Rapid Hardening Cement (RHC) are also called high early strength cement. The prime difference between the rapid hardening cement and ordinary Portland cement is the lime content. Large proportion of lime is the distinguishing feature of rapid hardening cement.
Manufacturing:
Rapid hardening cement is burnt at a higher temperature than that of the OPC under more controlled conditions.
Strength:
The 3 days strength of rapid hardening cement is equivalent to the 7 days strength of OPC when the water-cement ratio for both the cement is taken to be same.
The increased rate of strength is due to the fact that higher proportion of tri-calcium silicate (C3S) is contained in RHC along with finer grinding of the cement clinker. Though, the rate at which RHC gains strength is higher than the rate at which OPC gains strength, the ultimate strength is only a bit higher for RHC.
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