For crushed aggregate, the particle shape and surface texture depend on the nature of the parent material and on the type of crusher and its reduction ratio. The flakiness index is the weight of flaky particles as a % of the sample weight. Elongation index is defined similarly.
Dec 12, 2017· 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. Rough-textured, angular, and elongated particles require more water to produce workable concrete than smooth, rounded compact aggregate.
FLAT PARTICLES, ELONGATED PARTICLES, OR FLAT AND ELONGATED PARTICLES IN COARSE AGGREGATE ASTM D 4791 GLOSSARY Flat and Elongated Particles of Aggregate - Those particles having a ratio of length to thickness greater than a specified value. Length - the maximum dimension. Thickness - the maximum dimension perpendicular to the length and width.
D4791-10 Standard Test Method for Flat Particles, Elongated Particles, or Flat and Elongated Particles in Coarse Aggregate (Withdrawn 2019) Products and Services / Standards & Publications / Standards Products. You are being redirected because this document is …
This method is based on the classification of aggregate particles as flaky when they have a thickness (smallest dimension) of less than 0.6 of their nominal size, this size being taken as the mean of the limiting sieve apertures used for determining the size fraction in which the particle occurs. The flakiness Index of
LASER-BASED APPROACH FOR DETERMINING FLAKINESS INDEX OF AGGREGATES USED IN PAVEMENTS ... aggregate particles. The flakiness index can be obtained from the shape/volume parameters (length, width and thickness) of the aggregates. ... the standard test method used for the determination of flakiness index of coarse aggregates is contained in TMH1 ...
Flakiness and Elongation Flakiness Index Sieve Set UTA-0410. When an aggregate particle has a thickness less than 0.6m of its mean sieve size, it is considered flaky. The aggregate to be classified is separated into seven sieve fractions from 6.3 to 63 mm and each fraction is examined separately.
FLAKINESS INDEX Aim: - Determine the flakiness index of coarse aggregate supplied to you. Practical Relevance: - An aggregate having least dimensions of 0.6 times the mean sieve sizes are called flaky particles . Mean sieve size is the average sieve size to which the particle pass and the sieve size on which particles are retained.
ELONGATION INDEX = (wt of aggregate retained on specified gauge) / (total wt of aggregate taken) Flakiness index is the % by weight of particles whose least dimension is lesser than 3/5 of the mean dimension ... what do u mean by elongation & flakiness of aggregate?.. Answer / feroz.
The flakiness of aggregate is determined by measuring the thickness of individual particles. Hence we offer thickness gauge and length gauge to check flakiness and elongation index of the aggregate respectively. ... Used for Determination of flakiness index of coarse aggregates. It consists of a steel frame with a sliding panel having slots of ...
Tags: AGGREGATE FLAKINESS INDEX VALUE, astm standard for flakiness index, Definition of Flakiness index, Determination of elongation index, Elongation Index Test on Coarse Aggreagtes, enlist the factors affecting the flakiness index of an aggregate, explain the use of elongation index in case of concrete road works, flakiness and elongation ...
Mar 03, 2012· Flakiness and Elongation Test (BS 812: Part 3) ... As such the flakiness and elongation test must be carried out to determine the suitability of the material. 2.0 Objective. To determine the flakiness index of aggregates. ... Flakiness index (%) = Nos. passing
Flakiness Index is the percentage by weight of particles in it, whose least dimension (i.e. thickness) is less than three-fifths of its mean dimension. Elongation Index is the percentage by weight of particles in it, whose largest dimension (i.e. length) is greater than one and four-fifths times its mean dimension.
The Flakiness Index of a coarse aggregate is the mass of particles in that aggregate, expressed as a percentage of the total mass of that aggregate, which will pass the slot or slots of specified width for the appropriate size fraction, as given in Table I below.
Sep 05, 2018· In this video, i had given full detail practical procedure of determining flakiness and elongation index of coarse aggregate.
