# Civil Engineering - Concrete Technology - Discussion

Discussion Forum : Concrete Technology - Section 4 (Q.No. 2)

2.

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

Discussion:

13 comments Page 1 of 2.
Abbas khan said:
3 years ago

If an aggregate is rounded or angular then what value will be use about dimension? Please explain.

Anurag said:
5 years ago

An aggregate is said to be flaky if its least dimension is less that 3-5.

That's why we use 3Ã·5.

That's why we use 3Ã·5.

(1)

Lalit said:
5 years ago

Flaky aggregate = 3/5 of there's mean dimension.

= (3/5) *{(75+60) /2}.

= (3/5) *(67.5).

= 40.5mm.

= (3/5) *{(75+60) /2}.

= (3/5) *(67.5).

= 40.5mm.

(16)

Yasir said:
6 years ago

Flakiness means 60%(3/5) of avg size of particles.

Avijit mirdda said:
7 years ago

Average of 75mm and 60 mm sieve is (75+60)/2=67.5.

For flaky if its minimum dimension is less than 3/5 of 67.5 i.e. 67.5*(3/5) = 40.5mm.

For flaky if its minimum dimension is less than 3/5 of 67.5 i.e. 67.5*(3/5) = 40.5mm.

(1)

Sandeep kumar said:
7 years ago

Since we know.

Flakiness index= .6(3/5)* average size of aggregate((passing size+retained size)/2).

So it is 40.5mm.

Flakiness index= .6(3/5)* average size of aggregate((passing size+retained size)/2).

So it is 40.5mm.

(1)

Abhi said:
7 years ago

Flakiness means 3/5 of mean size of aggregate, therefore it is 40.5.

(1)

Sankalp kadam said:
8 years ago

If avg has be taken into account then according to me, as agg are retained on 60mm sieve size so it means that most of the agg are retained at 60 so we have to consider that value only rather than taking commutative of two sieve sizes isn't it?

Means (3/5) * 60 that comes 36mm.

Means (3/5) * 60 that comes 36mm.

G.V.S. Bhargav said:
9 years ago

Flaky aggregate is a aggregate having a size less than 60% of average size of the two aggregate.

So now (75+60)/2 = 67.5.

Now 60% of 67.5 is,

That is 67.5*(60/100) = 40.5.

So now (75+60)/2 = 67.5.

Now 60% of 67.5 is,

That is 67.5*(60/100) = 40.5.

ITAF HUSSAIN said:
1 decade ago

@prahumac we multiply it by 3/5 of its mean dimension

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