Explain flakiness index and elongation index in detail.

Explain flakiness index and elongation index in detail.
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Flakiness Index: It is the percentage by weight of particles whose least dimension (thickness) is less than (3/5)th of its mean dimension passing through thickness gauge. It is determined by testing minimum 200 aggregate particles on thickness gauge. All the particles of initial weight W1 gm are passed through various sizes along its thickness. The weight of aggregate particles passed through various sizes is taken as W2 gm. Finally flakiness index of given aggregate sample is calculated by using formula Flakiness Index = (W2/ W1) x100 %.

Elongation Index: It is the percentage by weight of particles whose greatest dimension (length) is more than (14/5)th of its mean dimension retained on length gauge. It is determined by testing minimum 200 aggregate particles on length gauge. All the particles of initial weight W1 gm are passed through various sizes along its length. The weight of aggregate particles retained through various sizes is taken as W2 gm. Finally elongation index of given aggregate sample is calculated by using formula Elongation Index = (W2/ W1) x100 %.
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