(roundness, sphericity), angularity, flatness and elongation, flakiness, volume and surface area. The laser device has been evaluated for accuracy and repeatability (Anochie- Boateng et al, 2010). ... In South Africa, the standard test method used for the determination of flakiness index of coarse aggregates is contained in TMH1 Method …
Read definition, apparatus, IS code, procedure, observations, formula, result, lab report about flakiness and …
The flakiness index (in percent) is computed from the ratio of the mass of aggregate passing the gauge slots to total mass of aggregate retained on a specific sieve size …
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.
Thickness Gauge (Flakiness Index) is a slotted stainless steel gauge for rapid hand trying of particles from the seven sieve fractions to determine the flakiness index. Length Gauge (Elongation Index) has six labeled openings between metal pins for measuring the length of particles from each of the six sieve cuts below 50mm, for elongation index …
The Flakiness Index is determined by separating the flaky particles and expressing their mass as a percentage of the total mass of the sample. The test is not applicable to …
The apparatus shall be consisting of following:-Weight Balance (Digital balance):-Used for weighing the aggregate sample and It shall have an accuracy of 0.1 percent of the weight of the test sample.Elongation or Length gauge:-Used for passing different sizes of aggregate between different size ranges gaps on the gauge.Sieves sizes:- …
For obtaining the combined flakiness and elongation index, flakiness test is conducted; first and the non-flaky particles of the sample will be used for conducting elongation index. All dimensions are in millimeters Figure A. 2. Schematic of Elongation Index Gauge (IS:2386 (Part-I)-1963) A OBSERVATIONS. Table A Flakiness Index Test Results
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 +/- …
Aggregate shape is considered to be a key parameter for concrete and bituminous mixtures design. Generally, this parameter is determined by calculating a ratio between the different dimensions of the particles and by comparing this ratio to a flatness or elongation limit. The standardized methods used for this purpose vary among …
This test is applicable to aggregates having size larger than 6.3mm. To calculate the flakiness index of the given sample of aggregates, the weight of each fraction of aggregates passing and retaining on the specified set …
Flakiness index of aggregate test is conducted on coarse aggregates sample to estimate the shape of aggregates. For cement concrete types and base coarse and bituminous-construction, the presentence of flaky and elongated aggregate particles are considered undesirable as they may cause inherent weakness with possibility of …
Elongation index of an aggregate is the percentage by weight of particles whose greatest dimension (length) is greater than one and four-fifth times (1.8 times or 9/5 times) their mean dimension. It is measured on particles passing through mesh size of 63mm and retained on mesh size of 6.3mm.
Objective. Particle shape and surface texture influence the properties of freshly mixed concrete more than the properties of hardened concrete. Rough-textured, angular, and …
Determination of flakiness and elongation index for the given aggregate sample. - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. This lab report describes the whole procedure of determining flakiness and elomgation index of given aggregate sample.
This document describes procedures to determine the flakiness and elongation indices of aggregate samples according to BS-1241 test standards. It involves sieving the sample into different fractions and using gauges to measure the percentage of flaky and elongated particles in each fraction by weight. Flaky particles are those where the least dimension …
Thus the evaluation of the shape of the particles, particularly concerning flakiness, elongation is necessary. Flakiness Index. The flakiness index of aggregates is the percentages by weight of particles whose least …
3. Engr. Sayed Shajedul Hasan. SHAPES OF PARTICLES The usual shapes of the particles are; Rounded (river gravel) Flakiness and Elongation Index Flaky (laminated rock) Flakiness and …
Flakiness Index Vs Elongation Index The flakiness index measures the percentage of stones whose average minimum dimension is less than 0.6 times the mean dimension of the stones. In contrast, the elongation index gives an estimate of the total weight of a material placed on various length gauges, expressed as a percentage of the total weight …
After that to determine the flakiness index separate the aggregate retained in the sieve. Then pass each aggregate through the corresponding slot in the thickness gauge. Finally, we calculate the flakiness index. The flakiness index is the total weight of material passing through the gauge to the total weight of the sample.
Flakiness index (FI) and shape index (SI) were determined using two methods: in accordance with the European Standard and with the use of digital image analysis (reference method). Based on the obtained results it was found that there is an appropriate relationship between the European Standard method and the reference …
This paper describes the importance of the particle shape of aggregates in road structures, and their determination, especially using the flakiness index test. 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. ... Elongation index is ...
Therefore, it is necessary to evaluate the shape of particles, particularly with respect to flakiness and elongation. The Flakiness Index test determines the percentage by weight of particles whose least dimension (thickness) is less than three-fifths (0.6 times) of their mean dimension. This test is not applicable to particles smaller than 6.3mm.
In order to increase the rapidity and accuracy of aggregate shape determination, a model based on a two-dimensional image analysis approach has been developed and implemented in the French VDG 40 ...
METHODS FOR DETERMINATION OF PARTICLE SHAPE. SECTION 105.1: FLAKINESS INDEX. This section of BS 812 describes the method 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. The flakiness index of an aggregate sample is …
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 & HM-926 OPERATING MANUAL Rev: 01/2019
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. Flakiness and elongation tests are not applicable to sizes smaller than 6.3mm. Test procedure: