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Asbestos fibre has been used to reinforce Portland cement, giving considerably high flexural strength. The unit notes that the maximum length of asbestos fibre is generally:
Answer & Solution
Correct answer: C.
1. Asbestos was historically the most successful mineral fibre for cement composites.
2. It produced very high flexural strength in thin cementitious sheets.
3. The unit reports the maximum length of asbestos fibre as 10 mm, with most fibres shorter.
4. The short fibre length combined with high aspect ratio gives the matrix its tensile capacity.
5. 50 mm and 100 mm exceed the asbestos fibre length stated.
_Source: IGNOU Concrete Technology, Unit 11 "Special Concrete" (Light Weight, Aerated, No-Fines, High Density, Fibre Reinforced, Polymer Concrete)._
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