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What is the difference between 43 and 53 grade cement?

G.Vijayashekar, Chennai

ANSWER: The grade 43 and 53 in cement mainly corresponds to the average compressive strength attained after 28 days ( 6724 hours) in mega pascals (Mpa) of at least three mortar cubes ( area of face 50 cm squared) composed of one part cement, 3 parts of standard s and

( conforming to IS 650:1966) by mass and P/4 ( P is the percentage of water required to produce a paste of standard consistency as per IS standard) + 3 percentage ( of combined mass of cement plus sand) of water , prepared, stored and tested in the manner described in methods of physical test for hydraulic cement.

721 hr not less than 23 MPa for 43 grade, 27 MPa for 53 grade

1682 hrs not less than 33MPa for 43 grade, 37MPa for 53 grade

6724 hrs not less than 43MPa for 43 grade, 53 MPa for 53 grade

Biju Ravindran, Chennai

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