2. A flaky particle is one whose least dimension (i.e., its thickness) is less than 0.6 times the mean size of the particle. Elongation Index = (Xg / Wg) x 100% You must log in or register to reply here. All parts of equipment should be kept clean. 1 Set the gauge length. seperating the elongation particles and expressing their mass as a percentage of the mass of sample tested.From the experimen, the mean elongation index is 26.0 (sieve 28mm) and elongation index is 22.4%.So we get 1.16 < 1.8.We can classify the sample as not an elongation sample. As an estimate, the particle length is greater than 1.8 times the mean particle size. Raft Foundation - Types, Uses, Functions, Advantages and Disadvantages, Flow Table Test - Procedure, Calculation, Apparatus and Advantages, Hydrophobic Cement - Uses, Properties, Manufacturing, Advantages and Disadvantages, Different Types of Steel in Construction - Properties & Characteristics, 10 Different Types of Forklift Trucks - Features, Uses and Safety Checklist. The elongation index is the total weight of the material retained on the various . 5. So, to avoid the above-mentioned situation, the particles have to be tested for their elongation indices values to check their suitability for using in road constructions. The EF1Alpha (eEF1A), a component of EF1 is GTP- dependent and its function is to accurately attach aminoacyl-tRNA to the ribosome. Sieve the material through 12.5mm and 10.0 mm IS sieves. CALCULATIONS Fig 1 : Shape of Elongated Aggregate Particles. Cumulate the individual elongation indices of the groups to find the elongation index of the aggregate sample. Total weight of the fraction, W=, Therefore, Elongation Index = [w/W]x 100% =. How do structural engineers assist in designing buildings that can withstand earthquakes? Example:- (6.3mm size sieve in bottom and 63mm size sieve in top). 4. 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. 1. The angularity of these particles proves advantageous for particle inter-locking, making their use the best choice for a granular base coarse construction, conferring stability to the pavement. The table top is cleaned of all gritty material and is wetted. In order to separate the flaky materials, the aggregates which pass through appropriate elongated slot of the thickness of gauge are found. DOCX, PDF, TXT or read online from Scribd, 60% found this document useful, Mark this document as useful, 40% found this document not useful, Mark this document as not useful, retained on the spe!i$ed set of siees is noted" Ea!h pie!e of these are, tried to be passed thro#gh spe!i$ed length of the ga#ge length %ith its, longest side and those elongated pie!es %hi!h do not pass the ga#ge are, separated and then the elongated index is the total %eight of the material, retained on the ario#s length ga#ges, expressed as a per!entage of the, )etal Ga#ge* The metal ga#ge shall be of the pattern sho%n in +ig"', Siees* IS Siees of sies -. 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. The particles which are not passed or retained on the length gauge are weighed which is W2. 2.6 Tensile index, the tensile strength in N/m divided by grammage. COURTESY: AIMIL LTD, Fig 2: Diagram of Elongation Index Gauge Elongation index or Elongated aggregate is the particle whose largest dimension is more than 1.8 or 9/5 times of their mean dimension. Elongation value is 0% because the aggregate is rounded so no any retain value. Hence the workability will be more. Specs: Aggregates is innocuous if expansion < 0.10% at 16 days; The Elongated index is calculated by expressing the weight of Elongated particles as percentage of total weight of the sample. The elongation index is found by separating the elongation particles and expressing their mess as a percentage of the mass of sample tested. Procedure For Elongation Index Test of Aggregate :- Sieve the aggregate sample with sieves specified in the given Table. If the texture of the aggregate is smooth then the surface area of that aggregate is decreased hence workability will be reduced. Enter your E-mail address to subscribe. In Elongation index, we generally check for the length of aggregate which is suitable for any construction giving proper workability, durability, and desirable strength. Generally, characteristic strenth of burned clay brick is in the range of 5N/mm 2 - 10N/mm 2. Elongation index test of an aggregate is the percentage by weight of particles whose greatest dimensions is greater than 1.8 times their mean dimensions. 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. The given sample of aggregates which are to be tested are passed through a set of sieves and they are separated into specified range of sizes. Cumulate the percentage values to determine the flakiness index of the entire aggregate sample. 8.0 Conclusions The value that we get from this test is 15.1% for flakiness and not exceeds 20% the JKR requirement. ASTM D5278 - 09 Standard Test Method for Elongation of Narrow Elastic Fabrics (Static-Load Testing) JLW Instruments 14 North Peoria St . Now fill the aggregate in the mould along with the plunger on top. Superpave mix design specifies a ratio of 5:1 and tests particles for flatness and elongation. Cumulate the individual elongation indices of the groups to find the elongation index of the aggregate sample. The test sample: normally aggregates sized 10.0 mm to 12.5 mm. To keep accuracy and eliminate testing bias, the particle should be passed multiple times with different facings. Method of aggregate cooling using water spray ? The flakiness index of aggregates is the percentages by weight of particles whose least dimension (thickness) is less than 3/5 th (0.6) of their mean dimension. 2. From each of the range of size, the aggregates are then individually passed through the appropriate gauge of the length gauge with the longest side in order to separate the elongated particles. Please briefly explain why you feel this answer should be reported. If the shape of the aggregate is round, in that case, the surface area of the aggregate is less, and the workability of that aggregate is more. 1. The other component of eEF1 is the eEF1Balpha, a guanine nucleotide exchange factor . 