Which test measures the elongation index of road aggregates?
AIM OF THE EXPERIMENT: To determine the Flakiness Index of the given sample of course aggregate. ASTM 4791-10: Standard Test Method for Flat Particles, Elongated Particles or Flat Elongated Particles in Coarse Aggregates, American Society for Testing and Materials.
What is the use of elongation index?
This test is used to determine the particle shape of the aggregate and each particle shape being preferred under specific conditions. The significance of flakiness & elongation index is as follows; The degree of packing of the particles of one size depends upon their shape.
What is elongation and flakiness index of aggregate?
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. The Elongation Index of aggregates is the percentage by weight of particles whose greatest dimension (length) is greater than 1.8 times their mean dimension.
What is impact test of aggregate?
The aggregate impact test value is a measure of resistance to sudden impact or shock, which may vary from its resistance to gradually applied compressive load.
What is abrasion test of aggregate?
Abrasion test is carried out to test the hardness property of aggregates. The principle of Los Angeles abrasion test is to find the percentage wear due to relative rubbing action between the aggregate and steel balls used as abrasive charge.
Is code for Elongation index of coarse aggregate?
CODE OF REFERENCE: ASTM 4791-10: Standard Test Method for Flat Particles, Elongated Particles or Flat Elongated Particles in Coarse Aggregates, American Society for Testing and Materials.
What is elongation index in highway engineering?
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.
What should be the value of elongation index?
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. For road constructions elongation index should be less than 15%.
What do you infer from elongation test?
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. Flaky and elongated particles may have adverse effects on concrete and bituminous mix.
What is flakiness index of coarse aggregate?
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.
