The elongation index is found by separating the elongation particles and expressing their mess as a percentage of the mass of sample tested. Flakiness index test is conducted by using a metal thickness gauge. It is expressed as the percentage by weight of particles in a sample of more than 200 whose smallest dimension is less than 0. Faculty of civil and environmental engineering department. Flakiness and elongation papworths construction testing equipment. Not so much different between both of the two values. Flakiness and elongation test of aggregate, flakiness and elongation test of aggregate, flakiness and elongation test, flakiness and elongation test is code, flakiness and elongation test video. Flakiness and elongation test of aggregate as per is 2386. What is the significance of flakiness index and elongation index. Flakiness index is the percentage by weight of particles in it, whose least dimension i. Flakiness and elongation test construction aggregate. Length gauge elongation index has six labeled openings between metal pins for measuring length of particles from each of the six sieve cuts below 50mm, for elongation index determinations. Aggregate quality for road construction will also influence the road performance. Flaky or elongated course aggregates are disadvantageous to higher workability and stability of mixes.
Flat and elongated particles of coarse aggregates have a tendency to fracture more easily than. The equipment used in the flakiness index are also used in the elongation index test except a metal length gauge instead of a thickness gauge shown in figure 7. Theory of flakiness index and elongation index tests. Elongation index and flakiness index of coarse aggregate bs. The test apparatus consists of a standard thickness gauge 6. The flakiness index test fi is not applicable passing 6. The grid sieve set is used to determine the flakiness index of the aggregate. This procedure discusses how to determine the number of flat or elongated particles in a coarse aggregate material. Mar 12, 2015 i flakiness index is the percentage by weight of particles in it, whose least dimension i. Flakiness index and elongation index of coarse aggregates. Astm d4791 19 standard test method for flat particles. Elongation index is the percentage by weight of particles in it, whose largest dimension i. Doc flakiness index and elongation index of coarse. Determination of elongation index linkedin slideshare.
Methods of test for aggregates for concrete, part i. Take the aggregate sample which contains minimum 200 pieces of any fraction. This material is advisory only and its use or adaptation is entirely voluntary. How the elongation index of the sample helps in deciding the design of a highway.
Elongated and flaky stones are normally not very suitable for road works since the. Dec 18, 2017 while elongation index test is used to determine the quantity of aggregate particles that are elongated instead of cubicle in shape. Flakiness sieves, aggregates testing equipment, controls. Determination of the flakiness and the elongation index for the given aggregate.
Pdf determination of the flakiness and the elongation index for. The percentage by weight of the elongated particles present in a given test sample. It shall comply with the appropriate minimum mass, for sieve analysis with due allowance for 63. Flakiness index test is not applicable for aggregates sizes smaller than 6. Uta0410 flakiness index sieve set consists of 7 sieves. The sample for this test shall be taken in accordance with bs 812. Mar 03, 2012 the value that we get from this test is 15. What do you mean by flakiness index of an aggregate. Determination of flakiness index, determination of elongation index, and determination of angularity number. Exp 1 flakiness and elongation index civil engineers pk. Elongation index and flakiness index of coarse aggregate bs 812. Flakiness and elongation index of aggregate youtube. What is the use of the elongation and flakiness index.
The test is carried on aggregate sizes between 63 mm and 6. The aggregate to be classified is separated into seven sieve fractions from 6. When an aggregate particle has a thickness less than 0. Thickness gauge flakiness index is a slotted stainless steel gauge for rapid hand trying of particles from the seven sieve fractions to determine the flakiness index. In this experiment, flakiness index was used as independent variables and other properties such as gradation are kept constant as far as their properties met the specification required for the asphalt mixture. The dried aggregates sample is allowed to passing and retained on a set of sieve. The total amount passing the gauge shall be weighed to an accuracy of at least 0. Determination of the flakiness and the elongation index for the given aggregate sample.
