Grades of cement & their applications | What is 33,43 & 53? | Civil Tutor

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clpsheldon.pag... In this lecture, I have discussed briefly the grades of cement and their various applications in the field of civil engineering.
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Cement is a binding material that sets, hardens, and sticks to other materials to bind them together. This material is widely used in the construction field to bind sand and aggregate together. When mixed with fine aggregates or sand, it produces mortar for masonry and when it’s mixed with coarse aggregates it produces concrete which is believed to be the most consumed resource on earth after water.
The base of every construction depends upon the composition of various ingredients that are used in making the construction possible. One of the most important ingredient is the cement and the strength of which is directly proportional to the strength of concrete or mortar. Hence before choosing the cement the cement for constructing your dream projects, you should be aware about the grades of cement.
Depending upon the compressive strength, cement is classified into 3 grades;
1) 33 Grade cement
2) 43 Grade cement
3) 53 Grade cement
Now the question arises,
What is 33,43 & 53?
These numbers indicate the compressive strength of cement cube in N/mm2 after 28 days of curing, where each side of cement mould is taken as 70.6mm. The grade of cement is determined on the basis of compressive strength achieved after 28 days.
For calculating the compressive strength, cement mortar is prepared in the mix ratio of 1:3 in which 1 part of cement is mixed with 3 parts of fine aggregates/sand with an adequate quantity of water. After preparing the mortar, cubes having each side 70.6mm are made from this mortar. These cubes are then vibrated properly for around 2 minutes to reduce the number of voids present in the paste. Before placing these casted cubes in the compression testing machine, we need to make sure, there should not be any cracks or shrinkages developed in these cubes. Generally, we need to prepare 3 cubes. The cube tests are performed after 3 days, 7 days, and 28 days. i.e., Cube 1 is tested after 3 days, Cube 2 after 7 days, and the 3rd cube is tested after a period of 28 days.
The 33-grade cube should give a compressive strength of 16N/mm2 after 3 days , 22N/mm2 after 7 days, and 33N/mm2 after 28 days.
To make it easy for you, I have prepared a table in which I have shown the different grades of cement with corresponding compressive strengths in 3,7 and 28 days.
Heat of Hydration
The 53 grade of cement releases heat of hydration at a much faster rate in comparison to 33 and 43 grades of cement, therefore increasing the chances of cracks in concrete. The heat of hydration is released as soon as cement is mixed with water hence 53 grade should be used only in good supervision and where proper precautions are taken to reduce the higher heat of hydration through proper curing.
Applications of cement grades:
Applications of 33-Grade
33-Grade is a rarely used grade nowadays. This grade is suitable for preparing low strength concrete grades (below M20 Grade)
33-Grade of cement is used in low strength concrete structures such as Parapet walls & Compound walls.
Applications of 43-Grade
43-Grade of cement is Suitable for PCC (Plain Cement Concrete) works and Plastering and is commonly used for RCC works up to M30 grade. This grade is used in plastering works, Tiling works, Flooring, Pathways, Finishing works of bridges & water retaining structures.
Applications of 53-Grade
This grade is suitable for RCC works above M30 grade.
53-Grade is used for casting high-strength concrete structural members like Beams, Columns, Slabs & Footings. This grade is suitable for constructing high-rise buildings, Industrial buildings, precast concrete works, prestressed structures like bridges, slabs, concrete pavements, runways, etc.

[@fanindia7513]

But after certain time even 33 and 43 grade cement also reaches the same strength as that of 53grade. Concrete strength depends on mixing ratio but the setting time depends on grades of cement. 43 and 33 grade cement also achieves slowly the designed concrete mix strength, but only thing is 53grades achieves faster.

[@CivilTutor]

Great point!

[@HarshaVardhan-zg5qc]

I humbly thank you sir🙏

[@aiswariyarajan-a4120]

Thanks for u r useful videos sir..... Plz upload videos more sir about construction materials 🙏

[@CivilTutor]

Sure 👍

[@phirumthong1050]

Thanks

[@koteswararaoav5029]

Thank you sir

[@CivilTutor]

Welcome

[@shashankpeddauppari2337]

With time 33 and 43-grade cement will attain the same ultimate strength as that of 53-grade cement Is it true

[@jayjay141]

Can we use PPC for RCC work?? In M20 concrete

[@ariftheblogger01]

Super keep supporting