Now, the aggregate is selected on each size of sieves in a specific number and passed the aggregate (lengthwise) through the different sizes sets of a gap on elongation or length gauge. Elongation Index = (Xg / Wg) x 100% You must log in or register to reply here. How to calculate cement sand and aggregate quantity in concrete? 2 Rate of extension or elongation Abrasion Test on Aggregate (Los Angeles Test) Test Procedure for Elongation Index The Following is the procedure for elongation index, Separation of Elongation Material Elongation Test Try to pass the aggregate length wise through slot of 10mm to 6.3 mm on length gauge. Brick is the most widely used construction material for walls. After the end of test, sieve should be cleaned by smooth brush. 4. Hence workability will be more. You will receive a link and will create a new password via email. Page | 4 APPARATUS 1. And for mixed aggregate(having flaking and elongated aggregate) then its permissible limit is 30%. Testing can be done is the same machined used to test the concrete cube strength. 7 LAB TESTS ON . A flaky particle is one whose least dimension (i.e., its thickness) is less than 0.6 times the mean size of the particle. First, fill the sample aggregate with one-third of the cylindrical measure in three layers. If the index values are less than the limiting values specified by the standard, the sample marked qualified for the intended use. 5. [For example, the mean sieve size for an aggregate piece passing through 50 mm and retained on 40 mm sieve is (50+40)/2 i.e. In an ASTM test of tensile strength, the test specimen is pulled from both the ends. 3. Mechanical Tests for Bituminous Mixes - Characterization, Design and Quality Control E. The aggregate which is retained on the elongation gauge or not passed through the elongation gauge should be taken for weight w2. Elongation index or Elongated aggregate is the particle whose largest dimension is more than 1.8 or 9/5 times of their mean dimension. Procedures. The weight which is obtained from above is then divided by the total weight of the sample taken from different size ranges and the ratio is expressed as percentage which is the required elongation index. This test is not applicable for the aggregate size of less than 6.3 mm. COURTESY: SLIDESHARE, Fig 3: Set of IS Sieves Take the aggregate sample which contains minimum 200 pieces of any fraction. 2. In other words, the Total weight of aggregate retained on the elongation gauge is divided by the total weight of the aggregate sample and then multiplied by 100. Quantitatively, a maximum limit of 30% flaky particles is imposed by the standard and is regarded as acceptable. The flakiness and elongation rocks are not suitable for road . Generally, characteristic strenth of burned clay brick is in the range of 5N/mm 2 - 10N/mm 2. If the texture of the aggregate is rough, then the surface area of that aggregate is more. If the samples gradation curve lies between the limiting curves plotted against the specified values given in the table, the sample is well-graded. All parts of equipment should be kept clean. Hence the workability will be more. Procedure of performing Elongation Index Test Firstly, take 1000 grams of aggregate sample and weigh it w1. If the texture of the aggregate is smooth then the surface area of that aggregate is decreased hence workability will be reduced. Lost your password? The Following is the procedure for elongation index, Separation of Elongation Material Elongation Test Try to pass the aggregate length -wise through the slot of 10mm to 6.3 mm on the length gauge. mm, '& mm. However, the grading requirements of aggregates to be used in the base course and sub-base course are separately defined, considering the amount of load each course has to bear. Sieve the material through 12.5mm and 10.0 mm IS sieves. Hence, the strength and durability of aggregate are affected. Flakiness Elongation Index Test Procedure For Aggregate on flakiness gauge punjab state road sector project pwd b amp r branch govt of punjab punjab roads amp bridges . It is measured on particles passing through mesh size of 63mm and retained on mesh size of 6.3mm. It is the increase in the gauge-length of a test specimen after fracture divided by its original gauge-length. Flow table test apparatus PROCEDURE: 1. Table: 1 The portion of elongated aggregate which have length greater than the specified gauge from each range is weighed by weighing balance. 