What is flakiness index of coarse aggregate?
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. Flaky aggregates tend to produce seals with less voids due to their tendency to pack more tightly than cubical aggregates, consequently flaky particles require less binder.
How do you find the flakiness index of aggregate?
6. calculation
- The Flakiness Index on an aggregate is = Total weight passing Flakiness Gauge x 100 / Total weight of test sample =_________(%)
- The Elongation Index on an aggregate is = Total weight retained on Elongation Gauge x 100 / Total weight of test sample =________(%)
What is flakiness and elongation index?
Flakiness Index is the percentage by weight of particles in it, whose least dimension (i.e. thickness) is less than three-fifths of its mean dimension. 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.
For what size of the aggregate flakiness index test is not suitable?
6.3 mm
The flakiness index of an aggregate is the percentage by weight of particles in it whose least dimension is less than 0.60 times their mean dimension. This test is not applicable to a size less than 6.3 mm.
Why flakiness index test is done?
The test Flakiness index of aggregate is used to determine the particle shape of the aggregate specimen and each particle shape being preferred under specific condition.
Why do we determine flakiness index?
What’s flakiness mean?
Definition of flakiness (Entry 2 of 2) 1 : lack of reliability : the tendency to behave or perform undependably Mobile phones make it all too easy to cancel plans at the last minute, but social flakiness isn’t a recipe for health and happiness—or good for our relationships.—
Where is the flakiness test used?
This method uses to measure the Flakiness Index and Elongation index of aggregate use in the construction of Highway pavement and concrete structures.
What is test flakiness?
The Science Of Flaky Tests # A flaky test is one that fails to produce the same result each time the same analysis is run. The build will fail only occasionally: One time it will pass, another time fail, the next time pass again, without any changes to the build having been made.
Where does flakiness come from?
Flakiness comes from the solid fat (butter, shortening, lard, or cream cheese) that’s used to make the dough. The fat is mixed or “cut” into the flour so it stays in discernible pieces. During baking, the pieces of fat melt away, leaving air pockets that then expand a little from steam.
What is the meaning of flakiness?
What is the flakiness?
Noun. 1. flakiness – informal terms for insanity. craziness, daftness. insanity – relatively permanent disorder of the mind.
What is flakiness index of aggregates?
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. The test does not apply to sizes smaller than 6.3 mm.
What is flakiness and elongation Index test?
Flakiness and Elongation Index Test are very important tests to be performed on aggregate in the laboratory. This test gives the percentage of flaky and elongate aggregate present in the total aggregate sample.
Is the elongation Index test applicable to coarse aggregate?
This test is not applicable 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. This test is not applicable for sizes smaller than 6.3mm. Procedure of Shape Tests on Coarse Aggregates
What is the percentage of flaky aggregate in the range 10mm to 20%?
The percentage of flaky aggregate in the range of 10 mm to 6.3 mm is 20%. The Following is the procedure for elongation index, Try to pass the aggregate length wise through slot of 10mm to 6.3 mm on length gauge. Separate sample retain on this slot and weight it (W2). Note: Test can be conducted for each range of elongation gauge slot.