Question

If aggregate completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the aggregates will be known as elongated aggregate if its length is not less than

• A. 8.15 mm
• B. 91.5 mm
• C. 101.5 mm
• D. 121.5

Answer 1

The correct option is D 121.5

The aggregates are said to be elongated if their dimension is more than 1.8 times the mean dimension.

It is given that aggregates pass through sieve of 45 mm and retained on a sieve of size 60 mm,

$meandimensionoftheaggregate=\frac{60+75}{2}=67.5mm$.

Therefore, aggregates will be known as elongated if its length is more then $1.8\times 67.5=121.5mm.$