Shape test (Lab)
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This document describes tests for determining the flakiness and elongation of aggregate particles used in pavement construction. It defines flakiness and elongation indices, which measure the percentage of particles that are less than 0.6 times and greater than 1.8 times their mean dimension, respectively. Thickness and length gauges are used to measure particles from various sieve sizes. The procedure involves weighing samples, passing them through the gauges, and calculating the indices based on retained and passing weights. Specifications from IRC 111 2009 and relevant standards like IS 2386 are referenced.
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Shape test (Lab)
- 1. Pavement Material Lab Shape Test Priyansh Singh Department of Civil Engineering Indian Institute of Technology Delhi catchpriyansh@gmail.com web.iitd.ac.in/~cez138070 Pavement Engg. Lab 4th February 2015
- 2. Pavement Material Lab Flakiness and Elongation Test 4th February 2015 2/16 Introduction
- 3. Pavement Material Lab Flakiness and Elongation Test 4th February 2015 3/16 Introduction
- 4. Pavement Material Lab Flakiness and Elongation Test 4th February 2015 4/16 Flat Particles Particles whose least dimension is less than 0.6 times its mean dimension. Flakiness Index Its percentage of that mass of aggregate whose least dimension is less than 0.6 times its mean dimension. Applicable to particles greater the 6.3mm size
- 5. Pavement Material Lab Flakiness and Elongation Test 4th February 2015 5/16 Thickness Guage
- 6. _-- i 5: 9 2 j J ‘t THESE SIZES MARKED ON GAUGE %Jj’_ -___--____________-------- -_----__-_-_-____-_------- ..!.i._ ““1--- _---_“7T~~_ ____ -__ ______ _____-__-------_. ,_., ___--__-_____-____--------------------- 1.6 mm THICK MS SHEET ROLLED OVER 8mm ($ BAR Sll dimensions in millimetres. FIG. 2 TEICKXESSGAUGE Pavement Material Lab Flakiness and Elongation Test 4th February 2015 6/16
- 7. Pavement Material Lab Flakiness and Elongation Test 4th February 2015 7/16 Elongated Particles Particles whose longest dimension is greater than 1.8 times its mean dimension. Elongation Index Its percentage of that mass of aggregate whose longest dimension is greater than 1.8 times its mean dimension.. Applicable to particles greater the 6.3mm size
- 8. Pavement Material Lab Flakiness and Elongation Test 4th February 2015 8/16 Length Guage
- 9. Pavement Material Lab Flakiness and Elongation Test 4th February 2015 9/16
- 10. for the appropriate size of material. TABLE V DIMENSIONS OF THICKNESS AND LENGTH GAUGES (Clauses 4.2, 4.4.1, 4.4.2, 5.2 and 5.4.1 ) SIZE OF AQQBE~ATE r------- h______-__~ Pass$gTFeough Retained On i IS Sieve (1) (2) THICENE~S GAUC+E* (3) mm LENQTH GanaEt (4) mm 63-mm 50-mm 40-mm 31*&mm 25-mm 20-mm 16-mm 12.5-mm 1O-mm 50-mm 40-mm 25-mm P&mm 20-mm 16-mm 12%mm lo-mm 6.3-mm 33.90 27.00 19.60 16’95 13’50 10.80 8’55 6’75 4.89 ST0 58’6 4;5 32.4 25% 262 14.7 *This dimension is equal to 0.6 times the mean sieve size. tThis dimension is equal to I.8 times the mean sieve size. Pavement Material Lab Flakiness and Elongation Test 4th February 2015 10/16 Test Procedure
- 11. Pavement Material Lab Flakiness and Elongation Test 4th February 2015 11/16 Test Procedure Take the aggregate passing form specific sieve sizes such that you get minimum 200 particles for a particular size. Take weights (pi). Pass / retain through Thickness/ length gauge. Take the weight of passed/retained aggregates (qi). Flakiness/Elongation index = m i piqi (1)
- 12. Pavement Material Lab Flakiness and Elongation Test 4th February 2015 12/16 Combined Flakiness Elongation Index Conduct the Elongation index test to the aggregates which are passing for flakiness index. Take the weight which passes both the test. Determine percentage.
- 13. Pavement Material Lab Flakiness and Elongation Test 4th February 2015 13/16 Specification IRC 111 2009
- 14. Pavement Material Lab Flakiness and Elongation Test 4th February 2015 14/16 Relevant Standards IS:2386-part 1
- 15. Pavement Material Lab Flakiness and Elongation Test 4th February 2015 15/16 References P. Chakorborty and A. Das. Principles of Transportation Engineering. PHI Learning (formerly Prentice Hall of India), 2003. SK Khanna and CEG Justo. Highway engineering. Nem Chand & Bros, 1991.
- 16. Indian Institute of Technology Delhi Pavement Material Lab Priyansh Singh Webpage: web.iitd.ac.in/~cez138070 Questions ? Thanks !