Retained on flakiness percentage of bakiness index. Flakiness and elongation test of aggregate as per is 2386 part 1, content aggregator duration. Sep 09, 2017 flakiness and elongation test of aggregate, flakiness and elongation test of aggregate, flakiness and elongation test, flakiness and elongation test is code, flakiness and elongation test video. Flakiness and elongation flakiness index sieve set uta0410. The flakiness index is the total weight of the material passing the various thickness gauges or sieves, expressed as a percentage of the total weight of the sample gauged. Flakiness index and elongation index test on coarse aggregates. Apr 07, 20 flakiness and elongation test of aggregate as per is 2386 part 1, content aggregator duration. Flakiness and elongation test construction aggregate road. Shape tests on coarse aggregates such as flakiness index and elongation index, its importance in concrete construction, methods of determination is discussed. Flakiness and elongation test free download as word doc. Elongation index and flakiness index of coarse aggregate. What do you mean by elongation index of an aggregate.
The percentage of flaky and elongated particles that it contains. The flakiness index of course aggregate is defined in percentage by weight of aggregate particles and least dimension thickness of those particles should not be less than 0. Elongation and flakiness test free download as word doc. Conclusion based on the objective for this experiment is to identify the flakiness and elongation index of the given aggregrate samples, we indentified the flakiness and elongation is not influenced each other. The apparatus for the shape tests consists of the following. The elongation index test procedure contains following steps.
Method a is a reflection of the original procedure as developed prior to superpave and is intended for all nonsuperpave applications. Aggregates which are flaky and elongated are detrimental to the higher. The elongation index of an aggregate is the percentage by weight of particles whose greatest dimension length is. This test method covers tests for flat particles, elongated particles, or flat and elongated particles in coarse aggregate.
Tensilestrength,elongation,andmodulus date 795 revision originatingtaskgroup depositeddielectrictaskgroupca material in this test methods manual was voluntarily established by technical committees of the ipc. Passirg elongation gauge s eve size mm 50 4025 25 20 20 16 12. Tensilestrength, elongation,andmodulus date 795 revision originatingtaskgroup depositeddielectrictaskgroupca material in this test methods manual was voluntarily established by technical committees of the ipc. Flakiness and elongation index of aggregate gilson co. May 08, 20 objective for determination of elongation index of coarse aggregate, where the size of the coarse aggregate are larger than 6.
Following tests are conducted on coarse aggregates under shape tests. Test procedure for determining flakiness index txdot designation. May 08, 20 objective for determination of flakiness index of coarse aggregate, where the size of the coarse aggregate are larger than 6. Elongation and flakiness test construction aggregate. Pdf determination of the flakiness and the elongation. Is the combined flakiness and elongation index of aggregate. The aggregate retained on 63mm and passed through 6. The flakiness index of aggregates is the percentage by weight of particles whose least dimension thickness is less than three fifths 0. Two procedures, method a and method b, are presented in this standard.
All the sieves include an electrostatically painted frame and stainless steel bars with a 5 mm diameter. The elongation index is found by separating the elongated particles and expressing their mass as a percentage of the mass of sample tested. The particle shape of aggregate is determined by the percentages of flaky and elongated particles contained in it. Shape tests on coarse aggregates such as flakiness index and elongation index. Flakiness index sieve sets bs flakiness index utest. Dec 18, 2017 the elongation index is found by separating the elongation particles and expressing their mess as a percentage of the mass of sample tested. Elongated and flaky stones are normally not very suitable for road works since the shape and the size make them difficult to compact. Length gauge elongation index has six labeled openings between metal pins for measuring length of particles from each of the six sieve cuts below 50mm, for elongation index.
It is mentioned in the test procedure bismorth that while doing combined flakiness and elongation test, the flaky aggregates should be separated initially from the test sample, and the rest is. Aug 11, 2014 the test apparatus consists of a standard thickness gauge 6. The percentage by weight of flaky particles present in a given test sample. In case of gravel it is determined by its angularity number. The presence of flaky or elongated particles in excess of 1015% of the weight of coarse aggregate is undesirable. In this text only flat and elongated particles in accordance with the procedure designated in method b will be covered. Elongation value is 0% because the aggregate is rounded so no any retain value. The equipment used in the flakiness index are also used in the elongation index test except a metal length gauge instead of a thickness gauge shown in.
Pdf determination of the flakiness and the elongation index. Quarter the aggregate sample to obtain a minimum of 200 particles passing the 78in. While elongation index test is used to determine the quantity of aggregate particles that are elongated instead of cubicle in shape. Dec 24, 2018 recommended values of flakiness index. Objective for determination of elongation index of coarse aggregate, where the size of the coarse aggregate are larger than 6. The test is not applicable to material passing a 6. Definition of flakiness index and elongation index civil.
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