Rapid hardening Portland Cement (RHPC)

In rapid hardening, Portland cement strength develops rapidly i.e high early strength. It develops strength in 3 days as developed by OPC of 53 grade at 7 days. Rapid hardening or strength development is due to -

   the higher fineness of grinding resulting in greater surface area available for hydration.

  Higher C₃S (70% by the weight of dry cement)     and C₂S content.