· Home Testmethods DETERMINATION OF FLAKINESS AND ELONGATION INDEX OF COARSE AGGREGATE AS PER IS 2386 PART 1 DETERMINATION OF FLAKINESS AND ELONGATION INDEX OF COARSE AGGREGATE AS PER IS 2386 PART 1 Nadim Solanki March 16, 2018. IN THIS ARTICLE WE WILL LEARN ABOUT TEST METHOD .

Flakiness index and Elongation Index of Coarse Aggregates AIM: i. to determine the elongation index of the given aggregates ii. to determine the flakiness index of the given aggregates APPARATUS: The apparatus for the shape tests consists of the following: (i) A standard thickness gauge (ii) A standard length gauge (iii) IS sieves of sizes 63, 50 40,, 25, 20, 16,,10 and (iv) .

 · Significance : Coarse aggregate having flakier particles will adversely affect the strength of concrete. Definition : The flakiness index of the aggregate is the percentage by weight of particles in it, whose least dimension (thickness) is less than three fifth of their mean dimension. Apparatus : Balance, Metal guage, Sieve set.

DETERMINATION OF FLAKINESS INDEX of. Course Aggregate • Objective: To determine the flakiness index of the given sample of Coarse aggregate. • Apparatus and Materials: • Tray • Trowel • Aggregate sample (Coarse aggregates dry) • Length gauge • Sieves [63, 50,, 28, 20, 14, 10 ] • Balance [010 kg] THICKNESS GAUGE SPLITTER OR RIFFLE BOX • .

 · Flakiness and Elongation Index of Coarse Aggregate. Particle shape and surface texture influence the properties of freshly mixed concrete more than the properties of hardened concrete. Roughtextured, angular, and elongated particles require more water to produce workable concrete than smooth, rounded compact aggregate.

Particle shape of coarse and allin aggregates ? Flakiness index and shape index. Shell content of coarse and allin aggregates . 6 Physical requirements. General. Resistance to fragmentation. Resistance to wear. Particle density and water absorption. Bulk density. Resistance to polishing for surface courses. Resistance to surface abrasion. .

The Flakiness And Elongation Index Test Gauges is used to estimate the applicability of coarse aggregate used in the cement and concrete mixture, it can determine the percentage of the aggregate that over than size( needle or flake). Aggregates which are flaky and/or elongated will often lower the workability of a concrete mix and may also affect long term .

 · Apparatus Required IS Sieve for Coarse Aggregate(25mm,20mm,16mm,,10mm) Weighing balance Thickness Gauge The procedure of the Test Check balance Metal gauge of Flakiness Indices. Subdivision using the sample divider or quartering method select sufficient quantity of test sample for testing. Place the test sample .

2 SUMMARY Flakiness index test is used to determine the particle shape of the aggregate and each particle shape being preferred under specific conditions the specifiion for stone for bituminous surfacing, applied to aggregate coarser than mm. It is expressed as the percentage by weight of particles (in a sample of more than 200) whose smallest dimension is .

2 SUMMARY Flakiness index test is used to determine the particle shape of the aggregate and each particle shape being preferred under specific conditions the specifiion for stone for bituminous surfacing, applied to aggregate coarser than mm. It is expressed as the percentage by weight of particles (in a sample of more than 200) whose smallest dimension is less than times the mean ...

 · Coarse aggregate is a building and construction ingredient made of stones or rocks extracted from ground deposits. Some common ground deposits include crushed stone, river gravel, rock from quarries, and even previously used concrete. It consists mainly of quarry stones, gravel, uncrushed stones, and coarse aggregates greater than five millimeters.

 · Objective For determination of flakiness index of coarse aggregate, where the size of the coarse aggregate are larger than . Reference Standards IS : 2386 (Part I) – 1963 – Method of test for aggregates for concrete (Part I) Particle size and shape. Equipment Apparatus Thickness gauge Sieves [63, 50, 40,, 25, [.]

 · The elongation index of an aggregate is the percentage by weight of particles whose greatest dimension ( length) is greater than one and fourfifths times their mean dimension. The elongation test is not applicable to sizes smaller than 6'3 mm. Procedure for Elongation Index Test. The sample size as per clause 3 of the code is taken and is sieved through IS Sieve (63, 50, 40,, 25, .

 · Relative flakiness index of recycled coarse aggregates. Full size image. The RCAs from concretes containing aggregates of angular shape (G, Q and B) have a lower flakiness index than the corresponding NCAs. Because of the presence of oriented weak planes in the natural rocks, the crushing process will lead to a larger fracture on these planes forming .

Flakiness index of coarse aggregates; Aggregate Impact Value; Los Angeles Abrasion value of aggregate; Aggregate crushing value; Bulk Density of aggregate; Stripping value of aggregate ; Sieve Analysis of Coarse Fine Aggregate (IS 2386 – Part 1) Apparatus. IS Sieve: Ranging from 25mm, 20mm, 16mm, 10mm,,,, 600.µ, 300.µ, 150 µ, Sieve .

The flakiness index of the coarse aggregate is determined as the guidelines stipulated in BS 812 part 1. Aggregate partials are classified as flaky when they have a thickness of less than of their mean sieve size. The index is calculated by separating the flaky particles and expressing their mass as a percentage of the mass of the sample tested. The test is not applicable to the .

In South Africa, the standard test method used for the determination of flakiness index of coarse aggregates is contained in TMH1 Method B3 (TMH 1 1986). In this method, a metal gauge with rectangular slots representing aggregate sieve sizes are used to obtain the masses of aggregate particles passing the slots. The flakiness index (in percent) is computed from the ratio of the mass of ...

The most common shape test is flakiness index. Coarse aggregate particles are presented to a special gauge (Figure ). If a particle's least dimension is less than 60 per cent of its mean dimension, it passes through the gauge and is classed as flaky (BSI, 1989b). Flakiness index is defined as the percentage by mass of flaky particles in ...

Elongation index and flakiness index of coarse aggregate (BS 812 Part:1) Scope: The particle is considered as elongated if its length is more than times the mean sieve size of the size fraction to which the particle belongs. Similarly, the particle is considered as flaky if its thickness is less than times the mean sieve size of the size fraction. Elongated and flaky particles have a ...

According to Indian Roads Congress, the Flakiness, Index of Coarse Aggregates used in bituminous concrete and surface dressing should NOT exceed :

 · The Flakiness index of aggregates is the percentage by weight of particles whose least dimension (thickness) is less than three fifths () of their mean dimension. This test is not applicable to sizes smaller than The Elongation index of an aggregate is the percentage by weight of particles whose greatest dimension (length) is ...