2. If the samples distribution curve lies outside the extremities defined by the standard, it is said to be poorly graded. This means that the results can easily be amended if we get rid of flaky particles in the determined range. Expertcivil is the world's leading learning platform for civil & architectural engineers. Now fill the aggregate in the mould along with the plunger on top. The particles which are not passed or retained on the length gauge are weighed which is W2. Sieve the aggregate sample into groups of closely limited particle sizes, e.g. 7 Elongation index of Aggregate 8 Flakiness index of aggregate 9 Impact test . If the aggregate is poorly graded or uniformly graded, then the voids are maximum in that type of aggregate workability will be less. 45 mm. The aggregate retained on 63mm and passed through 6.3mm should not be considered. Procedure 1. If particle retained on 10mm and passed through 16mm size is taken, then it should pass through 23.4mm length gauge which is 1.8 times the mean of 10mm and 16mm. Given sample of aggregates to be tested is sieved through a set of sieves and separated into specified ranges of size. And United Testing Systems offer advanced universal test machines (UTM's) and hardness testers to give you the answers you need. Each fraction is gauged in turn for thickness on the metal gauge. No views Oct 22, 2022 This video demonstrates a flakiness and elongation index test procedure to determine the flakiness and elongation indices of the given aggregat .more .more. Similar threads Fly-ash or Pozzolanic Material Test - Loss on Ignition Narendra Oct 4, 2020 Replies 0 Views This test is also applicable to aggregates having size larger than 6.3 mm. 4. For road construction especially in surface course the elongated shape of aggregates is not desirable. What must be the maximum dry density of Granular Sub Base & Wet Mix Macadam used What is the Safe Bearing Capacity values for Different Soils? The dimensional ratio at which an aggregate particle is considered too flat or too elongated can vary from specification to specification. 2. It's a business model that works as well now as it did 50 years ago, back when our early table-top hydraulic testers were gaining popularity. These particles are a source of frailty for an aggregate mix and therefore, they must be identified and discarded. Want a better understanding of how elongation testing might fit into your process? for fabrics with elongation >75% at maximum force, the gauge length is (1001)mm. The test sample: normally aggregates sized 10.0 mm to 12.5 mm. The sample shall be sieved with the sieves specified in Table 1: . Res/sir, Sorry, you do not have permission to add a post. CALCULATIONS 4. Lost your password? A separate sample retains on this slot and weighted it (W2). then the type of aggregate results reduction in surface area of aggregate and an increment in workability. After the particles have been classified into the two groups, determine the The aggregate quantity taken for the test should be ample so that for each sieved huddle, enough aggregate quantity is available for the test. ASTM D5278 - 09 Standard Test Method for Elongation of Narrow Elastic Fabrics (Static-Load Testing) JLW Instruments 14 North Peoria St . These particles are preferred for the construction of rigid pavements. Ask & get answers from experts & other users. The elongation index just tells us if the aggregate having a larger dimension is more than 1.8 times. Weigh the elongated material passing through the specified gauge from each fraction E1+E2+E3+E4+E5+.= E. CALCULATIONS Elongation Index, (%) = (E / F) x 100. Understanding the essence of your metal, wood, and plastic samples is key. The (three) 3-point bend test is conducted on flexural members of the structure such as the beam. 2- The weight of the sample (W total) for each test shall be not less than that in the table below: Aggregate size (mm) Sample weight (kg) Distance between the Passing from Retained on bars of elongation scale 63 50 50 50 37.5 40 78 mm 37.5 28 15 59 28 20 5 43 2009-2021 The Constructor. Calculation for Elongated Particles: PRECAUTIONS: While sieving, care must be taken that the particles that are chocked in the sieve must no be forced down into the next sieve. The aggregates crushing value test should be performed as per IS code 2386 Part IV. PROCEDURE Note: Test can be conducted for each range of elongation gauge slot. Free Download eBooks, Notes, Templates, etc. Minimum 200 pieces of any fraction are taken and weighed properly. A weighing balance having an accuracy in measuring of 0.1% of the weight of sample. When you join you get additional benefits. To begin the tensile stress test, slowly separate the tensile clamps at a constant speed. As the latter is applied, an increase in length and a uniform reduction in cross-sectional area take place, while the material maintains a constant volume. COURTESY: AIMIL LTD, Fig 2: Diagram of Elongation Index Gauge The support may be either roller or hinged. Cumulate the individual elongation indices of the groups to find the elongation index of the aggregate sample. Elongation Index= [W 2 / W 1] x 100 Where W 2 = Weight of aggregates passing through 1.8 x d mean size W 1 = Total weight of aggregates Other agencies have used different . Percent Elongation = 100 x ( (Final Length - Original Length) x Original Length) Percent elongation is incredibly useful to determine the ductility of a material. 