2. Test each of the particles in each size fraction and place them into one of two groups: (1) Particles with longest to thinnest ratios over 5:1 and (2) Particles with . Take the weight of the total aggregate sample collected for tests as W1. Flakiness index and elongation index are two important types of indices useful in determining the concentration of a given sample by means of the particles that are present in the sample. of the sheet used in the gauge or sieve shall be as. 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 1.8 times the mean sieve size of the size fraction to which the particle belongs. Save my name, email, and website in this browser for the next time I comment. Aggregate Sampling Equipment will sometimes glitch and take you a long time to try different solutions. Flakiness and Elongation Index Test are very important tests to be performed on aggregate in the laboratory. A high flakiness index test result indicates a high proportion of elongated aggregates, a low test result indicates a low proportion of elongated aggregates. BS-1241 specifies a Flakiness index not exceeding 30% irrespective of the aggregate size. For base course and construction of bituminous and cement concrete type, the presence of flaky and elongated particles are considered undesirable as they may cause inherent weakness with possibilities of breaking down under heavy loads. Flakiness and Elongation Index Test This test gives the percentage of flaky and elongate aggregate present in the total aggregate sample. It is not desirable to use flaky particles in construction of roads especially in surface course. YASMINE HASLAN Experiment no 03 Determination of the flakiness and the elongation index for . TEST DESCRIPTION: (Separate test can be conducted on each range of Sieve). The flakiness & elongation index test is connected as thickness gauge and length gauge respectively. Maximum permitted Elongated index is 35, 40 or 45% for aggregate sizes 2 '' - 2'', 1 '' - '' & '' - 3/8''. 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. 55. Read More: Abrasion Test on Aggregate (Los Angeles Test). The flat and elongated particle test is used to determine the dimensional ratios for aggregate particles of specific sieve sizes. The flakiness index is defined as the percentage (by mass) of stones in an aggregate having an ALD of less than 0.6 times their average dimension. Elongation index is a aggregate that have length more than 1.8 sieve size. Generally, this test is performed in accordance with AASHTO T 96 or ASTM C 131. The consent submitted will only be used for data processing originating from this website. Separation of Elongated Material- Each fraction shall be gauged individually for length on a metal . Special care must be taken that no outer air enters when using the balance. We can calculate the elongation index as follows: Here, W1 refers to the weight of particles that are retained in the length gauge, and W2 refers to the weight of the total sample used for the test. Flakiness Index and Elongation Index Test on Coarse Aggregates. The Flakiness Index is the total weight of the material passing the various thickness gauges or sieves, expressed as a percentage of the total weight of the sample gauged. FLAKINESS INDEX TXDOT DESIGNATION: TEX-224-F MATERIALS AND TESTS DIVISION 2 - 3 EFFECTIVE DATE: APRIL 2022 Figure 1Flakiness Index Metal Gauge Plate. AIM OF THE EXPERIMENT: Starting at $7.00. . Prepare aggregate sample for the test by sieving between IS sieve 6.3 mm size at the bottom and 63 mm IS sieve at top. This will cause the increase of void in the mix. What is the difference between flakiness index and elongation index? This the reason of the test being carried out. What is the difference between flakiness index and elongation index? RELEVANCE AND IMPORTANCE Definition of Flakiness 3.0 Apparatus a. ASTM D 5731-95; Standart Test Method for Determination of the Point Load Strength Index of Rock. Aggregate Testing Equipment Air Entrainment Meter and. Figure 1 Flakiness Index: It is the percentage by weight of flaky particles in a sample. This test gives the percentage of flaky and elongate aggregate present in the total aggregate sample. their thickness is less than 0.6 of their nominal size. Flakiness and Elongation PCTE. The elongation test is not applicable to material passing 6.30 mm sieve or retained 50mm sieve. Try to pass the aggregate width-wise through the slot of 10mm to 6.3 mm on a flakiness gauge. Terms of Use and Privacy Policy: Legal. Aggregate Shape Test to find Flakiness Index Elongation Index and Angularity Number. The width of appropriate slot would be 0.6 times the average of the range of sizes. Flakiness And Elongation Index Properties and Testing of. CODE OF REFERENCE: . Checking Elongation Checking Flatness 5. Reaffirmed Dec 2016 As a consequence, flaky particles require less amount of binders. