Discussion
A cement strength class such as 43 or 53 in Indian practice refers to
Answer: A
Correct answer: the minimum 28-day compressive strength in megapascals
A 43 grade cement must reach at least 43 MPa on standard mortar cubes at 28 days, and a 53 grade at least 53. The figure is a floor rather than a typical value, and it is a mortar strength under standard conditions - not the strength of any concrete made with it, which depends on the mix as much as on the cement.
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