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Per the unit's mix proportions for fibre reinforced concrete, the recommended steel fibre volume in the mix lies in the range:
Answer & Solution
Correct answer: A.
1. Steel fibres are added in moderate volume so the mix can still be placed and compacted.
2. The unit's recommended mix proportions specify 0.5 to 2.5 percent fibre volume.
3. Cement content is held at 325–500 kg/m³ and water/cement at 0.4 to 0.6.
4. Maximum aggregate size is limited to 10 mm so the fibres distribute uniformly.
5. Volumes above about 2 percent with aspect ratio above 100 cause balling and unmixable concrete.
_Source: IGNOU Concrete Technology, Unit 11 "Special Concrete" (Light Weight, Aerated, No-Fines, High Density, Fibre Reinforced, Polymer Concrete)._
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