Fig. 3: Thickness Gauge- For Flakiness Index. Thickness Gauge have width equal to 0.6 times the mean dimension of the aggregate. The tolerance on dimensions shall be +/- 0.20 mm for dimensions equal to or more than 50 mm and +/- 0.10 mm for dimensions less than 50 mm. ... The Flakiness Index on an aggregate is = Total weight passing Flakiness ...
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Flakiness and Elongation Index Test are very important tests to be performed on aggregate in the laboratory. This test gives the percentage of flaky and elongate aggregate present in the total aggregate sample. Aggregate shape, size, and surface texture majorly affect the properties of freshly mixed concrete more than t…
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Flakiness and Elongation Index EXPERIMENT : Determination of the flakiness and the elongation index for the given aggregate. sample. SCOPE & SIGNIFICANCE:. This test is used to determine the particle shape of the aggregate and each particle shape being preferred under specific conditions.
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The aggregate properties are analyzed according to BS 882:1992. 2.1.1 Flakiness Index and Elongation Flakiness Index is defined as the mass of flaky particles expressed as a percentage of the mass of the sample. Elongation index is defined as the percentages by weight of particles present in it with largest dimension (length). The flakiness and
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For determination of flakiness index of coarse aggregate, where the size of the coarse aggregate are larger than 6.3mm . IS : 2386 (Part I) – 1963 – Method of test for aggregates for concrete (Part I) Particle size and shape. …
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Section 11 – Method for determination of flakiness index Section 12 – Method for determination of elongation index Section 13 – Method for determination of methylene blue value : 2. Contents. Tests for Physical and Chemical Properties . ... Flakiness index of coarse natural aggregate, ≤ 30
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(flatness) of coarse plus No. 8 aggregate. The Flakiness Index is the percentage of particles having a least dimension smaller than 60 percent of the mean size of each of one or more of the coarse sieve fractions. The lower the index for any sample of aggregate, the more nearly the aggregate particles approximate a cubical shape.
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This document summarizes research on partially replacing coarse and fine aggregate with plastic waste and bottom ash in concrete. Tests were conducted on the materials to determine their suitability. For coarse aggregate, specific gravity, sieve analysis, crushing value and flakiness index tests were performed.
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In the UK the quantity of flat or elongated particles is called flakiness. The flakiness of the aggregates can be determined using a flakiness index test as detailed in BS EN 933-3. This test is also sometimes referred to as a shape test of the aggregate, an aggregate flakiness test or aggregate elongation test. Flakiness Index Test
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Particle shape and surface texture influence the properties of freshly mixed concrete more than the properties of hardened concrete. Rough-textured, angular, and elongated particles require …
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(flatness) of coarse plus No. 8 aggregate. The Flakiness Index is the percentage of particles having a least dimension smaller than 60 percent of the mean size of each of one or more of the coarse sieve fractions. The lower the index for any sample of aggregate, the more nearly the aggregate particles approximate a cubical shape.
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What is the flakiness index test of coarse aggregates? Procedure: 1. Let us take approx. 6kg of 20mm. aggregate sample for the test procedure. 2. Set the sieves in increasing …
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Read More: Flakiness and Elongation Index Test of Coarse Aggregate | Flakiness Index | Elongation Index | Result. 5. Specific Gravity and Water Absorption Test of Coarse Aggregate . Specific gravity and Water Absorption Tests of Aggregates are major important tests to be performed on aggregate.
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AS 2758.5 outlines the test requirements for coarse aggregate for asphalt. Each aggregate property is covered in a separate section of the Standard as follows: • Section 7 covers Dimensional requirements designated as grading, shape (either by Misshapen Particle test or Flakiness Index test), and crushed particles.
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To determine the flakiness index of the given aggregates. EQUIPMENT: Sieves, balance, Flakiness Gauge, and Elongation Gauge. THEORY: Particle shape is also of prime …
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Shape tests of aggregate for highway material construction. it includes Flakiness Index,Elongation Index and Angularity Number. ... The soundness test involves immersing coarse aggregate samples in a sodium sulfate solution for 24 hours, then drying and cooling them in cycles over 10 days. The percentage loss is calculated by comparing the ...
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Coarse aggregate constitutes the biggest part of concrete. It is desirable that aggregates are of desired properties. Two shape tests namely Elongation Index Test and Flakiness Index Test are used for selection of proper aggregates. ... Flakiness Index It is the percentage by weight of particles in it whose least dimension is less than three ...
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Aggregates are considered the main components of asphalt mixtures in terms of weight, volume, and flexibility of pavements. Countries are looking for alternative materials for use in pavements as ...
