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In a flexure (modulus of rupture) test, the standard beam size is 150 × 150 × 750 mm when the nominal maximum aggregate size exceeds or equals 20 mm. Which beam size is used when the nominal maximum aggregate is below 20 mm?
Answer & Solution
Correct answer: B.
1. The unit gives two beam sizes for flexure testing.
2. For nominal aggregate ≥ 20 mm, beams are 150 × 150 × 750 mm.
3. For nominal aggregate < 20 mm, beams are 100 × 100 × 500 mm.
4. The choice scales the cross-section with the aggregate so the wall effect is bounded.
5. The other sizes are not specified by the unit.
_Source: IGNOU ET-522 Concrete Technology, Block 2 Unit 9 "Testing of Concrete"._
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