Which of the following plastics is used in fiber-reinforced composites for bridges and structural applications?

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RRB JE CE 22 Apr 2025 Shift 1 CBT 2 Official Paper
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  1. Acrylic
  2. Acrylonitrile Butadiene Styrene
  3. Epoxy resin
  4. Nylon

Answer (Detailed Solution Below)

Option 3 : Epoxy resin
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Detailed Solution

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Explanation:

Fiber-Reinforced Composites (FRC)

  • High strength and stiffness: Essential for structural applications like bridges.

  • Excellent adhesion to reinforcing fibers (e.g., glass, carbon, aramid).

  • Durable and chemical-resistant: Withstands environmental exposure.

  • Thermosetting polymer: Once cured, it doesn’t soften or melt under heat.

Additional Information

Acrylic

  • Used in displays and signs (like Plexiglass), not suitable for structural loads.

Acrylonitrile Butadiene Styrene (ABS)

  • A tough thermoplastic used in consumer products (like LEGO), not ideal for high-stress structures.

Nylon

  • Known for flexibility and wear resistance but not strong or rigid enough for load-bearing FRC applications.

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