Table of Contents
- 1 What is Elongation index of coarse aggregate?
- 2 What is elongation index?
- 3 How do you find the aggregate elongation index?
- 4 What was the elongation index of the aggregates tested?
- 5 Which apparatus is used for determination of elongation index of aggregates Mcq?
- 6 What do you mean by elongation index of an aggregate how the elongation index of the sample helps in deciding the design of a highway?
- 7 How to calculate elongation index of aggregate?
- 8 What is the equivalent length index test for coarse aggregates?
What is Elongation index of coarse aggregate?
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 elongation index?
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.
Which apparatus is used for determination of elongation index?
Elongation Gauge
Elongation Gauge: Used for determination of elongation index of aggregates. It consists of a steel frame having slots of different dimensions.
What is the formula for flakiness and elongation index?
Determination Of Indices (Flakiness And Elongation)
| IS Sieve size in mm | |
|---|---|
| 1. Flakiness Index ( C/A ) × 100 = \% | |
| 2. Elongation Index ( D/B ) × 100 = \% | |
| 3. Combined F1 & E1 ( 1+2 ) = \% | |
| Specified Limits: | For road works 30\% ( Max.) & For concrete work 25\% ( Max. ) |
How do you find the aggregate elongation index?
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.
What was the elongation index of the aggregates tested?
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.
How do you measure elongation index?
The elongation index test procedure contains following steps.
- Take the aggregate sample which contains minimum 200 pieces of any fraction.
- Sieve the sample through mentioned sieves i.e., from 63mm to 6.3mm sieves.
- The aggregate retained on 63mm and passed through 6.3mm should not be considered.
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; Due to high surface area to volume ratio, the flaky and elongated particles lower the workability of concrete mixes.
Which apparatus is used for determination of elongation index of aggregates Mcq?
AIM: To determination of Flakiness Index and Elongation Index of Course Aggregates. Apparatus: Standard thickness gauge.
What do you mean by elongation index of an aggregate how the elongation index of the sample helps in deciding the design of a highway?
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\%.
How do you determine elongation?
Elongation is calculated by dividing the distance travelled by the original gauge length.
How to calculate elongation index of aggregate?
To calculate the Elongation Index of the entire sample of aggregates, the weight of aggregates which is retained on the specified gauge length from each fraction is noted. As an example, Let 200 pieces of the aggregate passing 40 mm sieve and retained on 25 mm sieve weight W1 gram.
What is the equivalent length index test for coarse aggregates?
Elongation Index Test on Coarse Aggreagtes. 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.
What is electelongation Index test of aggregate?
Elongation index Test of aggregate is conducted on coarse aggregates sample to estimate the shape of aggregates.
What are the sieves of elongation Index test?
Test sieves of sizes – 63mm, 50mm, 40mm, 31.5mm, 25mm, 20mm, 16mm, 10mm and 6.3mm. The elongation index test procedure contains following steps. Take the aggregate sample which contains minimum 200 pieces of any fraction. Sieve the sample through mentioned sieves i.e., from 63mm to 6.3mm sieves.