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A 53 grade cement is tested and gives 51 megapascals at 28 days. What follows?

  • A.the result cannot be interpreted at all
  • B.it fails, the grade being a minimum that must be met
  • C.it passes, since the figure is close enough
  • D.it passes, since grade refers to 7-day strength

Answer: B

The grade states a minimum, so anything below it fails regardless of how close it comes. Producers therefore aim well above the nominal figure to allow for normal variation between batches. The margin is calculated from the observed scatter of results.

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