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IS: - 2386 (Part - I) 2016 Method of test for aggregates for Concrete – Particle Size and Shape (Coarse aggregates) The flakiness index of an aggregate is the percentage by weight of particles in it whose least …
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Flakiness Index of aggregate is the percentage by weight of aggregate particles whose least dimension is less than 0.6 of their mean dimensions. This test is applicable to aggregates having size larger than 6.3mm.
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For determination of flakiness index of coarse aggregate, where the size of the coarse aggregate are larger than 6.3mm . 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, 31.5, 25, 20, 16, 12.5, 10 & 6.3mm]
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other aggregate particles. When the coarse aggregate does fracture, the gradation will likely change which may be detrimental to the mix. Additionally, flat and elongated particles of aggregate, for some construction uses, may interfere with consolidation and may result in harsh, difficult to place mixtures.
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aggregate particles. The flakiness index can be obtained from the shape/volume parameters (length, width and thickness) of the aggregates. The use of flaky aggregate ... 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
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STANDARD IS: 2386 (Part 1)1963. DEFINITION The Flakiness Index of aggregates is the percentage by weight of particles whose least dimension (thickness) is less than 0.6 times their mean dimension. The Elongation Index of aggregates is the percentage by weight of particles whose greatest dimension (length) is greater than 1.8 times their mean dimension. …
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Shape test on coarse aggregate – Flakiness index test. The particle shape of aggregates is determined by the percentages of flaky and elongated particles contained in it. for concrete and construction of bituminous works the presence of flaky and elongated particles are not suitable and cause failures and breaking during heavy loads.
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Record of Shape Test. The given context includes two equations that calculate different indices based on certain variables. The Flakiness Index is calculated by adding up all the values of X (X1, X2, etc.) and dividing it by the sum of all the values of W (W1, W2, etc.), and then multiplying the result by 100.
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D. Calculating & Reporting (Flakiness Index): The Flakiness Index shall be reported to the nearest whole number. The sieve analysis obtained in this test shall also be reported. Flakiness Index = M 3 x 100 M 2 (Continued on back.) Flakiness Index & Elongation Index HM-925 OPERATING MANUAL Rev: 07/2019
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Aggregate may be natural, manufactured or recycled. natural aggregate-aggregate from mineral sources which has been subjected to nothing more than mechanical processing. manufactured aggregate-aggregate of mineral origin resulting from an industrial process involving thermal or other modification. recycled aggregate-aggregate resulting from the ...
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Shape tests on coarse aggregates such as flakiness index and elongation Index, its importance in concrete construction, methods of determination is discussed. ... The Elongation index of an aggregate is the percentage by weight of particles …
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Here I have explained about the flakiness and elongation index test of coarse aggregate. Read definition, apparatus, IS code, procedure, observations, formula, result, lab report about flakiness and elongation index …
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4.2 Flakiness index When determined in accordance with BS 812-105.1, the flakiness index of the combined coarse aggregate shall not exceed 50 for uncrushed gravel and 40 for crushed rock or crushed gravel. NOTE 1 For special circumstances, e.g. for pavement wearing surfaces, a lower flakiness index may be specified.
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The scope of this test is to provide test methods for determining the flakiness index of coarse aggregate. An aggregate is classified as being flaky if it has a thickness (smallest dimension) of less than 0.6 of its mean sieve size. The flakiness index of an aggregate sample is found by separating the flaky particles and expressing their mass
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a coarse aggregate is naturally made up of rounded particles and ... specifies that the maximum allowable flakiness index is approximately 25 to 30% depending on the type of road layers and also the type of aggregate gradations used in the road construction [7, 8]. For an asphalt mixture used for wearing
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This document outlines a procedure to determine the flakiness index and elongation index of coarse aggregates through laboratory testing. The test involves sieving aggregates into different size fractions and measuring at least 200 pieces from each fraction to determine the percentage that are flaky, having a thickness less than 0.6 times the mean dimension, or elongated, …
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What Is Coarse Aggregate? Coarse aggregate is a term used in construction to describe a type of material that is commonly used in the production of concrete. It is typically made up of various materials such as gravel, crushed stone, and recycled concrete. The size of the coarse aggregate can vary, but it is typically between 3/8 inch and 1.5 ...
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Aggregate Classification Devices - Humboldt Mfg. Aggregate Classification Devices. ... in coarse aggregates . H-1684 Flakiness Gauge for Classification of Aggregate.
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The scope of this test is to provide test methods for determining the flakiness index of coarse aggregate. An aggregate is classified as being flaky if it has a thickness (smallest dimension) …
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