Question

If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than 1 point



a. 43.5 mm



b. 42.5 mm



c. 40.5 mm



d. 41.5 mm

Answer 1

the answer was ( b ) 42.5

Answer 2

Answer:

If the aggregate's minimum dimension is smaller than 40.5mm, it is considered flaky (c).

Explanation:

The flakiness is calculated as,

$F=\frac{3}{5}M$       (1)

Where,

F=flankiness

M=mean length

From the question we have,

The length through which the aggregate passes(l₁)=75mm

The length on which the aggregate is retained (l₂)=60mm

The mean length is calculated as,

$M=\frac{l_1+l_2}{2}$      (2)

By inserting the required values in equation (2) we get;

$M=\frac{75+60}{2}=67.5mm$    (3)

By inserting the value of M in equation (1) we get;

$F=\frac{3}{5}\times 67.5$

$F=40.5mm$

Hence, the correct answer among the given options is (c) i.e.40.5mm.

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