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No-fines concrete is made by omitting the sand fraction. The unit specifies the coarse aggregate must be single-sized, passing through and retained on which sieve pair?
Answer & Solution
Correct answer: D.
1. No-fines concrete relies on point-to-point contact of similar-sized coarse particles.
2. The unit prescribes single-sized coarse aggregate passing the 20 mm sieve.
3. The same particles must be retained on the 10 mm sieve to ensure uniformity.
4. Aggregate to cement ratio is held between 6:1 and 10:1.
5. The other size pairs would introduce a fine fraction the system is designed to omit.
_Source: IGNOU Concrete Technology, Unit 11 "Special Concrete" (Light Weight, Aerated, No-Fines, High Density, Fibre Reinforced, Polymer Concrete)._
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