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