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State whether the following is true or false.
The 28-day strength of concrete is its maximum possible strength.

  • A.False only at small scales
  • B.True
  • C.False
  • D.True only at large scales

Answer: C

Strength continues to rise for months and sometimes years, particularly with blended cements. Twenty-eight days is a convenient point for specification rather than any limit of the material. Later strengths are sometimes specified where the loading allows.

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