Shape Test

TENZIN KESANG EDC2012060

TENZIN WANGCHUK EDC2012061

TSHERING DEMA EDC2012064

TSHERING DORJI EDC2012065

THERING PEM EDC2012066

Introduction

Determination of particle shapeTypes of particle shapePreference of aggregate shape in cement

concrete road

Flakiness index Definition: It is the percentage by weight of particles whose least

thickness is less than three-fifth (0.6) of their mean dimension. Apparatus – IS sieves, weighing balance and standard thickness gauge

Procedure (flakiness index) Sieve the sample as per the aggregate size 100 pieces to be retained in each sieve Weigh the aggregates minus the sieve weight of each sieve (W1) Pass the aggregates through the thickness gauge Weigh the aggregates passing through the respective thickness gauge (W2) Calculate the flakiness index

Flakiness index = (W2/W1) * 100

where,

W1 = total weight of the sample gauged

W2 = total weight of the sample passing through various thickness gauge

Elongation indexDefinition: It is the percentage by weight of particles whose

greatest length is greater than one and four fifth (1.8 times) their mean dimension.

Apparatus –IS sieves, weighing balance and length gauge

Procedure (elongation index) Sieve the sample as per the aggregate size 100 pieces to be retained in each sieve Weigh the aggregates minus the sieve weight of each sieve (W1) Pass the aggregates through the length gauge Weigh the aggregates retained on the respective length gauge (W2) Calculate the elongation index

flakiness index = (W2/W1) * 100

where,

W1 = total weight of the sample gauged

W2 = total weight of the sample retained on various length gauge

Application Usage of particle shape in pavement construction In cement concrete

Sl. No.

Type of construction Maximum limit of flakiness index

1 Water bound macadam 152 Bituminous surface dressing, penetration

macadam, carpet25

3 Bituminous bound macadam, bituminous concrete

15

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