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. In order to resist abrasion, the aggregate should have an adequate abrasion value. Flakiness Index = weight of aggregate retained on length gauge of 10 mm to 6.3 mm (W2) / Total weight of aggregate sample taken (W1), For example, the Weight of aggregate retained on length gauge of 10 mm to 6.3mm(W2) = 150 gm, and Total weight of aggregate sample = 1000 gm, Elongation Index = (150 gm / 1000 gm) x 100 = 15%, Read More: Aggregate Testing | 7 Test On Aggregates | Coarse Aggregate Test. For more information on Flakiness & Elongation of Aggregate, here are our related blogs: Copyright 2022 GlobalGilson.com. Hence we offer thickness gauge and length gauge to check flakiness and elongation index of the aggregate respectively. ASTM International: West Conshohocken, PA, USA, 1995. Proportional Calipers. The flakiness index and elongation index are two important types of indices useful in determining the concentration of a given sample by means of the particles that are present in the sample. Manage Settings Elongation index in excess of 10 to 15 % is generally considered undesirable. The below infographic presents the differences between flakiness index and elongation index in tabular form for side by side comparison, Difference Between Absorptivity and Molar Absorptivity, Difference Between Ilmenite and Perovskite, Difference Between Calcination and Pyrolysis, What is the Difference Between Lithium Orotate and Lithium Carbonate, What is the Difference Between Iron Sulfate and Iron Gluconate. The flakiness indices of TP1 and TP5 exceed the specified limit of 25% after BS 812 Part 105.1 (BS,1989), whereas the elongation indices of all the samples except TP6 exceed the limit (<25%) of . 6. This research tests energy optimised furnace (EOF) steel slag as substitution for natural coarse aggregate in concrete. A metal gauge plate Minimum 200 pieces of any fraction are taken and weighed properly. Given sample of aggregates to be tested is sieved through a set of sieves and separated into specified ranges of size. Moreover, flaky aggregates tend to produce seals having less amount of voids due to their tendency to pack tightly compared to cubical aggregates. A separate sample retains on this slot and weighted it(W2). With a mind rooted firmly to basic principals of chemistry and passion for ever evolving field of industrial chemistry, she is keenly interested to be a true companion for those who seek knowledge in the subject of chemistry. Sieves of sizes 63, 50, 40, 31.5,25, 20, 16, 12.5, 10 and 6.3 mm. Close suggestions Search Search 45 mm. ASTM D 4791 GLOSSARY Flat and Elongated Particles of Aggregate - Those particles having a ratio of length to thickness . Thickness Gauge Length Gauge Laboratory Tests For Determination of Strength of Rocks, Different Types of Slabs Used in Construction and Their Uses, Advantages & Disadvantages, What is Wood | What is Timber | Difference between Wood and Timber, Gable Roof Types, Advantages And Disadvantages, Stone Masonry Materials, Uses and Classifications, Difference between Spiral Column and Tied Column, Different Types of Plywood and their Grades & Benefits, New Rule and Regulations Affecting Construction, Civil Engineering Notes From Universities, Free Civil Engineering Magazines and White Papers, Civil Engineering Portal Biggest Civil Engineering Information Sharing Website, Bituminous Surface Dressing (Single Coat, Double Coat & Precoated). The percentage of flaky aggregate in the range of 10 mm to 6.3 mm is 20%. After the end of test, sieve should be cleaned by smooth brush. 5. The Flakiness index of aggregates is the percentage by weight of particles whose least dimension (thickness) is less than three- fifths (0.6times) of their mean dimension. An aggregate is said to be flaky if its least lateral dimension is less than 0.6 times the mean dimension. Flakines index define by separated the flaky particles and expressing their mass as a percentage of the mass of the sample test. It is important to keep the amount of flaky and elongated aggregate within permissible levels. Test aggregates must be sieved using sieves with openings of 63, 50, 37.5, 28, 20, 14, 10, and 6.3mm. These are available as 200mm diameter brass frame sieves with stainless steel cloth asISO Test Sieves. The samples passing through each sieve are then passed through the elongation gauge. 1. tures. 3 APPARATUS. COURTESY: GILSON, Fig 3: Set of Sieves. 