Rapid Hardening Cement is similar to Ordinary Portland Cement (OPC) but with higher tri-calcium silicate (C3S) content and it is ground more finely . It gain strength more quickly than OPC, though the final strength is only slightly higher.
As the name indicates it develops strength rapidly and it is also known as High Early Strength Cement.
One day strength of this cement is equal to 3 day strength of OPC and Three days strength of rapid hardening cement is equals to seven days strength of OPC cement.
Physical Characteristic of Rapid Hardening Cement:
Chemical Characteristic of Rapid Hardening Cement:
Advantages of Rapid Hardening Cement:
- Rapid hardening cement is used in the situation where rapid development of strength is desired. For example: Form-work need to be removed early for reuse.
- It requires a short period of curing. The shrinkage levels are lower during the hardening or curing process. Rapid strength gain is accompanied by higher rate of heat development useful in cold environment concreting.
- It is resistant to sulfate attack and also offers resistance to any sort of chemical attack.
- It is used when sufficient strength for further construction is wanted.
- It is used for Emergency or road repair work.
- It can be used to increase the speed of construction.
- It can be used in pre-fabricated concrete construction.
- Generally used for constructing road pavements.
Disadvantages of Rapid Hardening Cement:
- It is slightly costly than other options available in the market
- It cannot be used for mass constructions.