setting of cement so that cement is adequately hardened.
When cement reacts with water, the silicates and aluminates of calcium gets converted to the hydrated colloidal gels and following reactions take place
 
2CaO.SiO2 + x H2O→2CaO.SiO2 .xH2O   (This is hydrated colloidal gel of Tricalcium silicate)

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