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Q: IS 456-2000 suggests that the maximum size of coarse aggregate to be used in plain cement concrete and reinforced cement concrete recommended should NOT be more than :
  • A. one-fourth of the minimum dimension of the concrete member
  • B. the maximum clear spacing between reinforced bars
  • C. one-fourth of the maximum dimension of the concrete member
  • D. one-fifth of the maximum dimension of the reinforced concrete member
Correct Answer: Option A - As per IS 456 : 2000 Clause 5.3.3 - • The nominal maximum size of coarse aggregate should be as large as possible within the limits specified but in no case greater than one-fourth of the minimum thickness of the member. • For most work 20 mm aggregate is suitable. • Where there is no restriction to the flow of concrete into section 40 mm or larger size may be permissible.
A. As per IS 456 : 2000 Clause 5.3.3 - • The nominal maximum size of coarse aggregate should be as large as possible within the limits specified but in no case greater than one-fourth of the minimum thickness of the member. • For most work 20 mm aggregate is suitable. • Where there is no restriction to the flow of concrete into section 40 mm or larger size may be permissible.

Explanations:

As per IS 456 : 2000 Clause 5.3.3 - • The nominal maximum size of coarse aggregate should be as large as possible within the limits specified but in no case greater than one-fourth of the minimum thickness of the member. • For most work 20 mm aggregate is suitable. • Where there is no restriction to the flow of concrete into section 40 mm or larger size may be permissible.