Question

Statement (i): There is no practical method of concrete mix design based on the specific surface of aggregates.
Statement (ii): Surface area of aggregates plays a vital role in achieving the right mix desired for a desired strength.

• A. Both statements - I and statements-II are individually true and statement-II is the correct explanation of statement- I
• B. Both statements - I and statements-II are individually true and statement-II is the NOT correct explanation of statement- I
• C. Statement- I is true but Statement-II is false.
• D. Statement- I is false but Statement-II is true.

Answer 1

The correct option is B Both statements - I and statements-II are individually true and statement-II is the NOT correct explanation of statement- I

Statement-I is true
No practical concrete mix design methods are available at present. which are purely based on specific surface of aggregate, However, in ACI and BIS methods specific surface of cement is used in the design.
Statement-II is true.
With specific surface of aggregates, the angularity and fineness modulus can be calculated, which in turn can be used in concrete mix design.