Cements have grades ie 33, 43, 53? Where did the numbers 33, 43, 53 originate?

These numbers refer to the compressive strength gained by the cement-sand mortar mixed in the proportion of

1:3 with

(p/4 + 3)% of water of the total mass.

The mortar so obtained is caste into cubical moulds of 70.5mm side ie 5000mm2 area and cured for a period of 28 days and then tested in a compression testing m/c.

The grade of any cement sample is an assurance of the fact that the compressive strength as determined with the help of the above mentioned test will be atleast equal to it.

Cements have grades ie 33, 43, 53? Where did the numbers 33, 43, 53 originate?windows server 2003

They reference their respective ASTM Standard. For example, 33 concrete means it conforms to ASTM Standard C-33.

Cements have grades ie 33, 43, 53? Where did the numbers 33, 43, 53 originate?windows xp service internet explorer

the grade of a cement ie 1,2,3,4,5 or 13,23,33 etc are based on their uses 1 is general use 2 is a moderate or low heat of hydration cement, 3 sulphate resistance cement, 4 water resistant cement and 5 is high sulfate resistance and heat of hydration
1 33 Grade Ordinary Portland Cement(IS: 269 -1989) The compressive strength after 28 days is 33 N/mm2

Used for general construction works in normal environmental conditions.

Cannot be used where higher grade of concrete above M-20 is required.

The use of this cement has progressively decreased and virtually phased out.

2 43 Grade Ordinary Portland Cement (IS: 8112 - 1989) Most widely used cement for general construction work.

Minimum 28 days Compressive Strength -43 N/mm2.

Used for construction of residential, commercial and industrial buildings, roads, bridges, flyovers, irrigation projects and other general civil construction works.

Suitable for all types of applications - RCC, Plastering, Masonry5. Rajashree is the premium OPC 43 brand in the market giving strength of around 65 MPa at 28 days.

3 53 Grade Ordinary Portland CementIS: 12269 - 1987 Introduced in 1991 by Grasim - Birla Super.

Minimum 28 days Compressive strength - 53 N/mm2

Gives 10-15% saving in cement consumption %26amp; 5-8% saving in steel consumption provided higher grades of concrete say M30 and above are used.

Useful for high rise buildings bridges, flyovers, chimneys and pre-stressed structures where high grade concrete is required.

Gives better durability characteristics to concrete -high grade concrete can be made with lower water cement ratio
The grading actually is the 28 days strength when tested under standard conditions. The compressive strength achieved by 33 grade at the end of 28 days is 330 kg/cm2 while 43 grade achieves 430 kg/cm2 and so on.