Flakiness and Elongation Index of Aggregates Test | Civil Engineering (CE) | GATE & ESE 2023 Exam
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- Опубліковано 19 лис 2022
- In this free Sunday ka Funda session, BYJU'S Exam Prep GATE expert Satyajeet Sir will demonstrate the "Flakiness and Elongation Index of Aggregates Test" for the GATE 2023 & UPSC ESE (IES) Prelims Civil Engineering (CE) 2023 Exam aspirants in Hindi.
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Thanks a lot for this wonderful session Sir, ek hi video me poora topic cover ho gaya.
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I'm from 🇧🇩.
Thanks for video.
Good explanation
Thnq sir for this wonderful session about flaky and elongation index with practical experience for better understanding..💐💐💐💐💐💐💐💐
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Thank you sir for class with lab orientation
Thankyou sir for this valuable lesson about flaky and elongated index with practical knowledge no one can do this sir thank you sir❤
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Thanks a lot sir, it was an excellent class.
Expecting more such videos🙏
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Summary on flakiness and elongated index of aggregate:
Flakiness index calculated based on the thickness of an aggregate passes through a thickness gauge.
If the thickness of aggregate is less than 0.6 times of mean size of aggregate then it is under flakiness aggregate.
Whereas, elongated aggregate is based on lengthwise whose size is morethan 1.8 times of mean size of aggregate.
The aggregate which are not pass through thickness gauge is used in elongated aggregate.
Thank you for the beautiful session sir..
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Best explanation on UA-cam
Glad you think so!
Summary: Flakiness and Elongation Index
It is an experiment conducted on coarse aggregates.
Flakiness Index:
An aggregate is classified as flaky if its thickness is less than 0.6 times of the mean size
The sample of aggregate is taken and Sieve analysis is done (Sieve size ranges from 63 mm to 6.3 mm)
Then the aggregate retained on each sieve is passed through the respective thickness gauge slot.
If the aggregate passes the respective slot then it indicates that its size is less than 0.6 times the mean size which again indicates that the aggregate is flaky.
Like this, each aggregate is passed through the respective thickness gauge slots.
Flakiness Index =
(Weight of the material passing through the various thickness gauge slots) ÷ (Total weight of the sample)
Elongation Index:
An aggregate is called elongated if its length is more than 1.8 times its mean dimension.
Once the Flakiness test is done, the flaky aggregates are separated and on the remaining non flaky aggregates the Elongation Index experiment is carried on.
Sieve analysis is done for the sample(excluding the flaky one) ( size of the sieve ranges from 50 mm to 6.3 mm)
Each aggregate is passed through the respective slots of length gauge and the aggregate which wont pass through the slot is categorized as elongated aggregate, it indicates that its size is more than 1.8 times the mean size.
Elongation Index = (Weight of the material retained on the various length gauge slots) ÷ (Total weight of the sample)
Combined Index = Elongation Index + Flakiness Index
Thanks a lot sir
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Flakiness test and elongation tests: conducted on coarse aggregates.
Flakiness test:
1. Sample of aggregates taken, Sieve analysis is done.
2. Passing of the aggregates (which are retained on sieve) through respective thickness gauge slot.
3. Thickness of the selected aggregates < 0.6 d mean
So, Can say, Thickness gauge slot size: 0.6 d mean
4. Flakiness index = ( Weight of passed aggregates through thickness gauge slot / Total weight of sample ) × 100
Elongation test:
1. Non-passed aggregates from flakiness test are further passed through length gauge.
2. Length of the aggregates > 1.8 d mean
3. So, can say, Length gauge slot size: 1.8 d mean
4. Elongation index = ( Weight of non-passed aggregates through length gauge slot / Total weight ) × 100
Combined Index: Flakiness Index + Elongation Index
Facts are picturized in very interesting manner. Superb teaching sir👌
Thank you very much
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At least provide complete information....u have not mentioned permissible values of FI and EI