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In the Rapid Analysis Machine (RAM) used to determine cement content of fresh concrete, on which physical principle does the separation work?
Answer & Solution
Correct answer: C.
1. RAM separates cement particles from aggregate in a wet stream.
2. The principle is elutriation, where an upward fluid current carries off the fine cement as slurry.
3. The coarse and fine aggregate stay behind, the cement slurry is flocculated and weighed.
4. The complete cycle takes about 10 minutes versus ~2 hours for the IS 1199 wet-sieving method.
5. Centrifugal, sieve and magnetic routes are not the principle used in RAM.
_Source: IGNOU ET-522 Concrete Technology, Block 2 Unit 9 "Testing of Concrete"._
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