Flakiness and elongation test construction aggregate road. Doc flakiness index and elongation index of coarse. Is the combined flakiness and elongation index of aggregate is the numerical sum of separate elongation index and flakiness index. It is the percentage by weight of flaky particles in a sample. Pdf determination of the flakiness and the elongation index for. Perform the sieve analysis on the given aggregate sample. Determination of the flakiness and the elongation index for the given aggregate sample. While elongation index test is used to determine the quantity of aggregate particles that are elongated instead of cubicle in shape. Flakiness index and elongation index of coarse aggregates. Elongated and flaky stones are normally not very suitable for road works since the shape and the size make them difficult to compact.
Flakiness index 100 x m 3 m 2 express the flakiness index to the nearest whole number. Flaky index it is the percentage by weight of flaky particles in a sample. Flakiness and elongation test of aggregate as per is 2386. Objective particle shape and surface texture influence the properties of freshly mixed concrete more than the properties of hardened concrete. 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 total amount passing the gauge shall be weighed to an accuracy of at least 0. Flakiness and elongation test of aggregate as per is 2386 part 1, content aggregator. Take the aggregate sample which contains minimum 200 pieces of any fraction. Place the sample and pan in an oven and dry at a temperature between 100 and 300f 38 and 150c until sufficiently dry for testing. Elongation index aggregate particles are classified as elongation when they have a length. Thus, evaluation of shape of the particles, particularly with reference to flakiness and elongation is necessary.
Exp 1 flakiness and elongation index civil engineers pk. Flakiness and elongation test of aggregate as per is 2386 part 1. Methods of test for aggregates for concrete, part i. The presence of flaky or elongated particles in excess of 1015% of the weight of coarse aggregate is undesirable. This test is not applicable for sizes smaller than 6. The aggregate retained on 63mm and passed through 6. It is mentioned in the test procedure bismorth that while. Determination of the flakiness and the elongation index for the given aggregate.
The elongation index test procedure contains following steps. This test is not applicable to sizes smaller than 6. Sieve the sample through the is sieves as specified in. Elongation index and flakiness index of coarse aggregate. Flakiness index and elongation index test on coarse aggregates. The value of the flakiness index is calculated from the expression. Flakiness and elongation index of aggregate youtube. Test procedure 2 transportation engineereing 2015civ for the. Pdf determination of the flakiness and the elongation. Where, m 2 is the total mass of test portion m 3 is the mass of the flaky portion. Elongation index and flakiness index of coarse aggregate bs 812.
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