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Carbon fibre reinforced cement composite (with about 8 percent fibre by volume and aligned fibres) is reported by the unit to reach a modulus of rupture of approximately:
Answer & Solution
Correct answer: D.
1. Carbon fibres possess high tensile strength and high Young's modulus.
2. The unit reports an aligned carbon fibre composite with 8 percent fibre by volume.
3. The reported modulus of rupture is as high as 1623 kg/cm² with high fatigue resistance.
4. Carbon fibre is therefore a promising material for structural applications.
5. The 120, 400 and 5000 kg/cm² values do not match the reported figure.
_Source: IGNOU Concrete Technology, Unit 11 "Special Concrete" (Light Weight, Aerated, No-Fines, High Density, Fibre Reinforced, Polymer Concrete)._
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