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Difference Between 33, 43 and 53 Grade Cement 

Difference between cement type 33 43 and 53
Ordinary Portland cement has 3 degrees which are 33 degrees, 43 degrees, 53 degrees. According to the Bureau of Indian Standard, these types are distinguished by their compressive strength, and this strength is expressed in megapascals (Mpa), which is N / mm2.

Compressive strength is a load ratio per unit area. The load is calculated in Newton (N) and the area is calculated in mm2. The difference between grade 33, 43 and 53 cement is as follows:

IS codes
IS 269 is used for 33 degrees.

IS 8112 is used for 43 degrees.

IS 12269 is used for 53.

Compressive strength
To calculate compressive strength, cement, sand and water are mixed, vibrated and cured and cubes are made. These cubes are tested in the laboratory at 27 ° C after 3 days, 7 days and 28 days. The quality of the cement indicates the compressive strength of the cement concrete after 28 days of curing.

S.No. Degree of compressive strength of cement in 3 days (N / mm2) Compressive strength in 7 days (N / mm2) Compressive strength in 28 days (N / mm2)
1.33 degrees 16 23 27
2.43 degrees 22 33 37
3.53 degrees 33 43 53
Strength of cement of quality 33, 43 and 53 in 3, 7 and 28 days.

Initial strength
Here you can see that the initial strength of 53 degrees cement is greater than 33 degrees or 43 degrees cement. Grade 53 strength does not increase much after 28 days due to the early increase in strength.

While class 33 and class 43 cement gains strength after 28 days. Over time, grade 33 and 43 cement will achieve the same ultimate strength as grade 53 cement.

Warmth of hydration
During the initial curing, class 53 cement gives off much more heat of hydration than class 33 and 43 cement.

Therefore, the risk of microcracks is much greater and these microcracks may not be visible on the surface.

Often supervisors or masons on site increase the amount of cement in the mix. They think it will increase the strength and durability of concrete. But it creates micro cracks in the concrete.

Therefore, class 53 cement should only be used when such applications are justified to produce higher strength concrete, when good quality assurance and control measures exist, and when adequate precautions are taken to reduce the increased heat of hydration by means of a good curing process.

Cement of 43 quality gives off average heat of hydration.

33 cement is released under heat of hydration.