Hello friends in this we discuss types of cement, 

Here after reading this post you will understand what is rapid hardening cement and extra rapid hardening cement also you will be able to distinguish between the two types of cement,

Let's start reading and enjoying

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Rapid hardening cement (IS: 8041)

• has more C3S less C2S.

• This cement must not be-used for mass concrete because due to large quantity of 

heat of hydration, the temperature inside the concrete increases, leading to formation 

of undesirable crack on cooling.

• 1 day which an ordinary cement attains in 3 days with the same water cement ratio.

• Subjected to large shrinkage water requirement for workability is more.

• Cost of 10 per cent-more than the ordinary cement.

• It contains more C3S and less C2S less C2S than the OPC.

• Repair of roads, bridges and in structures.

Extra Rapid Hardening Portland cement (ERHC) or Ultra Rapid hardening Portland 

cement.

• 2% Cacl2 and rapid hardening Portland cement.

• Maximum time of 10 minutes is available for mixing, transporting and placing the 

concrete.

• Additions of CaCl2 ensure quick setting and hardening properties repair works.

• Not used in prestressed concrete.

• Higher percentage of CaCl2 causes excessive shrinkage.

• 1 day in is 25% more and 7 days is = 20% more than OPC.

• Calcium chloride cement.