Discussion
Consider the following statements about strength testing.
1. Standard sand is used to remove aggregate variability.
2. Results are reported at several ages including 28 days.
3. The mortar cube result equals the strength of concrete made with that cement.
Answer: C
The first two are correct. The third overstates what the test does, since a mortar of fixed proportions cannot predict the strength of a concrete whose mix design has not yet been chosen. The class is an input to mix design rather than its output.
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