For determining flakiness index. Particle is flaky when its thickness (smallest dimension) is less than 0.6 of the mid-size of the sieve fraction. Gauge has seven, labeled slots for manual evaluation of particles in the seven openings. The mass of all flaky particles (passing appropriate slots) as percent of the sample is the flakiness index.
Definition of Flakiness index and Elongation index. April 7, 2013 by admin 2 Comments. ... Flakiness index. ... According to BS specifications flakiness index of the aggregate used for the road construction should not be greater than 35 % and Elongation index should not be greater than 45 %.
Flakiness Index and Elongation Index Test on Coarse Aggregates Shape tests on coarse aggregates such as flakiness index and elongation Index, its importance in concrete construction, methods of determination is discussed.
Dec 06, 2016· SHAPES OF PARTICLES In addition to the aggregate grading, the particle shape is of importancefla. ... Flakiness and Elongation of aggregates and Concrete properties ... Flakiness …
For determination of flakiness index of coarse aggregate, where the size of the coarse aggregate are larger than 6.3mm . ... The total amount of flaky material retained by the thickness gauge is weighed ... permissible limit of FI. More details » Get Price.
Flakiness & Elongation of Aggregate Determinations for the flakiness index and flakiness and elongation of aggregate use a British Standard classification system consisting of a Thickness Gauge for determining flakiness index and a metal Length Gauge for determining elongation index.
METHOD FOR DETERMINING AGGREGATE FLAKINESS INDEX 933.01 Objectives The Flakiness Index of an aggregate is determined using a gauge with slots of appropriate dimensions. Individual size fractions are separated and each particle that passes through the ... Sample Size conforming to AASHTO T 27 Sieve Analysis of Fine and Coarse Aggregate.
Dec 25, 2018· Flakiness test is conducted on coarse aggregates to assess the shape of aggregates. Aggregates which are flaky are detrimental to the higher workability and stability of mixes. ... Definition of Flakiness index, enlist the factors affecting the flakiness index of an aggregate, explain the use of elongation index in case of concrete road works ...
Flakiness index and Elongation Index of Coarse Aggregates AIM: i. ... conclusion of aggregate shape test (flakiness index and elongation index ) for highway construction, flakiness lab procedure, aggregate shape test, flakiness and elongation index test results, flakiness index, elongation index, average least dimension, flakiness and ...
DETERMINING FLAKINESS INDEX TxDOT Designation: Tex-224-F Effective Date: August 2016 1. SCOPE 1.1 Use this test method to determine the percentage of particles in a coarse aggregate material that have a thickness (smallest dimension) of less than one-half of the nominal size.
1.1 This test method covers the determination of the particle index of aggregate as an overall measure of particle shape and texture characteristics. ... C136 Test Method for Sieve Analysis of Fine and Coarse Aggregates. ... Standard Test Method for Index of Aggregate Particle Shape and Texture, ASTM International, West Conshohocken, ...
Flakiness Gauge for Classification of Aggregate Particles— H-1684 For determining flakiness index. Particle is flaky when its thickness (smallest dimension) is …
Flakiness & Elongation of Aggregate Void Content measures the angularity, sphericity, and surface texture of fine and coarse aggregates. Proportional Calipers are efficient devices that quickly determine percentages of elongated and flat particles in coarse aggregate fractions.
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 0.6 times their mean area.
Elongation Index: 538 / 2639 x 100 = 20.39% 5.0 Reporting of result: the elongation index is the total weight of the material return on the varies length gauge expressed as a percentage of total weight of the sample gauge. DETERMINATION OF FLAKINESS INDEX : 1.0 Apparatus : 1.1 Balance : Balance used 0.1 % Capacity of test sample weight
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weight of coarse aggregate is undesirable. The test is carried on aggregate sizes between 63 mm and 6.3 mm. Apparatus: 1- A balance of accuracy of 0.1% of the sample weight. 2- A set of sieves. 3- A special scale for elongation index. 4- A special scale for flakiness index.
This British Standard, a section of the BS 812 series, describes methods for determining the flakiness index of coarse aggregate. Aggregate particles are classified as flaky when they have a thickness of less than 0.6 of their mean sieve size.