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The trade name 'Wirand' refers to a commercial fibre reinforced concrete whose properties the unit compares with conventional concrete. The rights to Wirand are held by:
Answer & Solution
Correct answer: A.
1. The unit's Table 11.4 compares Wirand concrete with conventional concrete on six properties.
2. Wirand shows ultimate flexural strength of 6–17.5 N/mm² versus 2.1–5.5 N/mm² for plain concrete.
3. Its impact resistance is reported as 445 N against 156 N for the plain mix.
4. The unit states the rights to Wirand are vested in Battelle Development Corporation.
5. Bureau of Reclamation worked on PIC, and Building Research Establishment developed glass-fibre Cem-Fil.
_Source: IGNOU Concrete Technology, Unit 11 "Special Concrete" (Light Weight, Aerated, No-Fines, High Density, Fibre Reinforced, Polymer Concrete)._
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