Dry density of soil compaction test by core cutter method and calculations road construction civil. Not so much different between both of the two values. Determination of the flakiness and the elongation index for the given aggregate sample. Definition the flakiness index of aggregates is the percentage by weight of particles whose least dimension thickness is less than 0. Definition of flakiness index and elongation index civil. Commercially available slotted sieves for testing grain or seeds are used. This procedure discusses how to determine the number of flat or elongated particles in a coarse aggregate material. Flaky index it is the percentage by weight of flaky particles in a sample.
Aggregate retained on the 75 mm and passing the 4,75 mm sieve is not included in the test. The test is not applicable to material passing a 6. This paper describes the importance of the particle shape of aggregates in road structures, and their determination, especially using the flakiness index test. Elongation and flakiness test construction aggregate. Elongated and flaky stones are normally not very suitable for road works since the shape and the size make them difficult to compact. Conclusion after carried out the test, the flakiness index of the collected sample is determined. Determination of elongation index linkedin slideshare. The method makes reference to a particle size distribution procedure which is required for determination of flakiness index. The particle shape of the aggregate is determined by. What is the significance of flakiness index and elongation index. The mould is placed on a smooth, horizontal rigid and non absorbent surface. Flakiness and elongation index of aggregate youtube. Flakiness index is the percentage by weight of particles in it, whose least dimension i. Pdf determination of the flakiness and the elongation index for.
In order to determine the effect of flakiness index on the bituminous mix, a number of aggregate test. All the sieves include an electrostatically painted frame and stainless steel bars with a 5 mm diameter. Elongation index and flakiness index of coarse aggregate. Respective references are provided with the test procedures. Flakiness index and elongation index of coarse aggregates. This paper describes the development of a test for measuring the amount of flaky particles in fine aggregate. 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. Tex224f, determining flakiness index overview effective date. Flakiness index test is applicable on those aggregate sizes bigger than 6. It is expressed as the percentage by weight of particles in a sample of more than 200 whose smallest dimension is less than 0. Ce 354 transportation engineering sessional i lab manual. The flakiness index of a coarse aggregate is determined by gauging screenedout fractions with the appropriate slots given in table i below. As such the flakiness and elongation test must be carried out to determine the suitability of the material.
Read chapter chapter 6 conclusions and recommendations. Chapter 6 conclusions and recommendations aggregate. Flakiness index and elongation index test on coarse aggregates. Trbs national cooperative highway research program nchrp report 539. The elongation index of aggregates is the percentage by weight of particles whose greatest. 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. This process is carried out when the aggregate proportions such as coarse, fine and dust is identified. Is the combined flakiness and elongation index of aggregate is the numerical sum of separate elongation index and flakiness index. Shape tests on coarse aggregates such as flakiness index and elongation. This standard sets out a method for determining the flakiness index of an aggregate. Definition the flakiness index of a coarse aggregate is the mass of particles in that aggregate. The percentage by weight of flaky particles present in a given test sample.
Ariz 233d december 4, 2015 8 pages flakiness index of coarse aggregate an arizona method 1. The method applies to aggregates having a nominal size not greater than 63. 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 100 x m 3 m 2 express the flakiness index to the nearest whole. Exp 1 flakiness and elongation index civil engineers pk.
Construction technology and management 42,160 views. The test apparatus consists of a standard thickness gauge 6. Elongation index is the percentage by weight of particles in it, whose largest dimension i. Retained on flakiness percentage of bakiness index. 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. 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. But, different bituminous mix may require different proportion of flaky aggregates. The dried aggregates sample is allowed to passing and retained on a set of sieve. 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. Objective for determination of elongation 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.
Quarter the aggregate sample to obtain a minimum of 200 particles passing the 78in. As a conclusion, the presence of flaky aggregate is affected the asphalt content and marshall properties for ac14 mix. The flakiness index test fi is not applicable passing 6. While elongation index test is used to determine the quantity of aggregate particles that are elongated instead of cubicle in shape. Separation of elongated material each fraction shall be gauged individually for length on a metal. Pdf determination of the flakiness and the elongation. The percentage of flaky and elongated particles that it contains.
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