Flakiness index 100 x m 3 m 2 express the flakiness index to the nearest whole number. Is the combined flakiness and elongation index of aggregate is the numerical sum of separate elongation index and flakiness index. The elongation index test procedure contains following steps. The presence of flaky or elongated particles in excess of 1015% of the weight of coarse aggregate is undesirable. Determination of the flakiness and the elongation index for the given aggregate. Methods of test for aggregates for concrete, part i. While elongation index test is used to determine the quantity of aggregate particles that are elongated instead of cubicle in shape. It is the percentage by weight of flaky particles in a sample. Exp 1 flakiness and elongation index civil engineers pk. This test is not applicable for sizes smaller than 6. Pdf determination of the flakiness and the elongation index for. Take the aggregate sample which contains minimum 200 pieces of any fraction. Sieve the sample through the is sieves as specified in.
Flakiness and elongation test of aggregate as per is 2386. 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. Both flakiness and elongation tests are not applicable to sizes smaller than 6. Elongation index aggregate particles are classified as elongation when they have a length. Pdf determination of the flakiness and the 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. Thus, evaluation of shape of the particles, particularly with reference to flakiness and elongation is necessary.
Objective particle shape and surface texture influence the properties of freshly mixed concrete more than the properties of hardened concrete. Determination of the flakiness and the elongation index for the given aggregate sample. Test procedure 2 transportation engineereing 2015civ for the. Doc flakiness index and elongation index of coarse. 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. Flakiness index and elongation index test on coarse aggregates. Flakiness index and elongation index of coarse aggregates. Elongation index and flakiness index of coarse aggregate. Flakiness and elongation test of aggregate as per is 2386 part 1, content aggregator. Flaky index it is the percentage by weight of flaky particles in a sample. It is mentioned in the test procedure bismorth that while. Perform the sieve analysis on the given aggregate sample. 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 test construction aggregate road. Flakiness and elongation index of aggregate youtube. The total amount passing the gauge shall be weighed to an accuracy of at least 0. Where, m 2 is the total mass of test portion m 3 is the mass of the flaky portion. The aggregate retained on 63mm and passed through 6. Roughtextured, angular, and elongated particles require more water to produce workable concrete than smooth, rounded compact aggregate.
Flakiness and elongation test of aggregate as per is 2386 part 1. The value of the flakiness index is calculated from the expression. This test is not applicable to sizes smaller than 6. The flakiness index of aggregates is the percentage by weight of particles whose least dimension thickness is less than three fifths 0. Elongation index and flakiness index of coarse aggregate bs 812. Aggregate size mm sample weight kg distance between the passing from retained on bars of elongation scale 63 50 50 50 37.1552 778 934 552 1300 1354 658 160 983 1472 246 1261 959 61 972 1141 800 930 682 1435 1362 326 1250 834 914 487 374 510 1488 933 941 481