Discussion
Identify whether the following statements related to concrete are true/false.
1. In principle, as the compaction factor increases, the slump decreases.
2. Slump and slump flow of concrete are both measured in mm or cm.
Answer: A
Statement 1 is false and statement 2 is true. A higher compaction factor means that the concrete is more workable (it compacts more under its own weight), and a more workable mix has a larger slump, so the slump increases with the compaction factor and does not decrease. Statement 2 is correct: both the slump and the slump flow are lengths, read off in millimetres or centimetres. The other options, which call the first statement true, are rejected.
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