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. for fabrics with elongation >75% at maximum force, the gauge length is (1001)mm. A separate sample retains on this slot and weighted it (W2). Country A minimum of 200 pieces of any fraction are taken to be tested, and weighed properly by weighing balance. The elongation index is the total weight of the material retained on the various length gauges, expressed as a percentage of the total weight of the sample gauged. Aggregates for Concrete cedd gov hk. The portion of elongated aggregate which have length greater than the specified gauge from each range is weighed by weighing balance. Log in to TheConstructor to ask questions, answer peoples questions, write articles & connect with other people. The sample gradation curve can also be plotted using the sieve analysis data and the conformance of the samples gradation with the limiting gradation curves provided by the standard can also be assessed. Elongation is a measure of deformation that occurs before a material eventually breaks when subjected to a tensile load. Then the elongation index is calculated as the total weight of material retained on various length gauges, expressed as a percentage of the total weight of sample gauged. Note: Test can be conducted for each range of elongation gauge slot. Is water jet method of building demolition is suitable? Sieve the sample through mentioned sieves i.e., from 63mm to 6.3mm sieves. 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 elements added in the alloy of ASTM A36 Pipe include manganese, carbon, phosphorus, silicon, sulfur, and copper.Along with a heat analysis, the ASTM A36 Seamless Pipe is evaluated using the tension test.Several parameters including the products tensile and yield strength besides its elongation properties are checked.ASTM A27 includes carbon steel castings for applications requiring up to . Given sample of aggregates to be tested is sieved through a set of sieves and separated into specified ranges of size. Aggregate Sample. The (three) 3-point bend test is conducted on flexural members of the structure such as the beam. After that, just we need to perform a sieve analysis test and shake all arranged sieves with help of a vibrating shaker and manually. Nevertheless, a sample comprising flaky particles in a percentage greater than 30% is not qualified for the intended use. Hence workability will be more. Example:- (6.3mm size sieve in bottom and 63mm size sieve in top) It is the increase in the gauge-length of a test specimen after fracture divided by its original gauge-length. Flakiness Elongation Index Test Procedure For Aggregate Author: admission.sust.edu-2022-08-22-02-18-31 Subject: Flakiness Elongation Index Test Procedure For Aggregate Keywords: flakiness,elongation,index,test,procedure,for,aggregate Created Date: 8/22/2022 2:18:31 AM 6. For cement concrete structure, if used aggregate elongation index percent is more than its permissible limit then it is undesirable for any type of construction work. 3. 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. The aggregate particles from each of the size range is taken and passed through corresponding gauge of length gauge or elongation gauge with its longest side. Although there are exceptions, percent elongation . 7 Elongation index of Aggregate 8 Flakiness index of aggregate 9 Impact test . Table: 1 Elongation Index: It represents the weight of elongated particles as a percentage of the total samples weight. its mean dimension then such type of aggregate known as elongated aggregate and elongated index is calculated by the percentage of the total weight which is retained on elongated or length gauge to the total weight of aggregate used for the sample. Which is the code used for the design of the RCC Bridge? COURTESY: SLIDESHARE, Fig 3: Set of IS Sieves Hence, the strength and durability of aggregate are affected. It tells me about the aggregate whose larger dimension is more than 1.8 times of their mean dimension. ASTM 4791-10: Standard Test Method for Flat Particles, Elongated Particles or Flat Elongated Particles in Coarse Aggregates, American Society for Testing and Materials. . Test sieves of sizes - 63mm, 50mm, 40mm, 31.5mm, 25mm, 20mm, 16mm, 10mm and 6.3mm. 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. The Elongation index of an aggregate is the percentage by weight of particles whose greatest dimension (length) is greater than nine-fifths (1.8times) their mean dimension. Determine the individual flakiness index of each huddle by dividing the weight of flaky particles in each group to the total weight of aggregates in the corresponding group. The test is not applicable to material passing 6.30 mm sieve or retained on 50 mm sieve. This test is performed on coarse aggregates and is intended to determine the shape of aggregates i.e., rounded, angular, flaky, or elongated. Thanks, Your email address will not be published. The support may be either roller or hinged. You will receive a link and will create a new password via email. Typical Definition. Elongation Gauge (Length Gauge) 3. In addition, the percentage of flaky or elongated particles in an aggregate sample can be determined and discarded. COURTESY: AIC- LAB EQUIPMENTS. Each of these pieces is then tried to pass through specified gauge length with its longest side and these elongated particles which do not pass through the specified gauge are separated. This test does not apply to sizes smaller than 6.3mm.The Elongation index of an aggregate is the percentage by weight of particles whose greatest dimension (length) is greater than nine-fifths (1.8times) their mean dimension. Sorry, you do not have permission to ask a question, You must log in to ask a question. Now calculate the elongation index which is the ratio of weight of particle retained on length gauge to the total weight of the sample gauged and it is expressed in percentage. ContentsIntroduction:Related theory:Standards:Apparatus:Procedure:For materials softening below 80:For materials softening above 80:Observations:Comments:Precautions: Introduction: Bitumen is defined as a binding material, ContentsStandard FollowedObjectiveRelated TheoryAbrasion:Pounding Action:Los Angeles Abrasion Value (LAAV)Significance of LAAVApparatusTest ProcedureObservations and CalculationsStandard Recommendations:ResultsTest PrecautionsDiscussion Standard Followed ASTM, ContentsIntroduction:Related theory:Standard:Apparatus:Procedure:Observations:Calculations:Comments:Precautions: Introduction: The application of load on the aggregates such as pavements result into the disintegration of, Flakiness And Elongation Index Index Test, Significance of determination of flakiness and elongation index, How To Increase Your Profit By Becoming A Carrier, How to hire a qualified fence installer you can trust in San Antonio, Texas, Elevating Your Property With Awesome Landscaping Design, coarse aggregates and is intended to determine, The degree of packing or inter-locking of an, Flaky and elongated particles tend to lower the workability of, These particles are inherently friable when subjected to heavy loading.
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