alleryStart learning →Flexure beam tests use four-point loading. For the larger 150 × 150 × 750 mm beam, what is the prescribed rate of central load increase?
A180 kg/min
B600 kg/min
C400 kg/min
D1000 kg/min
Answer & Solution
Correct answer: C. 400 kg/min
1. The standard prescribes an extreme fibre stress increase of about 7 kg/cm² per minute.
2. Converting to central load on the larger beam gives 400 kg per minute.
3. For the smaller 100 × 100 × 500 mm beam the equivalent rate is 180 kg per minute.
4. The load is applied without shock and continued until the beam fails.
5. The other rates are not specified.
_Source: IGNOU ET-522 Concrete Technology, Block 2 Unit 9 "Testing of Concrete"._
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