As a conclusion, the presence of flaky aggregate is affected the asphalt content and marshall properties for ac14 mix. Is the combined flakiness and elongation index of aggregate is the numerical sum of separate elongation index and flakiness index. The test is carried on aggregate sizes between 63 mm and 6. Commercially available slotted sieves for testing grain or seeds are used. The percentage by weight of the elongated particles present in a given test sample. Determination of the flakiness and the elongation index for the given aggregate sample. Flakiness and elongation index of aggregate youtube. The elongation index of aggregates is the percentage by weight of particles whose greatest. Flakiness index test is not applicable for aggregates sizes smaller than 6. The test apparatus consists of a standard thickness gauge 6. Elongation index and flakiness index of coarse aggregate. Read chapter chapter 6 conclusions and recommendations.
Ariz 233d december 4, 2015 8 pages flakiness index of coarse aggregate an arizona method 1. Exp 1 flakiness and elongation index civil engineers pk. Elongation value is 0% because the aggregate is rounded so no any retain value. This paper describes the development of a test for measuring the amount of flaky particles in fine aggregate.
Aggregate retained on the 75 mm and passing the 4,75 mm sieve is not included in the test. 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. Pdf determination of the flakiness and the elongation. Not so much different between both of the two values. Another tool detects changes in the flakiness level of tests and works to identify the change that caused the test to change the level of flakiness. It is expressed as the percentage by weight of particles in a sample of more than 200 whose smallest dimension is less than 0. Flakiness index test is applicable on those aggregate sizes bigger than 6. The grid sieve set is used to determine the flakiness index of the aggregate. This paper describes the importance of the particle shape of aggregates in road structures, and their determination, especially using the flakiness index test. All the sieves include an electrostatically painted frame and stainless steel bars with a 5 mm diameter. Elongation index is the percentage by weight of particles in it, whose largest dimension i. Pdf determination of the flakiness and the elongation index for. Effect of aggregate flakiness on the compressive strength. The test is not applicable to material passing a 6.
Quarter the aggregate sample to obtain a minimum of 200 particles passing the 78in. Separation of elongated material each fraction shall be gauged individually for length on a metal. As such the flakiness and elongation test must be carried out to determine the suitability of the material. Chapter 6 conclusions and recommendations aggregate. What is the significance of flakiness index and elongation index. The elongation index is found by separating the elongation particles and expressing their mess as a percentage of the mass of sample tested. Objective for determination of elongation index of coarse aggregate, where the size of the coarse aggregate are larger than 6. This process is carried out when the aggregate proportions such as coarse, fine and dust is identified. Flakiness index and elongation index test on coarse aggregates.
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. What is the significance of flakiness index and elongation. 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. The method applies to aggregates having a nominal size not greater than 63. The dried aggregates sample is allowed to passing and retained on a set of sieve. The flakiness index test fi is not applicable passing 6. Definition the flakiness index of aggregates is the percentage by weight of particles whose least dimension thickness is less than 0. Flakiness index and elongation index of coarse aggregates. 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. Dry density of soil compaction test by core cutter method and calculations road construction civil. Effect of flakiness index on bituminous mixes ijsetr. Flaky index it is the percentage by weight of flaky particles in a sample. While elongation index test is used to determine the quantity of aggregate particles that are elongated instead of cubicle in shape.
The mould is placed on a smooth, horizontal rigid and non absorbent surface. 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. Flakiness index is the percentage by weight of particles in it, whose least dimension i. In order to determine the effect of flakiness index on the bituminous mix, a number of aggregate test. This standard sets out a method for determining the flakiness index of an aggregate. But, different bituminous mix may require different proportion of flaky aggregates. Elongation and flakiness test construction aggregate. Tex224f, determining flakiness index overview effective date. The value of the flakiness index is calculated from the expression. Construction technology and management 42,160 views. The flakiness index of a coarse aggregate is determined by gauging screenedout fractions with the appropriate slots given in table i below. This procedure discusses how to determine the number of flat or elongated particles in a coarse aggregate material.
Definition the flakiness index of a coarse aggregate is the mass of particles in that aggregate. The percentage of flaky and elongated particles that it contains. Determination of the flakiness and the elongation index for the given aggregate. Ce 354 transportation engineering sessional i lab manual. The percentage by weight of flaky particles present in a given test sample. The particle shape of the aggregate is determined by. Retained on flakiness percentage of bakiness 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. Flakiness and elongation test construction aggregate road. Definition of flakiness index and elongation index civil. Respective references are provided with the test procedures. The method makes reference to a particle size distribution procedure which is required for determination of flakiness index. Flakiness index 100 x m 3 m 2 express the flakiness index to the nearest whole. Conclusion after carried out the test, the flakiness index of the collected sample is determined.
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