The flakiness index of an aggregate sample is found by separating the flaky particles and expressing their mass as a percentage of the mass of the sample tested. Uta0410 flakiness index sieve set consists of 7 sieves. Faculty of civil and environmental engineering department. Flakiness and elongation test of aggregate as per is 2386. Test procedure for determining flakiness index txdot designation.
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. Take the aggregate sample which contains minimum 200 pieces of any fraction. As a conclusion, the sample that we tested are flaky and elongation, which is there are not suitable to use in parameter design. Objective for determination of elongation index of coarse aggregate, where the size of the coarse aggregate are larger than 6.
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. Theory of flakiness index and elongation index tests. Flakiness index and elongation index of coarse aggregates. The test is not applicable to material passing a 6.
Chapter 2 bituminous tex224f, determining flakiness index manual of testing procedures 1 899 1004 tex224f, determining flakiness index overview effective date. Determination of the flakiness and the elongation index for the given aggregate. It is expressed as the percentage by weight of particles in a sample of more than 200 whose smallest dimension is less than 0. Elongated and flaky stones are normally not very suitable for road works since the. The flakiness index test fi is not applicable passing 6. The particle shape of aggregate is determined by the percentages of flaky and elongated particles contained in it. Flakiness and elongation test construction aggregate road. Two procedures, method a and method b, are presented in this standard. Aggregate quality for road construction will also influence the road performance. Elongation index and flakiness index of coarse aggregate.
Flakiness and elongation test of aggregate as per is 2386 part 1, content aggregator duration. What is the significance of flakiness index and elongation index. Flakiness and elongation papworths construction testing equipment. The scope of this test is to provide test methods for determining the elongation index of coarse aggregate. In this text only flat and elongated particles in accordance with the procedure designated in method b will be covered.
Not so much different between both of the two values. 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. Flakiness and elongation index, properties and testing of. Elongation index is the % by weight of particles whose greater dimension is greater than 45 of the mean dimension elongation index wt of aggregate retained on specified gauge total wt of aggregate taken. Passirg elongation gauge s eve size mm 50 4025 25 20 20 16 12. Method a is a reflection of the original procedure as developed prior to superpave and is intended for all nonsuperpave applications. The particle shape of the aggregate is determined by. Shape tests on coarse aggregates such as flakiness index and elongation index. Objective for determination of flakiness index of coarse aggregate, where the size of the coarse aggregate are larger than 6. Determination of the flakiness and the elongation index. Mar 12, 2015 i flakiness index is the percentage by weight of particles in it, whose least dimension i.
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. Elongation index and flakiness index of coarse aggregate bs 812. Pdf determination of the flakiness and the elongation index for. The percentage by weight of flaky particles present in a given test sample. An aggregate is classified as being elongated if it has a. Determination of flakiness index, determination of elongation index, and determination of angularity number. 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 and elongation index test on coarse aggregates. Elongation value is 0% because the aggregate is rounded so no any retain value. Flakiness and elongation index of aggregate gilson co. Mar 03, 2012 the value that we get from this test is 15.
First section contains the standardized procedure for checking the mechanical properties aggregate impact value, aggregate crushing value, and ten percent fines value, and shape characteristics flakiness index, elongation index and. The total amount passing the gauge shall be weighed to an accuracy of at least 0. Elongation index and flakiness index of coarse aggregate bs. Definition of flakiness index and elongation index civil. Flakiness and elongation test of aggregate as per is 2386 part 1, content aggregator. The aggregate to be classified is separated into seven sieve fractions from 6. Flakiness and elongation test construction aggregate. The apparatus for the shape tests consists of the following. The presence of flaky or elongated particles in excess of 1015% of the weight of coarse aggregate is undesirable.
All the sieves include an electrostatically painted frame and stainless steel bars with a 5 mm diameter. The flakiness index of a sample is found by separating out the flakey particles and expressing their mass as a percentage of the total mass of the sample. The elongation index is found by separating the elongated particles and expressing their mass as a percentage of the mass of sample tested. When an aggregate particle has a thickness less than 0. Shape tests on coarse aggregates such as flakiness index and elongation index, its importance in concrete construction, methods of determination is discussed. The test apparatus consists of a standard thickness gauge 6. Is the combined flakiness and elongation index of aggregate. Aggregates which are flaky and elongated are detrimental to the higher. Respective references are provided with the test procedures.
Methods of test for aggregates for concrete, part i. Flakiness and elongation index of aggregate youtube. Determination of the flakiness and the elongation index for the given aggregate sample. Flakiness sieves, aggregates testing equipment, controls. While elongation index test is used to determine the quantity of aggregate particles that are elongated instead of cubicle in shape. Flakiness index test is not applicable for aggregates sizes smaller than 6. 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. Pdf determination of the flakiness and the elongation index. 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.
Dec 18, 2017 while elongation index test is used to determine the quantity of aggregate particles that are elongated instead of cubicle in shape. The dried aggregates sample is allowed to passing and retained on a set of sieve. In case of gravel it is determined by its angularity number. Flakiness and elongation flakiness index sieve set uta0410. This test method covers tests for flat particles, elongated particles, or flat and elongated particles in coarse aggregate. Determination of elongation index linkedin slideshare. The elongation index test procedure contains following steps. What is the significance of flakiness index and elongation. Sep 09, 2017 flakiness and elongation test of aggregate as per is 2386 part 1, content aggregator. Ce 354 transportation engineering sessional i lab manual. Elongation index is the percentage by weight of particles in it, whose largest dimension i. May 08, 20 objective for determination of elongation index of coarse aggregate, where the size of the coarse aggregate are larger than 6.
The percentage of flaky and elongated particles that it contains. May 08, 20 objective for determination of flakiness index of coarse aggregate, where the size of the coarse aggregate are larger than 6. Dec 24, 2018 recommended values of flakiness index. This procedure discusses how to determine the number of flat or elongated particles in a coarse aggregate material. Doc flakiness index and elongation index of coarse. Flakiness index total mass of aggregate pass slots mass of test sample x 100 where. Quarter the aggregate sample to obtain a minimum of 200 particles passing the 78in. What is the use of the elongation and flakiness index. Calculate the flakiness index to the nearest 0,1 as follows. Astm d4791 19 standard test method for flat particles. 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. Flakiness index sieve sets bs flakiness index utest.
Following tests are conducted on coarse aggregates under shape tests. Aug 11, 2014 the test apparatus consists of a standard thickness gauge 6. The aggregate retained on 63mm and passed through 6. Elongated and flaky stones are normally not very suitable for road works since the shape and the size make them difficult to compact. Flat and elongated particles of coarse aggregates have a tendency to fracture more easily than. Flakiness index is the percentage by weight of particles in it, whose least dimension i. 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. The amount of flakiness is denoted by flakiness index. 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. Retained on flakiness percentage of bakiness index. Aggregate is termed as flaky when its least dimension i.
Apr 07, 20 flakiness and elongation test of aggregate as per is 2386 part 1, content aggregator duration. The grid sieve set is used to determine the flakiness index of the aggregate. The test is carried on aggregate sizes between 63 mm and 6. The percentage by weight of the elongated particles present in a given test sample.
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