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Rapid Hardening Cement

Rapid Hardening Cement
July 12
16:36 2014
Rapid Hardening Cement Rapid Hardening Cement Rapid Hardening Cement Rapid Hardening Cement

Rapid Hardening Cement

Rapid Hardening Cement is also called Early Strength Cement because its 3 days strength is almost equal to 7 days strength of OPC. It is different from quick setting cement which only sets quickly whereas in RHC, strength development is very fast.

The initial and final setting times of rapid hardening cement are the same as those of ordinary ppc cement. But it attains high strength in early days. It contains high percentage of tricalcium silicate C3S to the extent of about 56%. This is due to the following facts:

(i) Burning at high temperatures.
(ii) Increased lime content in cement composition.
(iii) Very fine grinding.

This cement is slightly costlier than ordinary cement.

Advantages of Rapid Hardening Cement:

(i) As it sets rapidly, the work may be carried out speedily.

(ii) The formwork of concrete can be removed earlier and it can therefore be used frequently.

(iii) It obtains strength in a short period. The compressive strength at the end of one day is about 11.50 N/mm2 and that at the end of 3 days is about 21 N/mm2. Similarly the tensile strength at the end of one day is about 2 N/mm2 and that at the end of 3 days is about 3 N/mm2.

(iv) It is light in weight.

(v) It is not damaged easily.

(vi) The structural members constructed with this cement may be loaded earlier.

(vii) This cement requires short period of curing.

(viii) The use of this cement allows higher permissible stresses in the design. It therefore results in economic design.

Disadvantages of Rapid Hardening Cement:

This cement is slightly costlier than ordinary cement.

Get more informaton on Types of Cement

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