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The 'aspect ratio' that the unit uses for sizing a fibre is defined as:
Answer & Solution
Correct answer: A.
1. Each fibre is characterised by its slenderness through a single dimensionless number.
2. The unit defines aspect ratio as fibre length divided by equivalent diameter.
3. Typical aspect ratios for practical fibres range from 30 to 150.
4. Beyond an aspect ratio of about 100 with high volume fraction, mixing becomes difficult due to balling.
5. Modulus, volume and strength ratios are different properties, not aspect ratio.
_Source: IGNOU Concrete Technology, Unit 11 "Special Concrete" (Light Weight, Aerated, No-Fines, High Density, Fibre Reinforced, Polymer Concrete)._
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