1.1 This test method covers the determination of the percentages of flat particles, elongated particles, or flat and elongated particles in coarse aggregates. YASMINE HASLAN I cycle SHAMJITH KM 2386 1 Flakiness and Elongation Index Test for Aggregate Elongation Index is defined as the percentage of the weight of retained aggregate on different sets (sets which represent 7 gaps of different sizes) on elongation or length gauge to the total weight of aggregate sample for test. The elongation index can be described as the total weight of the material retained on the various length gauges that are expressed as a percentage of the total weight of the sample. Sayed Sajid H.Zidani Sieve test YASMINE HASLAN Softhening point REPORT DCC2042 YASMINE HASLAN Transportation Engineering Laboratory Manual BASWESHWAR JIRWANKAR DCC3113 DETERMINATION OF AGGREGATE IMPACT VALUE. Table 1 CCPW Materials Testing and Sampling Frequencies . This test is not applicable to sizes smaller than 6.3mm. In the calculation of the flakiness index of a sample of aggregates, we need to note the weight of each fraction of the aggregates that are passing through and retaining on the specific sieve we are using for the experiment. The Flakiness Index is the total weight of the material passing the various thickness gauges or sieves, expressed as a percentage of the total weight of the sample gauged. . In other words, this index value of aggregates gives the percentage by weight of aggregate particles having the least dimension that is less than 0.6 times their mean dimension. After, sieve analysis, physical properties include flakiness and elongation index, abrasion value, aggregate impact value and water absorption were carried out on, RCA, VA, and bitumen free RAP aggregates and compared with Ministry of Road Transport and Highways (MoRTH, 2013) [17] and tabulated in Table 1. sbm determination of aggregate crushing value lab reportAggregate impact and crushing test LinkedIn SlideShare Feb 08,2012 Flakiness index is the percentage of stones in an aggregate consisting of an average least dimension less than 0.6 times the average dimension of stones. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page. RELATEDTHEORY: SHAPES OF PARTICLES Elongation index is the total weight of the material retained on the various length gauges that are expressed as a percentage of the total weight of the sample is gauged. 4.1 Sieved sample with sieves mentioned in Table 1. LoginAsk is here to help you access Aggregate Sampling Equipment quickly and handle each specific case you encounter. FLAKINESS AND ELONGATION INDEX SIEVES SHAKERS EFFLUX INDEX APPARATUS ABRASION MACHINES SKID RESISTANCE AND FRICTION TESTER AGGREGATE IMPACT VALUE APPARATUS FILLER COMPACTION APPARATUS CRUSHING MOHS HARDNESS SCALE MOISTURE CONTENT ROCK MECHANICS PARTICLE SHAPE ACCELERATED POLISHING MACHINE OTHER EQUIPMENT FOR AGGREGATES AND SOIL Awarded as the best online publication by CIDC. CALCULATION ASTM 4791-10: Standard Test Method for Flat Particles, Elongated Particles or Flat Elongated Particles in Coarse Aggregates, American Society for Testing and Materials. The flakiness index of an aggregate sample is found by separating the flaky particles and expressing their mass as a percentage of the mass of the sample tested. The tolerance of dimensions shall be 0.2 mm for dimensions equal to or more than 50 mm and 0.1 mm for dimensions less than 50 mm. The Flakiness (Thickness) Gauge is used to determine if the aggregate particles are to be considered as flaky, i.e. The presence of elongated aggregate particles in a mixture can disturb the packing of particles and also creates more space. PRECAUTIONS The test does not apply to sizes smaller than 6.3 mm. An aggregate is said to be elongated if its largest lateral dimension is greater than 1.8 times the mean dimension. The key difference between flakiness index and elongation index is that flakiness index determines the concentration of flaky particles in a sample, whereas the elongation index determines the concentration of elongated particles in a sample. The flakiness index can be described as the percentage of stones in an aggregate consisting of an ALD (Average Least Dimension) less than 0.6 times the average dimension of stones. As such the flakiness and elongation test must be carried out to determine the suitability of the material. Flakiness Elongation Index Test Procedure Getting Started In Electronics Beautiful Chut City Social Science Important Question For Sa1 . The balance used to measure the aggregate has sufficient capacity. Gilson Models HM-925 & HM-926. Aggregate related testing such as Sieve Analysis, Flakiness & Elongation, Specific gravity & water absorption, Loss Role and Responsibilities Description of soil and rock samples. B. The tests were LA abrasion, soundness, flakiness index, elongation index, specific gravity, and water . The below infographic presents the differences between flakiness index and elongation index in tabular form for side by side comparison. APPARATUS REQUIRED: Your email address will not be published. Its accuracy is 0.1% of the weight of the test sample. Then the flakiness index is calculated as the total weight of material passed through various thickness gauges, expressed as a percentage of total weight of the sample gauged. Therefore, Flakiness Index= [w/W] x 100%. The flaky material passing the appropriate slot from each size range of test aggregates are added and then weighed.