3. Elongation index is more than 15% then the aggregate is undesirable for any construction work. In this attempt, make sure the particles are not compelled to pass a particular opening of the thickness gauge. A beam is a flexural member that is subjected to bending on the application of load. If the aggregate is well graded, then the voids are minimum. The mould is kept on the centre of the table, firmly held and is filed in to layers. #flakinessindex#elongationindexlearn calculation of combined flakiness index and elongation index value also visit our website www.civilblogon.blogspot.comFL. NOTE 1: . Elongation Index Test on Coarse Aggreagtes, Advantage of Continuous over Simply Supported Multi-Span Deck. percent of the weight of the test sample. RELEVANT CODES: ASTM 4791-10: Standard Test Method for Flat Particles, Elongated Particles or Flat and Elongated Particles in Coarse Aggregate, American Society for Testing and Materials IS 2386 (Part I)-1963 Methods of Test for aggregates for Concrete; Particle size and shape; Bureau of Indian Standards PROCEDURE: 1. AIM OF THE EXPERIMENT: Apparatus required for elongation index determination tests are: 1. CODE OF REFERENCE: The other component of eEF1 is the eEF1Balpha, a guanine nucleotide exchange factor . Each layer is rodded 25 times with a tamping rod 1.6 cm in diameter and 61 cm Aggregate quality for road construction will also influence the road performance. 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Page | 4 APPARATUS 1. Take the aggregate sample which contains minimum 200 pieces of any fraction. After shaking, aggregate should be distributed on different sizes of sieves (in systematic arranges order) and weigh all the sieves one by one on which aggregate is retained. Firstly, take 1000 grams of aggregate sample and weigh it w1. The flakiness & elongation index test is connected as thickness gauge and length gauge respectively. 3. 8. Determine the individual elongation index of each huddle by dividing the weight of elongated particles in each group to the total weight in the corresponding group. 2.5-2 in., 0.5-0.375 in., etc. The tensile test method covers the measurement of load elongation characteristics and includes procedures for the calculation of secant stiffness, maximum load per unit width and strain at maximum load. Cumulate the percentage values to determine the flakiness index of the entire aggregate sample. However, practically, an aggregate sample cannot be devoid of such particles. Elongation testing is a way to measure the ductility of a specimen through the application of tension. Select a countryland IslandsAfghanistanAlbaniaAlgeriaAndorraAngolaAnguillaAntarcticaAntigua and BarbudaArgentinaArmeniaArubaAustraliaAustriaAzerbaijanBahamasBahrainBangladeshBarbadosBelarusBelauBelgiumBelizeBeninBermudaBhutanBoliviaBonaire, Saint Eustatius and SabaBosnia and HerzegovinaBotswanaBouvet IslandBrazilBritish Indian Ocean TerritoryBritish Virgin IslandsBruneiBulgariaBurkina FasoBurundiCambodiaCameroonCanadaCape VerdeCayman IslandsCentral African RepublicChadChileChinaChristmas IslandCocos (Keeling) IslandsColombiaComorosCongo (Brazzaville)Congo (Kinshasa)Cook IslandsCosta RicaCroatiaCubaCuraaoCyprusCzech RepublicDenmarkDjiboutiDominicaDominican RepublicEcuadorEgyptEl SalvadorEquatorial GuineaEritreaEstoniaEthiopiaFalkland IslandsFaroe IslandsFijiFinlandFranceFrench GuianaFrench PolynesiaFrench Southern TerritoriesGabonGambiaGeorgiaGermanyGhanaGibraltarGreeceGreenlandGrenadaGuadeloupeGuatemalaGuernseyGuineaGuinea-BissauGuyanaHaitiHeard Island and McDonald IslandsHondurasHong KongHungaryIcelandIndiaIndonesiaIranIraqIsle of ManIsraelItalyIvory CoastJamaicaJapanJerseyJordanKazakhstanKenyaKiribatiKuwaitKyrgyzstanLaosLatviaLebanonLesothoLiberiaLibyaLiechtensteinLithuaniaLuxembourgMacao S.A.R., ChinaMacedoniaMadagascarMalawiMalaysiaMaldivesMaliMaltaMarshall IslandsMartiniqueMauritaniaMauritiusMayotteMexicoMicronesiaMoldovaMonacoMongoliaMontenegroMontserratMoroccoMozambiqueMyanmarNamibiaNauruNepalNetherlandsNetherlands AntillesNew CaledoniaNew ZealandNicaraguaNigerNigeriaNiueNorfolk IslandNorth KoreaNorwayOmanPakistanPalestinian TerritoryPanamaPapua New GuineaParaguayPeruPhilippinesPitcairnPolandPortugalQatarRepublic of IrelandReunionRomaniaRussiaRwandaSo Tom and PrncipeSaint BarthlemySaint HelenaSaint Kitts and NevisSaint LuciaSaint Martin (Dutch part)Saint Martin (French part)Saint Pierre and MiquelonSaint Vincent and the GrenadinesSan MarinoSaudi ArabiaSenegalSerbiaSeychellesSierra LeoneSingaporeSlovakiaSloveniaSolomon IslandsSomaliaSouth AfricaSouth Georgia/Sandwich IslandsSouth KoreaSouth SudanSpainSri LankaSudanSurinameSvalbard and Jan MayenSwazilandSwedenSwitzerlandSyriaTaiwanTajikistanTanzaniaThailandTimor-LesteTogoTokelauTongaTrinidad and TobagoTunisiaTurkeyTurkmenistanTurks and Caicos IslandsTuvaluUgandaUkraineUnited Arab EmiratesUnited Kingdom (UK)United States (US)UruguayUzbekistanVanuatuVaticanVenezuelaVietnamWallis and FutunaWestern SaharaWestern SamoaYemenZambiaZimbabwe, By registering, you agree to the Terms of Service .*.
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