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Q: Identify the group of concrete having 20 N/mm² specified characteristic compressive strength of 150 mm cubes at 28 days?
  • A. Composite strength concrete
  • B. Ordinary concrete
  • C. High strength concrete
  • D. Standard concrete
Correct Answer: Option B - As per IS 456:2000, • Ordinary grade of concrete = 3 Nos (M10, M15, M20) • Standard grade of concrete = 8 Nos (M25, M30, M40, M45, M50, M55, M60) • High strength grade of concrete=8 Nos (M65 to M100)
B. As per IS 456:2000, • Ordinary grade of concrete = 3 Nos (M10, M15, M20) • Standard grade of concrete = 8 Nos (M25, M30, M40, M45, M50, M55, M60) • High strength grade of concrete=8 Nos (M65 to M100)

Explanations:

As per IS 456:2000, • Ordinary grade of concrete = 3 Nos (M10, M15, M20) • Standard grade of concrete = 8 Nos (M25, M30, M40, M45, M50, M55, M60) • High strength grade of concrete=8 Nos (M65 to M100)