What was the elongation index of the aggregates tested?
TEST DESCRIPTION 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. This test is also applicable to aggregates having size larger than 6.3 mm.
What is the range of elongation index?
The Elongation index of aggregate is the % by weight of the particles (aggregates) whose length is greater than 1 and 4/5th (1.8 times) of their mean dimension.”
What is the flakiness and elongation index of an 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 Elongation index of coarse aggregate?
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.
Why do we determine the 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.
How does elongation index affect construction?
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 the purpose of elongation test?
Elongation is important in manufacturing as it measures how much bending and shaping a material can withstand without breaking. Elongation is inversely proportional to hardness, tensile strength, and modulus. The greater a material’s hardness, tensile strength, and modulus, the less it will elongate under stress.
What is the unit for elongation?
Units & Values Because elongation is equal to the failure strain it has no units, but is often given in % strain.