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In a flexure beam test, if the fracture occurs outside the central portion CD and at a distance a from the nearer support, the test must be discarded if:
Answer & Solution
Correct answer: D.
1. The four-point loading produces pure bending only within the central span CD.
2. If fracture is inside CD the moment M = PL/3 (third-point loading).
3. If fracture is outside CD at distance a from the near support, moment M = Pa/2 is used.
4. The Pa/2 correction only holds for fractures close enough to CD.
5. The unit discards results whenever L/3 − a is greater than 0.05 L.
_Source: IGNOU ET-522 Concrete Technology, Block 2 Unit 9 "Testing of Concrete"._
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